+3000 Questions: Biology and Science With Answer Key

May 29, 2025 Topics

+3000 Questions: Biology and Chemistry with Answer Key

Are you a high school student looking to improve your performance in biology? Or a teacher seeking quality practice questions for your students? Science LexiWiki is your go-to platform for multiple-choice (MCQs) biology questions, tailored specifically for high school education.

Introdution to Biology

Ads

Molecular Biology

Evolution

Molecular Biology

Genetics

Cell Biology

Ecology

Prokaryotes

Virus

Questions on Virus – Characteristics, Structure, Classification & Origin

Protists

Fungi

Kingdom Plantae

Animal Kingdom

Human Body

What You'll Find on Science LexiWiki:

• Thousands of Biology Multiple-Choice Questions

Practice with carefully selected MCQs covering all major topics: cell biology, genetics, evolution, ecology, human anatomy, botany, and more.

• Discursive Biology Questions with Model Answers

Prepare for open-ended exams with detailed discursive questions and suggested responses that train you to think critically and write scientifically.

• Topic-Based Practice

Search questions by subject or curriculum standard, including enzymes, DNA replication, photosynthesis, natural selection, and other core high school biology themes.

• Updated According to the Latest Educational Guidelines

All our content aligns with national and international biology curricula to ensure you're preparing with relevant and up-to-date materials.

• Ideal for Exams, Quizzes, and Study Plans

Whether you're preparing for school tests, entrance exams, or academic competitions, helps you practice effectively.

Why Choose Science LexiWiki?

• SEO-Friendly Interface: Find exactly what you need quickly, thanks to optimized search tags and categorized content.

• User-Friendly Design: Clean, easy navigation for both desktop and mobile.

• Comprehensive Coverage: From basic concepts to advanced topics, we’ve got every biology subject covered.

Perfect For:

• High school students

• Biology teachers

• Homeschoolers

• Competitive exam candidates

Boost Your Biology Grades Today!

Explore our growing library of biology multiple-choice and essay questions. Practice smarter, improve faster, and build the confidence you need to succeed in high school biology.

Start practicing now on Science LexiWiki – Biology Questions for Every Learner.

The Importance of Studying Biology in High School

Biology is one of the most important subjects in high school. It helps students understand the living world, their own bodies, and the complex interactions between organisms and the environment. On this page, you'll learn why studying biology in high school is essential for academic success, personal growth, and career development.

What Is Biology?

Biology is the science of life. It explores everything from the smallest cell to the largest ecosystems. Topics like genetics, evolution, human anatomy, microbiology, botany, and ecology help students understand how life works — from molecules to entire populations.

Why Is Biology Important in High School?

1. Foundation for Health and Medicine

Understanding biology helps students make informed decisions about their health. It lays the groundwork for future studies in medicine, nursing, biomedicine, pharmacy, and other health-related fields.

2. Environmental Awareness

Biology teaches students about the importance of biodiversity, conservation, climate change, and sustainable living — helping them become responsible global citizens.

3. Improved Scientific Thinking

Studying biology develops critical thinking, observation, analysis, and problem-solving skills, which are essential not just in science, but in all areas of life and learning.

4. Career Opportunities

A strong foundation in biology can lead to careers in research, biotechnology, agriculture, environmental science, genetics, and forensic science, among others.

5. Understanding Human Life

Biology helps students understand their own bodies, nutrition, diseases, reproduction, and overall functioning of living systems — essential knowledge for everyday life.

Biology and Academic Success

In many national exams and university entrance tests, biology is a core subject. Performing well in biology can increase chances of admission into competitive programs and scholarships. It’s also part of many STEM (Science, Technology, Engineering, and Mathematics) learning paths.

How to Make the Most of Biology Classes

• Use multiple-choice and discursive questions to test your understanding

• Connect biological concepts with real-life examples

• Stay updated on new discoveries in genetics, health, and ecology

• Practice regularly with topic-based exercises and past exam questions

Start Your Biology Journey Today

Biology isn’t just about memorizing facts — it’s about exploring life itself. Whether you want to become a doctor, a scientist, or simply understand the world better, studying biology in high school is a crucial first step.

Discover our practice questions, study guides, and educational resources to boost your biology knowledge and prepare for success.

How to Study for Biology Exams in High School: Best Tips and Strategies

Struggling with how to study for biology exams in high school? You're not alone. Biology is a content-rich subject that requires both memorization and understanding. Whether you're preparing for a unit test, a final exam, or a college entrance exam, having a smart study strategy can make all the difference.

In this guide, you'll find effective study tips for high school biology, along with tools and techniques to help you succeed.

Why Is Studying Biology Different?

Biology combines theory with terminology, processes, and visuals. You'll need to remember key facts, but also apply concepts to real-world scenarios. Topics like cell structure, genetics, photosynthesis, evolution, and human anatomy require both conceptual understanding and critical thinking.

Top Tips: How to Study for High School Biology Exams

1. Understand the Curriculum

Start by reviewing your syllabus or curriculum guidelines. Make a list of all the topics covered in the exam — from DNA replication to ecosystems — so you can track your progress.

2. Use Multiple-Choice and Discursive Questions

Practice with biology multiple-choice questions (MCQs) to test your recall and speed. Then deepen your understanding with discursive or essay-style questions that train you to explain biological concepts clearly.

Try our Biology Practice Questions to test yourself on real exam-style problems.

3. Study in Chunks, Not Marathons

Break your study time into focused sessions using techniques like the Pomodoro method. Study one topic at a time (e.g., mitosis today, genetics tomorrow) for better retention.

4. Create Visual Aids

Biology is full of diagrams, cycles, and processes. Use:

• Mind maps for connections between topics

• Flowcharts for processes like the carbon cycle

• Labeled diagrams for structures like the heart or plant cells

5. Use Flashcards for Key Terms

Create flashcards (physical or digital) for definitions and key terms. For example:

• Osmosis

• Homeostasis

• Allele

• Photosynthesis equation

Apps like Anki or Quizlet are great for this.

6. Teach What You Learn

Explaining a biology concept to a friend, family member, or even out loud to yourself is one of the best ways to reinforce learning.

7. Take Practice Tests Under Exam Conditions

Simulate real test environments by timing yourself. This builds confidence and reduces anxiety during the actual biology exam.

Bonus Tips for Biology Success

• Review past exam papers and look for patterns in question types.

• Don’t just memorize — focus on why and how things happen in biology.

• Keep a study schedule and stick to it.

• Join a study group or online forum to ask questions and share ideas.

Get Exam-Ready

Looking for high-quality biology exam practice? At , we provide:

• Topic-based multiple-choice and discursive questions

• Step-by-step answers and explanations

• Study resources aligned with high school biology standards

Start practicing now and improve your performance in biology — one question at a time.

Science Lexiwiki – Helping You Study Biology Smarter, Not Harder.

Main Areas of Biology: What They Are and What They Study

Biology is a vast and fascinating science that explores the living world, from microscopic cells to complex ecosystems. To understand life in all its forms, biology is divided into several specialized areas. Each one focuses on a specific aspect of life, making it easier to study the diversity, structure, and functions of organisms.

In this article, you’ll discover the main areas of biology, what they study, and why they are important — essential knowledge for every high school biology student.

1. Cell Biology (Cytology)

What it studies: The structure and function of cells, the basic unit of life.

Topics include:

• Cell organelles

• Cell division (mitosis and meiosis)

• Cellular respiration and photosynthesis

Why it matters: Understanding cells helps explain how life works on the smallest level and is essential for fields like medicine, genetics, and biotechnology.

2. Genetics

What it studies: Heredity, DNA, genes, and how traits are passed from one generation to the next.

Topics include:

• Mendelian genetics

• DNA structure and replication

• Mutations and genetic engineering

Why it matters: Genetics is at the heart of modern biology, including genetic testing, cloning, and CRISPR gene editing.

3. Anatomy and Physiology

What it studies: The structure (anatomy) and functioning (physiology) of living organisms, especially humans and animals.

Topics include:

• Human body systems (nervous, circulatory, digestive, etc.)

• Organs and tissues

• Homeostasis and body regulation

Why it matters: Essential for understanding health, diseases, and how the human body works.

4. Ecology

What it studies: The relationships between organisms and their environment.

Topics include:

• Food chains and food webs

• Biomes and ecosystems

• Biodiversity and environmental impact

Why it matters: Ecology helps us address issues like climate change, deforestation, and conservation.

5. Microbiology

What it studies: Microscopic organisms such as bacteria, viruses, fungi, and protists.

Topics include:

• Pathogens and infections

• Immune response

• Antibiotics and vaccines

Why it matters: Microbiology is key to medicine, food safety, and biotechnology.

6. Botany

What it studies: The biology of plants.

Topics include:

• Plant structure and reproduction

• Photosynthesis

• Plant classification and ecology

Why it matters: Plants are vital for life on Earth, producing oxygen and food, and playing a key role in ecosystems.

7. Zoology

What it studies: The biology of animals.

Topics include:

• Animal behavior and physiology

• Evolution and adaptation

• Animal classification (taxonomy)

Why it matters: Zoology helps us understand animal life, biodiversity, and how to protect endangered species.

8. Evolutionary Biology

What it studies: The origin and development of species over time.

Topics include:

• Natural selection

• Fossil records

• Evolutionary trees and common ancestry

Why it matters: Explains the diversity of life and the processes that shape living organisms.

9. Biotechnology

What it studies: The use of biological processes and organisms in technology and industry.

Topics include:

• Genetic engineering

• Cloning

• Biopharmaceuticals and biofuels

Why it matters: Biotechnology is revolutionizing medicine, agriculture, and environmental science.

Why Learn the Areas of Biology in High School?

Understanding the main branches of biology helps students:

• Build a strong foundation for exams and college entrance tests

• Discover career paths in health, science, and environmental fields

• Connect biological theory to real-world applications

Questions: Biology and Science With Answer Key

Explore More

Want to test your knowledge of biology? On BioMaster, you’ll find:

• Topic-based multiple-choice questions and essay prompts

• Study guides for each area of biology

• Resources aligned with high school biology standards

Questions About Sexually Transmitted Infections (STIs)

May 27, 2025 Human Body

Questions About Sexually Transmitted Infections (STIs)

Multiple-Choice Questions

Topic: STIs – General, Bacterial, and Viral

1. What does STI stand for?

A) Sterile Tissue Infection

B) Sexually Transmitted Infection

C) Standard Test Infection

D) Sexually Treated Illness

E) Systemic Tissue Illness

Ads

2. Which of the following is a bacterial STI?

A) Genital herpes

B) Syphilis

C) HIV

D) HPV

E) Hepatitis B

3. Which virus causes AIDS?

A) HPV

B) HSV

C) HIV

D) HCV

E) CMV

4. What is a common symptom of chlamydia?

A) Always noticeable pain

B) No symptoms in most cases

C) Jaundice

D) Skin rash only

E) Warts

5. Which STI is known for causing genital warts?

A) HIV

B) Chlamydia

C) Gonorrhea

D) HPV

E) Syphilis

6. Which of the following is an incurable viral STI?

A) Gonorrhea

B) Syphilis

C) Chlamydia

D) Herpes

E) Trichomoniasis

7. What is the primary mode of STI transmission?

A) Sharing food

B) Airborne particles

C) Blood transfusion

D) Sexual contact

E) Sneezing

8. Which bacterial STI can be treated with penicillin?

A) HIV

B) HPV

C) Syphilis

D) Hepatitis B

E) Herpes

9. Which STI can progress through primary, secondary, latent, and tertiary stages?

A) HPV

B) Gonorrhea

C) Syphilis

D) Chlamydia

E) Hepatitis C

10. Which STI is often called “the clap”?

A) Chlamydia

B) Trichomoniasis

C) HIV

D) Syphilis

E) Gonorrhea

11. Which of the following STIs is caused by a protozoan?

A) Syphilis

B) HPV

C) Trichomoniasis

D) Herpes

E) HIV

12. Which STI has a vaccine available for prevention?

A) HIV

B) Gonorrhea

C) Herpes

D) HPV

E) Syphilis

13. What is a major symptom of genital herpes?

A) White discharge

B) Painless ulcers

C) Genital blisters

D) Abdominal swelling

E) Warts

14. Untreated chlamydia in women can lead to:

A) Liver failure

B) Pelvic inflammatory disease

C) Neurological damage

D) Heart disease

E) Skin ulcers

15. What type of pathogen causes gonorrhea?

A) Virus

B) Bacteria

C) Fungus

D) Protozoan

E) Prion

16. Hepatitis B can be classified as:

A) Bacterial STI

B) Fungal STI

C) Protozoan STI

D) Viral STI

E) Parasitic STI

17. What is a serious long-term complication of HPV infection?

A) Kidney stones

B) Cervical cancer

C) Infertility

D) Lung infection

E) Heart disease

18. What is a distinguishing feature of secondary syphilis?

A) Genital sores

B) Flu-like symptoms

C) Painless skin rash

D) Memory loss

E) Chronic fatigue

19. The herpes simplex virus type 2 (HSV-2) is commonly associated with:

A) Oral herpes

B) Liver inflammation

C) Genital herpes

D) Eye infections

E) Cervical cancer

20. Which of the following can be transmitted from mother to baby during childbirth?

A) Chlamydia

B) Gonorrhea

C) Herpes

D) All of the above

E) None of the above

21. HIV primarily attacks which type of cells?

A) Red blood cells

B) Platelets

C) CD4 T-cells

D) Liver cells

E) Neurons

22. What does HPV stand for?

A) Human Placental Virus

B) Human Parasite Vector

C) Human Papillomavirus

D) Hepatitis Papule Virus

E) Human Pathogen Variant

23. Which STI often shows no symptoms but can lead to infertility?

A) Chlamydia

B) HPV

C) Herpes

D) HIV

E) Syphilis

24. Condoms are most effective in preventing which types of STIs?

A) All STIs

B) STIs spread by skin contact only

C) Bacterial STIs

D) Bloodborne STIs only

E) STIs spread through air

25. Which STI has a characteristic painless sore (chancre) in its primary stage?

A) Gonorrhea

B) Chlamydia

C) Syphilis

D) HPV

E) Herpes

26. HIV can be transmitted through:

A) Hugging

B) Mosquito bites

C) Sharing toilets

D) Blood, semen, vaginal fluids, breast milk

E) Sneezing

27. The presence of which marker is used to diagnose HIV?

A) CD8 count

B) Antibodies against HIV

C) Insulin level

D) White blood cells

E) Antibodies against HPV

28. Which STI is linked to liver damage and jaundice?

A) Syphilis

B) Gonorrhea

C) Hepatitis B

D) Chlamydia

E) Trichomoniasis

29. What is the best way to prevent all types of STIs?

A) Oral antibiotics

B) Avoiding public toilets

C) Abstinence or safe sex practices

D) Getting vaccinated

E) Daily exercise

30. Which of the following is true about viral STIs?

A) They can be easily cured with antibiotics

B) They never cause symptoms

C) They cannot be transmitted through oral sex

D) They are often incurable but manageable

E) They cause only skin infections

Questions About Sexually Transmitted Infections (STIs)

Answers and Explanations

1. B – STI stands for Sexually Transmitted Infection.

2. B – Syphilis is a bacterial STI caused by Treponema pallidum.

3. C – HIV (Human Immunodeficiency Virus) causes AIDS.

4. B – Chlamydia often shows no symptoms, especially in women.

5. D – HPV (Human Papillomavirus) causes genital warts.

6. D – Herpes (HSV) is a viral STI with no cure.

7. D – Sexual contact is the main route of STI transmission.

8. C – Syphilis is treated with penicillin.

9. C – Syphilis progresses through multiple clinical stages.

10. E – Gonorrhea is commonly called “the clap.”

11. C – Trichomoniasis is caused by a protozoan (Trichomonas vaginalis).

12. D – HPV has a vaccine (e.g., Gardasil) for prevention.

13. C – Herpes causes painful genital blisters.

14. B – Untreated chlamydia can cause pelvic inflammatory disease.

15. B – Gonorrhea is caused by a bacterium (Neisseria gonorrhoeae).

16. D – Hepatitis B is a viral infection affecting the liver.

17. B – HPV is strongly linked to cervical cancer.

18. C – A painless rash is a sign of secondary syphilis.

19. C – HSV-2 usually causes genital herpes.

20. D – All of the listed infections can be transmitted during childbirth.

21. C – HIV attacks CD4 T-cells, weakening the immune system.

22. C – HPV stands for Human Papillomavirus.

23. A – Chlamydia is often asymptomatic and can lead to infertility.

24. C – Condoms are highly effective against bacterial STIs.

25. C – A chancre (painless sore) is the hallmark of primary syphilis.

26. D – HIV spreads through specific body fluids, not casual contact.

27. B – HIV is diagnosed by detecting antibodies against the virus.

28. C – Hepatitis B affects the liver and causes jaundice.

29. C – Abstinence and safe sex are key to STI prevention.

30. D – Viral STIs are often incurable but can be managed with treatment

Questions About Embryology: Fertilization, Growth, Placenta, and Pregnancy

May 27, 2025 Human Body

Questions About Embryology: Fertilization, Growth, Placenta, and Pregnancy

Multiple-Choice Questions

Topic: Embryology – Fertilization, Growth, Placenta, Pregnancy

1. Where does fertilization typically occur in humans?

A) Uterus

B) Cervix

C) Vagina

D) Fallopian tube

E) Ovary

Ads

2. What is the result of the fusion of a sperm and an egg?

A) Embryo

B) Morula

C) Blastocyst

D) Zygote

E) Placenta

3. What structure forms after the zygote divides several times?

A) Ovum

B) Embryo

C) Morula

D) Placenta

E) Follicle

4. What is the name of the hollow ball of cells that implants into the uterus?

A) Blastula

B) Zygote

C) Morula

D) Gastrula

E) Blastocyst

5. Which hormone is detected in pregnancy tests?

A) Estrogen

B) Progesterone

C) Oxytocin

D) hCG

E) LH

6. What is the function of the placenta?

A) Digestion of food

B) Hormone production only

C) Waste elimination only

D) Nourishment and waste exchange between mother and fetus

E) Gas exchange in the mother

7. What does the umbilical cord connect?

A) Mother to ovary

B) Fetus to uterine wall

C) Fetus to placenta

D) Placenta to uterus

E) Embryo to cervix

8. When does implantation occur after fertilization?

A) Immediately

B) 12 hours later

C) 24 hours later

D) 6–7 days later

E) 2 weeks later

9. What is the outer layer of the blastocyst called?

A) Endoderm

B) Trophoblast

C) Ectoderm

D) Chorion

E) Zona pellucida

10. Which layer of the embryo forms the nervous system?

A) Endoderm

B) Mesoderm

C) Ectoderm

D) Trophoblast

E) Morula

11. Which germ layer gives rise to muscles and bones?

A) Endoderm

B) Mesoderm

C) Ectoderm

D) Blastoderm

E) Trophoblast

12. What does the endoderm primarily develop into?

A) Skin and hair

B) Muscles and bones

C) Lungs and digestive organs

D) Brain and spinal cord

E) Heart and kidneys

13. When is an embryo officially considered a fetus?

A) After 1 week

B) After 2 weeks

C) After 4 weeks

D) After 8 weeks

E) After 12 weeks

14. What is the role of amniotic fluid?

A) Nourishes the fetus

B) Helps fetal respiration

C) Cushions and protects the fetus

D) Removes waste

E) Forms bones

15. What hormone maintains the uterine lining in early pregnancy?

A) Estrogen

B) LH

C) Oxytocin

D) hCG

E) FSH

16. How long does human pregnancy typically last?

A) 30 weeks

B) 32 weeks

C) 36 weeks

D) 38 weeks

E) 40 weeks

17. Which structure prevents polyspermy (entry of multiple sperm)?

A) Chorion

B) Zona pellucida

C) Umbilical cord

D) Trophoblast

E) Placenta

18. What initiates labor contractions?

A) Estrogen

B) FSH

C) Oxytocin

D) Progesterone

E) LH

19. What structure is expelled after the baby is delivered?

A) Embryo

B) Morula

C) Placenta

D) Umbilical cord

E) Blastocyst

20. Which hormone promotes milk ejection?

A) Progesterone

B) Oxytocin

C) Prolactin

D) LH

E) Estrogen

21. What structure forms the fetal part of the placenta?

A) Chorion

B) Yolk sac

C) Amnion

D) Trophoblast

E) Uterus

22. Which embryonic membrane directly surrounds the embryo?

A) Amnion

B) Chorion

C) Yolk sac

D) Allantois

E) Placenta

23. When does organogenesis begin during development?

A) 1st week

B) 2nd week

C) 3rd week

D) 6th week

E) 10th week

24. What is the function of the yolk sac in humans?

A) Nutrition

B) Blood cell formation

C) Gas exchange

D) Hormone secretion

E) Digestion

25. Which of these structures is not derived from the mesoderm?

A) Heart

B) Muscles

C) Lungs

D) Kidneys

E) Skeleton

26. What does cleavage refer to in embryology?

A) Fertilization

B) Egg rupture

C) Mitotic division of the zygote

D) Implantation

E) Uterine contraction

27. What is the function of the chorionic villi?

A) Waste removal

B) Anchoring embryo to the uterus and nutrient exchange

C) Blood cell production

D) Gas storage

E) Hormone inhibition

28. Which of the following occurs during the first trimester?

A) Birth

B) Formation of organs

C) Weight gain

D) Contractions

E) Eyelid opening

29. Which hormone prepares the breasts for milk production?

A) LH

B) Oxytocin

C) Progesterone

D) Estrogen

E) Prolactin

30. What organ allows oxygen and nutrients to pass from mother to fetus?

A) Amnion

B) Chorion

C) Uterus

D) Placenta

E) Yolk sac

Questions About Embryology: Fertilization, Growth, Placenta, and Pregnancy

Answers and Explanations

1. D – Fertilization usually happens in the fallopian tube.

2. D – The zygote is the first cell formed from sperm and egg fusion.

3. C – A morula is the early solid ball of cells formed by zygote division.

4. E – The blastocyst is the hollow ball of cells that implants.

5. D – hCG (human chorionic gonadotropin) is detected in pregnancy tests.

6. D – The placenta facilitates nutrient and waste exchange.

7. C – The umbilical cord connects the fetus to the placenta.

8. D – Implantation typically occurs 6–7 days after fertilization.

9. B – The trophoblast is the outer layer of the blastocyst.

10. C – The ectoderm gives rise to the nervous system.

11. B – The mesoderm forms muscles, bones, and the circulatory system.

12. C – The endoderm develops into the digestive tract and lungs.

13. D – At 8 weeks, the embryo is classified as a fetus.

14. C – Amniotic fluid cushions the fetus from impact.

15. D – hCG maintains the corpus luteum to keep producing progesterone.

16. E – Pregnancy lasts about 40 weeks from the last menstrual period.

17. B – The zona pellucida prevents more than one sperm from entering.

18. C – Oxytocin stimulates uterine contractions during labor.

19. C – The placenta is expelled after birth as the “afterbirth.”

20. B – Oxytocin causes milk ejection; prolactin produces milk.

21. A – The chorion forms the fetal side of the placenta.

22. A – The amnion is the innermost membrane surrounding the embryo.

23. C – Organogenesis begins around the third week of development.

24. B – The yolk sac is important in early blood formation in humans.

25. C – The lungs derive from the endoderm, not the mesoderm.

26. C – Cleavage refers to early mitotic divisions of the zygote.

27. B – Chorionic villi anchor the embryo and allow exchange with the mother’s blood.

28. B – Major organ systems begin forming in the first trimester.

29. E – Prolactin prepares the mammary glands for milk production.

30. D – The placenta transfers oxygen and nutrients to the fetus.

Questions About the Female Reproductive: Organs, Egg Cells, and the Menstrual Cycle

May 27, 2025 Human Body

Questions About the Female Reproductive: Organs, Egg Cells, and the Menstrual Cycle

Multiple-Choice Questions

Topic: Female Reproductive Organs, Development, Egg Cells & Menstrual Cycle

1. What is the main function of the ovaries?

A) To support fetal development

B) To filter blood

C) To produce egg cells and hormones

D) To eliminate waste

E) To transport sperm

Ads

2. What hormone triggers ovulation?

A) FSH

B) Estrogen

C) Progesterone

D) LH

E) Oxytocin

3. Where does fertilization usually occur?

A) Ovary

B) Uterus

C) Vagina

D) Cervix

E) Fallopian tube

4. Which part of the female reproductive system houses a developing fetus?

A) Ovary

B) Cervix

C) Fallopian tube

D) Uterus

E) Vagina

5. Which hormone is primarily responsible for thickening the uterine lining?

A) Testosterone

B) Progesterone

C) LH

D) Oxytocin

E) Insulin

6. What structure connects the uterus to the outside of the body?

A) Urethra

B) Cervix

C) Fallopian tube

D) Vagina

E) Bladder

7. What is the function of the endometrium?

A) Hormone production

B) Protection of ovaries

C) Nutrient supply to fertilized egg

D) Mucus secretion

E) Formation of egg cells

8. During which phase of the menstrual cycle is the endometrium shed?

A) Ovulatory phase

B) Luteal phase

C) Proliferative phase

D) Menstrual phase

E) Fertile window

9. What is menarche?

A) First ovulation

B) Start of menopause

C) First menstrual period

D) End of puberty

E) Endometrial shedding

10. What hormone does the corpus luteum mainly produce?

A) FSH

B) LH

C) Progesterone

D) Estrogen

E) Oxytocin

11. Which of the following best describes ovulation?

A) Implantation of a fertilized egg

B) Maturation of the endometrium

C) Release of an egg from the ovary

D) Shedding of the uterine lining

E) Fetal development

12. What structure transports the egg from the ovary to the uterus?

A) Cervix

B) Urethra

C) Uterus

D) Fallopian tube

E) Vagina

13. Which hormone stimulates the growth of ovarian follicles?

A) LH

B) Oxytocin

C) FSH

D) Testosterone

E) Cortisol

14. What is the term for the cessation of the menstrual cycle?

A) Menarche

B) Fertility

C) Ovulation

D) Menopause

E) Puberty

15. What is the lifespan of an egg after ovulation if not fertilized?

A) 24–48 hours

B) 5–7 days

C) 2 weeks

D) 3–5 days

E) 1 hour

16. What is the average length of the menstrual cycle?

A) 14 days

B) 21 days

C) 28 days

D) 35 days

E) 7 days

17. What is the role of estrogen in the menstrual cycle?

A) Triggers ovulation

B) Maintains pregnancy

C) Promotes uterine contractions

D) Stimulates follicle growth and thickens endometrium

E) Suppresses FSH

18. What is the name of the mature egg cell?

A) Zygote

B) Follicle

C) Ovum

D) Embryo

E) Blastocyst

19. Which structure dilates during childbirth?

A) Ovary

B) Endometrium

C) Cervix

D) Fallopian tube

E) Urethra

20. What triggers menstruation if fertilization does not occur?

A) Increase in LH

B) Increase in estrogen

C) Drop in progesterone

D) Rise in oxytocin

E) Uterine contraction

21. What is the follicular phase?

A) Uterine lining is shed

B) Follicles develop in the ovaries

C) Corpus luteum breaks down

D) Implantation occurs

E) Ovulation happens

22. Which hormone increases sharply just before ovulation?

A) LH

B) Progesterone

C) Estrogen

D) FSH

E) Testosterone

23. What is the main function of the cervix?

A) Produces hormones

B) Produces egg cells

C) Pathway for sperm and childbirth

D) Nourishes fetus

E) Absorbs nutrients

24. The release of which hormone begins puberty in females?

A) Testosterone

B) Insulin

C) GnRH

D) Progesterone

E) Oxytocin

25. What happens in the luteal phase?

A) Egg is fertilized

B) Egg is released

C) Endometrium is maintained

D) Menstruation starts

E) Follicles develop

26. How many chromosomes are in a human egg?

A) 92

B) 46

C) 23

D) 12

E) 24

27. What is the term for the release of an egg from the ovary?

A) Menstruation

B) Fertilization

C) Ovulation

D) Conception

E) Cleavage

28. Where does implantation of the fertilized egg occur?

A) Fallopian tube

B) Vagina

C) Ovary

D) Endometrium

E) Cervix

29. What structure remains after the egg is released and produces hormones?

A) Corpus luteum

B) Follicle

C) Ovum

D) Endometrium

E) Cervix

30. Which part of the brain regulates the menstrual cycle?

A) Cerebellum

B) Hypothalamus

C) Hippocampus

D) Medulla

E) Pineal gland

Questions About the Female Reproductive: Organs, Egg Cells, and the Menstrual Cycle

Answers and Explanations

1. C – Ovaries produce eggs and female sex hormones (estrogen and progesterone).

2. D – LH surge triggers ovulation.

3. E – Fertilization typically occurs in the fallopian tubes.

4. D – The uterus houses and nourishes a fetus.

5. B – Progesterone thickens the endometrium.

6. D – The vagina connects the uterus to the outside.

7. C – The endometrium supplies nutrients to a fertilized egg.

8. D – The menstrual phase involves the shedding of the uterine lining.

9. C – Menarche is the first menstrual period.

10. C – The corpus luteum secretes progesterone.

11. C – Ovulation is the release of an egg from the ovary.

12. D – The fallopian tube carries the egg to the uterus.

13. C – FSH promotes follicle growth.

14. D – Menopause is the end of the menstrual cycle.

15. A – An unfertilized egg survives for 24–48 hours.

16. C – The average menstrual cycle is 28 days long.

17. D – Estrogen thickens the endometrium and promotes follicle development.

18. C – A mature egg is called an ovum.

19. C – The cervix dilates during childbirth.

20. C – A drop in progesterone triggers menstruation.

21. B – In the follicular phase, follicles mature in the ovaries.

22. A – A spike in LH precedes ovulation.

23. C – The cervix allows passage of sperm and the baby during delivery.

24. C – GnRH from the hypothalamus starts puberty by signaling the pituitary.

25. C – In the luteal phase, progesterone maintains the uterine lining.

26. C – The egg contains 23 chromosomes.

27. C – Ovulation is the release of an egg.

28. D – The fertilized egg implants in the endometrium.

29. A – The corpus luteum forms from the empty follicle and secretes hormones.

30. B – The hypothalamus regulates the menstrual cycle via hormone release.

Questions About the Male Reproductive Organs and Development

May 27, 2025 Human Body

Questions About the Male Reproductive Organs and Development

Multiple-Choice Questions: Male Reproductive Organs and Development

1. What is the primary function of the testes?

A) Store urine

B) Produce testosterone and sperm

C) Secrete digestive enzymes

D) Filter blood

E) Maintain blood pressure

Ads

2. Where are sperm cells produced?

A) Prostate gland

B) Epididymis

C) Vas deferens

D) Seminiferous tubules

E) Seminal vesicles

3. Which hormone is primarily responsible for the development of male secondary sexual characteristics?

A) Estrogen

B) Progesterone

C) Testosterone

D) Cortisol

E) LH

4. What is the role of the epididymis?

A) Produce sperm

B) Store and mature sperm

C) Produce testosterone

D) Transport urine

E) Secrete hormones

5. Which structure carries sperm from the epididymis to the urethra?

A) Ureter

B) Vas deferens

C) Seminal vesicle

D) Prostate gland

E) Cowper's gland

6. What is the function of the seminal vesicles?

A) Urine production

B) Oxygen transport

C) Secretion of a fluid that nourishes sperm

D) Sperm production

E) Hormone regulation

7. Which gland surrounds the urethra and contributes to semen production?

A) Pancreas

B) Adrenal gland

C) Pituitary gland

D) Prostate gland

E) Thyroid gland

8. What is the function of the bulbourethral (Cowper's) glands?

A) Store urine

B) Lubricate the urethra

C) Secrete testosterone

D) Absorb nutrients

E) Filter lymph

9. The scrotum is important because it:

A) Provides immunity

B) Warms the testes

C) Maintains proper temperature for sperm production

D) Stores sperm permanently

E) Transports blood

10. Which structure is shared by both the reproductive and urinary systems in males?

A) Vas deferens

B) Seminal vesicle

C) Urethra

D) Epididymis

E) Testes

11. During puberty, which hormone stimulates testosterone production in males?

A) ACTH

B) Oxytocin

C) LH (Luteinizing Hormone)

D) FSH

E) TSH

12. What is the role of FSH (Follicle-Stimulating Hormone) in males?

A) Stimulates prostate growth

B) Causes hair loss

C) Stimulates sperm production

D) Regulates blood sugar

E) Increases metabolism

13. At what stage of development do the testes typically descend into the scrotum?

A) Infancy

B) Puberty

C) At birth or shortly before

D) Adolescence

E) Age 2–3

14. What is cryptorchidism?

A) Inflammation of the penis

B) Overproduction of sperm

C) Failure of one or both testes to descend

D) Hormonal imbalance

E) Excess testosterone production

15. Which part of the sperm contains enzymes to penetrate the egg?

A) Midpiece

B) Tail

C) Nucleus

D) Acrosome

E) Centriole

16. What is the main energy source for sperm motility?

A) Glucose from blood

B) ATP from the mitochondria in the midpiece

C) DNA from the nucleus

D) Lipids from the tail

E) Oxygen from red blood cells

17. What is semen?

A) Pure sperm cells

B) Hormones and red blood cells

C) A mixture of sperm and secretions from accessory glands

D) White blood cells and lymph

E) Mucus only

18. What age range typically marks the onset of puberty in males?

A) 4–6 years

B) 7–9 years

C) 10–14 years

D) 16–20 years

E) 21–25 years

19. What structure helps move sperm through the vas deferens during ejaculation?

A) Cartilage

B) Cilia

C) Peristaltic muscle contractions

D) Bone movement

E) Hair follicles

20. Which of the following is a male secondary sexual characteristic?

A) Increased breast tissue

B) Narrow shoulders

C) Facial hair growth

D) Ovary development

E) Menstruation

Questions About the Male Reproductive Organs and Development

Answer Key with Explanations

1. B – The testes produce sperm and secrete the hormone testosterone.

2. D – Sperm are produced in the seminiferous tubules within the testes.

3. C – Testosterone is responsible for male secondary sexual characteristics like facial hair and deep voice.

4. B – The epididymis stores and allows sperm to mature before ejaculation.

5. B – The vas deferens transports sperm from the epididymis to the urethra.

6. C – Seminal vesicles secrete fructose-rich fluid that nourishes sperm.

7. D – The prostate gland encircles the urethra and adds fluid to semen.

8. B – The bulbourethral glands secrete a lubricating mucus before ejaculation.

9. C – The scrotum maintains the testes at a temperature slightly below body temperature, crucial for sperm production.

10. C – The urethra carries both urine and semen in males.

11. C – LH stimulates the Leydig cells in the testes to produce testosterone.

12. C – FSH acts on Sertoli cells to stimulate spermatogenesis.

13. C – Testes typically descend into the scrotum late in fetal development or at birth.

14. C – Cryptorchidism is the condition where one or both testes fail to descend.

15. D – The acrosome contains enzymes that help sperm penetrate the egg’s outer layers.

16. B – Mitochondria in the midpiece generate ATP for sperm movement.

17. C – Semen is a mix of sperm and secretions from the seminal vesicles, prostate, and Cowper's glands.

18. C – Puberty in males generally starts between ages 10 and 14.

19. C – Peristaltic contractions of smooth muscle help move sperm during ejaculation.

20. C – Facial hair is a secondary sexual characteristic in males due to testosterone.

Questions About Lymphatic System

May 27, 2025 Human Body

Questions About Lymphatic System

Multiple-Choice Questions: Lymphatic System

1. What is the primary function of the lymphatic system?

A) Transport oxygen to cells

B) Produce insulin

C) Return excess tissue fluid to the bloodstream

D) Store calcium

E) Control body temperature

Ads

2. What is lymph?

A) A digestive enzyme

B) A type of red blood cell

C) Fluid derived from interstitial fluid that circulates in the lymphatic vessels

D) A type of hormone

E) A muscle cell

3. Which of the following is not a lymphatic organ?

A) Spleen

B) Thymus

C) Lymph node

D) Liver

E) Tonsils

4. Where are lymphocytes primarily produced?

A) Kidney

B) Liver

C) Bone marrow

D) Heart

E) Pancreas

5. Which of the following organs filters blood and helps fight infections?

A) Heart

B) Spleen

C) Lungs

D) Stomach

E) Pancreas

6. What is the role of lymph nodes?

A) To produce digestive enzymes

B) To filter and trap pathogens in lymph

C) To regulate hormone levels

D) To generate nerve impulses

E) To contract muscles

7. Which type of cell is most active in lymph nodes during an immune response?

A) Red blood cells

B) Osteocytes

C) Lymphocytes

D) Chondrocytes

E) Myocytes

8. What is the role of the thymus in the lymphatic system?

A) It produces bile

B) It filters blood

C) It stores lymph

D) It matures T lymphocytes

E) It digests proteins

9. Which lymphatic organ is located in the upper left portion of the abdominal cavity?

A) Appendix

B) Pancreas

C) Thymus

D) Spleen

E) Liver

10. What is chyle?

A) Hormone secreted by lymph nodes

B) A mixture of lymph and digested fats

C) Protein released by B cells

D) Type of lymphocyte

E) Bacterial toxin

11. What is the function of tonsils in the immune system?

A) Oxygen exchange

B) Filtering blood

C) First line of defense against ingested or inhaled pathogens

D) Controlling hormones

E) Storing enzymes

12. Which vessel transports lymph back into the circulatory system?

A) Aorta

B) Carotid artery

C) Thoracic duct

D) Pulmonary vein

E) Renal artery

13. What do lymphatic capillaries absorb?

A) Red blood cells

B) Oxygen

C) Hormones

D) Excess interstitial fluid

E) Digestive enzymes

14. The right lymphatic duct drains lymph from:

A) The entire body

B) Left leg and abdomen

C) Right arm, right side of head and thorax

D) Both arms

E) Digestive tract only

15. What type of muscle helps move lymph through the lymphatic system?

A) Cardiac muscle

B) Skeletal muscle

C) Smooth muscle

D) Voluntary muscle

E) Involuntary striated muscle

16. Which of the following is a major difference between the lymphatic and circulatory systems?

A) The lymphatic system contains arteries

B) Lymph is oxygenated

C) The lymphatic system has no central pump

D) The lymphatic system transports glucose

E) Blood and lymph move at the same pressure

17. Which cells produce antibodies in the lymphatic system?

A) T cells

B) Natural killer cells

C) Platelets

D) Plasma cells

E) Erythrocytes

18. Which disorder is characterized by swelling due to blocked lymphatic drainage?

A) Anemia

B) Lymphedema

C) Arthritis

D) Hypertension

E) Bronchitis

19. Which structure allows lymph to enter but not exit the lymph node initially?

A) Efferent lymphatic vessels

B) Sinusoids

C) Afferent lymphatic vessels

D) Valve flaps

E) Capillaries

20. What is the immune surveillance role of the lymphatic system?

A) Monitoring oxygen levels

B) Monitoring blood glucose

C) Detecting pathogens and cancer cells in lymph

D) Balancing electrolytes

E) Managing body temperature

Answer Key with Explanations

1. C – The lymphatic system collects and returns excess interstitial fluid to the bloodstream.

2. C – Lymph is a clear fluid that originates from interstitial fluid and travels through lymph vessels.

3. D – The liver is not a lymphatic organ.

4. C – Lymphocytes are produced in the bone marrow.

5. B – The spleen filters blood and helps fight infection.

6. B – Lymph nodes filter lymph and trap pathogens.

7. C – Lymphocytes are the key immune cells active during responses in lymph nodes.

8. D – The thymus matures T lymphocytes.

9. D – The spleen is in the upper left abdomen.

10. B – Chyle is lymph mixed with fats absorbed from the intestines.

11. C – Tonsils help detect and neutralize pathogens from air or food.

12. C – The thoracic duct returns lymph to the circulatory system at the subclavian vein.

13. D – Lymphatic capillaries absorb excess interstitial fluid.

14. C – The right lymphatic duct drains the right arm, head, and thorax.

15. B – Skeletal muscle contractions assist lymph flow.

16. C – The lymphatic system has no heart-like pump; it relies on valves and muscles.

17. D – Plasma cells (mature B cells) produce antibodies.

18. B – Lymphedema is swelling caused by lymphatic blockage.

19. C – Afferent vessels bring lymph into the lymph nodes.

20. C – The immune system uses lymph nodes to detect foreign pathogens and abnormal cells.

Questions on Immune System

May 27, 2025 Human Body

Questions on Immune System

Multiple-Choice Questions: Immune System

1. What is the primary function of the immune system?

A) To regulate body temperature

B) To transport oxygen

C) To fight infections and diseases

D) To digest food

E) To excrete waste products

Ads

2. Which of the following is a type of white blood cell important in immunity?

A) Erythrocyte

B) Neuron

C) Lymphocyte

D) Platelet

E) Myocyte

3. Which organ produces T lymphocytes (T cells)?

A) Liver

B) Spleen

C) Thymus

D) Pancreas

E) Bone marrow

4. Which type of immunity is present from birth and responds to all pathogens in the same way?

A) Adaptive immunity

B) Artificial immunity

C) Innate immunity

D) Acquired immunity

E) Passive immunity

5. What type of cell produces antibodies?

A) T cell

B) Macrophage

C) B cell (Plasma cell)

D) Neutrophil

E) Basophil

6. Which of the following is an example of passive immunity?

A) Immunization with a vaccine

B) Recovery from an illness

C) Inheritance of immune genes

D) Antibodies from breast milk

E) Developing antibodies after infection

7. What is the main role of the spleen in the immune system?

A) Absorb nutrients

B) Filter blood and store white blood cells

C) Regulate blood sugar

D) Control hormone levels

E) Pump blood

8. Which of these is considered a first line of defense?

A) T cells

B) Stomach acid

C) B cells

D) Interferons

E) Antibodies

9. What are antigens?

A) Hormones that stimulate immunity

B) White blood cells

C) Substances that trigger an immune response

D) Blood proteins

E) Enzymes in saliva

10. Which cells directly destroy infected or abnormal body cells?

A) B cells

B) Helper T cells

C) Cytotoxic T cells

D) Platelets

E) Natural killer cells

11. Which immune cells act as antigen-presenting cells?

A) Red blood cells

B) Platelets

C) Dendritic cells

D) Muscle cells

E) Skin cells

12. What is the term for an exaggerated immune response to a harmless substance?

A) Infection

B) Allergy

C) Immunity

D) Resistance

E) Vaccination

13. Which chemical is released by mast cells during allergic reactions?

A) Insulin

B) Histamine

C) Hemoglobin

D) Cytokine

E) Dopamine

14. What is the primary purpose of vaccination?

A) To cure diseases

B) To kill bacteria directly

C) To stimulate immune memory

D) To increase body temperature

E) To regulate hormones

15. Which of the following is NOT a component of the immune system?

A) Bone marrow

B) Lymph nodes

C) Spleen

D) Liver

E) Thymus

16. Which of these diseases results from the immune system attacking the body's own tissues?

A) HIV/AIDS

B) Influenza

C) Lupus

D) Tuberculosis

E) Malaria

17. HIV primarily infects which type of immune cell?

A) B cells

B) Cytotoxic T cells

C) Helper T cells (CD4+)

D) Dendritic cells

E) Neutrophils

18. What part of the immune system remembers past infections?

A) Macrophages

B) Platelets

C) Memory cells

D) Neutrophils

E) Basophils

19. Which protein helps to tag pathogens for destruction?

A) Actin

B) Hemoglobin

C) Myosin

D) Antibody

E) Keratin

20. Which type of immunity develops after exposure to a disease-causing organism?

A) Passive immunity

B) Innate immunity

C) Artificial immunity

D) Active immunity

E) Primary immunity

21. Which cell type engulfs and digests pathogens?

A) Platelets

B) Red blood cells

C) Macrophages

D) B cells

E) Astrocytes

22. What does the lymphatic system transport?

A) Oxygen and glucose

B) Hormones and enzymes

C) Lymph, which contains white blood cells

D) Red blood cells only

E) Digested fats

23. What is the name of the small organs that filter lymph and trap pathogens?

A) Spleens

B) Kidneys

C) Pancreas

D) Lymph nodes

E) Glands

24. Which type of white blood cell is often the first to respond to an infection?

A) B cell

B) Neutrophil

C) Basophil

D) Eosinophil

E) Monocyte

25. Which autoimmune disease affects the joints?

A) Diabetes mellitus

B) Rheumatoid arthritis

C) Asthma

D) Lupus

E) Tuberculosis

26. What is an immunodeficiency disorder?

A) A disease that results in an overactive immune system

B) When the immune system attacks non-harmful substances

C) A lack of immune response or weakened defense

D) A genetic overproduction of white blood cells

E) A normal part of aging

27. What is a cytokine?

A) A pathogen

B) A digestive enzyme

C) A signaling protein used in immune responses

D) A hormone from the adrenal gland

E) A type of antibody

28. What type of immunity is provided by vaccines?

A) Innate

B) Passive

C) Artificial active

D) Natural passive

E) Genetic

29. Which cells coordinate the immune response by activating other immune cells?

A) Platelets

B) Neutrophils

C) Helper T cells

D) Macrophages

E) Natural killer cells

30. Which condition is caused by the failure of the immune system to recognize self-antigens?

A) Allergy

B) Immunodeficiency

C) Autoimmune disease

D) Vaccination

E) Infection

Answer Key with Explanations

1. C – The immune system protects the body from pathogens.

2. C – Lymphocytes are crucial white blood cells in immunity.

3. C – The thymus is where T cells mature.

4. C – Innate immunity is the body’s general defense mechanism.

5. C – B cells (when activated as plasma cells) produce antibodies.

6. D – Breast milk provides passive immunity via antibodies.

7. B – The spleen filters blood and stores immune cells.

8. B – Stomach acid is a first-line defense against pathogens.

9. C – Antigens trigger immune responses.

10. C – Cytotoxic T cells destroy infected cells directly.

11. C – Dendritic cells present antigens to T cells.

12. B – Allergies are overreactions to harmless antigens.

13. B – Histamine causes allergy symptoms.

14. C – Vaccines stimulate immune memory without causing disease.

15. D – The liver is not directly part of the immune system.

16. C – Lupus is an autoimmune disease.

17. C – HIV targets CD4+ (Helper T) cells.

18. C – Memory cells "remember" previous infections.

19. D – Antibodies tag pathogens for destruction.

20. D – Active immunity results from infection or vaccination.

21. C – Macrophages engulf and digest microbes.

22. C – Lymph transports white blood cells and filters fluid.

23. D – Lymph nodes filter pathogens from lymph.

24. B – Neutrophils are often the first responders to infection.

25. B – Rheumatoid arthritis involves autoimmune attack on joints.

26. C – Immunodeficiency involves a weakened or absent immune system.

27. C – Cytokines are communication proteins in immunity.

28. C – Vaccines provide artificial active immunity.

29. C – Helper T cells activate other immune cells.

30. C – Autoimmune diseases result from loss of self-tolerance

+3000 Questions: Biology and Chemistry with Answer Key

Introdution to Biology

Molecular Biology

Evolution

Molecular Biology

Genetics

Cell Biology

Ecology

Prokaryotes

Virus

Protists

Fungi

Kingdom Plantae

Animal Kingdom

Human Body

What You'll Find on Science LexiWiki:

Why Choose Science LexiWiki?

Perfect For:

The Importance of Studying Biology in High School

What Is Biology?

Why Is Biology Important in High School?

Biology and Academic Success

How to Make the Most of Biology Classes

Start Your Biology Journey Today

How to Study for Biology Exams in High School: Best Tips and Strategies

Why Is Studying Biology Different?

Top Tips: How to Study for High School Biology Exams

Try our Biology Practice Questions to test yourself on real exam-style problems.

Bonus Tips for Biology Success

Get Exam-Ready

Main Areas of Biology: What They Are and What They Study

1. Cell Biology (Cytology)

2. Genetics

3. Anatomy and Physiology

4. Ecology

5. Microbiology

6. Botany

7. Zoology

8. Evolutionary Biology

9. Biotechnology

Why Learn the Areas of Biology in High School?

Explore More

Questions About Sexually Transmitted Infections (STIs)

Multiple-Choice Questions

Answers and Explanations

Questions About Embryology: Fertilization, Growth, Placenta, and Pregnancy

Multiple-Choice Questions

Answers and Explanations

Questions About the Female Reproductive: Organs, Egg Cells, and the Menstrual Cycle

Multiple-Choice Questions

Answers and Explanations

Questions About the Male Reproductive Organs and Development

Multiple-Choice Questions: Male Reproductive Organs and Development

Answer Key with Explanations

Questions About Lymphatic System

Multiple-Choice Questions: Lymphatic System

Answer Key with Explanations

Questions on Immune System

Multiple-Choice Questions: Immune System

Answer Key with Explanations

Search

Popular Posts

Science and Biology