Questions on Autotrophs and Heterotrophs
20 multiple choice questions on Autotrophs and Heterotrophs, followed by the answer key at the end.
Multiple Choice Questions: Autotrophs and Heterotrophs
1. What is an autotroph?
A) An organism that consumes other organisms
B) An organism that makes its own food
C) A carnivorous animal
D) A decomposer
2. Which of the following is a heterotroph?
A) Tree
B) Algae
C) Human
D) Grass
3. Which process is used by autotrophs to make food?
A) Digestion
B) Photosynthesis
C) Fermentation
D) Respiration
4. Heterotrophs depend on autotrophs for:
A) Heat
B) Food and oxygen
C) Movement
D) Water
5. What kind of energy do autotrophs primarily use to make food?
A) Chemical
B) Kinetic
C) Solar
D) Mechanical
6. Which organism is an example of an autotroph?
A) Cow
B) Fungi
C) Mushroom
D) Cyanobacteria
7. Which group contains only heterotrophs?
A) Plants, algae, bacteria
B) Deer, lion, mushroom
C) Grass, trees, moss
D) Phytoplankton, seaweed, cactus
8. Which of the following is not an autotroph?
A) Grass
B) Green algae
C) Mushroom
D) Oak tree
9. Animals are considered heterotrophs because they:
A) Make their own food
B) Photosynthesize
C) Absorb sunlight
D) Consume other organisms
10. What do chemoautotrophs use to produce food?
A) Sunlight
B) Oxygen
C) Chemical compounds
D) Carbon dioxide
11. Which of the following is an autotrophic process?
A) Ingestion
B) Photosynthesis
C) Absorption
D) Hunting
12. Which type of organism is most likely at the base of a food chain?
A) Heterotroph
B) Scavenger
C) Decomposer
D) Autotroph
13. Why are autotrophs essential to ecosystems?
A) They decompose dead organisms
B) They provide energy-rich compounds for other organisms
C) They hunt prey
D) They compete with animals for food
14. Fungi are classified as heterotrophs because they:
A) Have chlorophyll
B) Absorb nutrients from other organisms
C) Use sunlight to create food
D) Live underground
15. Which of these is a heterotrophic plant?
A) Venus flytrap
B) Cactus
C) Algae
D) Bamboo
16. In which kingdom do most autotrophs belong?
A) Animalia
B) Fungi
C) Plantae
D) Protista
17. What product do autotrophs release during photosynthesis?
A) Nitrogen
B) Carbon dioxide
C) Oxygen
D) Glucose only
18. Which organisms are both autotrophic and prokaryotic?
A) Cyanobacteria
B) Yeasts
C) Paramecia
D) Amoebas
19. The energy source for photoautotrophs is:
A) Water
B) Heat
C) Light
D) Glucose
20. Which of the following best describes heterotrophs?
A) Make their own organic molecules
B) Feed on other organisms for energy
C) Use inorganic compounds as food
D) Convert light to energy directly
- Questions on Exocytosis and Endocytosis
- Questions on the Sodium-Potassium Pump
- +20 Questions on Active Transport
Answer Key
1. B – An organism that makes its own food
2. C – Human
3. B – Photosynthesis
4. B – Food and oxygen
5. C – Solar
6. D – Cyanobacteria
7. B – Deer, lion, mushroom
8. C – Mushroom
9. D – Consume other organisms
10. C – Chemical compounds
11. B – Photosynthesis
12. D – Autotroph
13. B – They provide energy-rich compounds for other organisms
14. B – Absorb nutrients from other organisms
15. A – Venus flytrap
16. C – Plantae
17. C – Oxygen
18. A – Cyanobacteria
19. C – Light
20. B – Feed on other organisms for energy
Dive into the groundbreaking science of neurotransmitters—your brain’s invisible architects—in Chemical Harmony: How Neurotransmitters Shape Our Lives (2025). This meticulously researched book reveals how serotonin, dopamine, GABA, and other brain chemicals silently orchestrate every aspect of your existence, from decision-making and relationships to mental health and emotional resilience.Click here to buy
👉 +3000 Biology Questions with Answers Key.
Share Online!
