Questions on Amphibians: Structure, Reproduction, Classification, Evolution, and Ecology
Multiple-Choice Questions: Amphibians (Structure, Reproduction, Classification, Evolution, and Ecology)
Structure
1. Amphibians typically breathe through:
A) Gills only
B) Lungs only
C) Skin, lungs, and sometimes gills
D) Spiracles
E) Book lungs
2. Which of the following is a key adaptation in amphibians that aids movement on land?
A) Cartilaginous fins
B) Feathers
C) Strong, muscular limbs
D) Wings
E) Segmental bodies
3. Amphibians regulate body temperature by:
A) Internal heating
B) Generating metabolic heat
C) Ectothermic behavior
D) Insulating fur
E) Producing sweat
4. The skin of amphibians is:
A) Thick and scaly
B) Covered in feathers
C) Moist and permeable
D) Protected by fur
E) Dry and keratinized
5. Amphibians often have a three-chambered heart, consisting of:
A) One atrium and two ventricles
B) Two atria and one ventricle
C) One atrium and one ventricle
D) Two ventricles only
E) Four chambers like mammals
6. Which sense is usually well-developed in amphibians?
A) Magnetic
B) Vision
C) Echolocation
D) Electroreception
E) Thermovision
7. Amphibian larvae (like tadpoles) primarily use which structure to breathe?
A) Spiracles
B) Gills
C) Lungs
D) Skin
E) Air sacs
8. Amphibians absorb water mostly through:
A) Drinking with their mouths
B) Specialized glands
C) Their moist skin
D) Their eyes
E) Their cloaca
Reproduction
9. Most amphibians lay their eggs:
A) In the soil
B) On tree bark
C) In water
D) In the mouth
E) Inside other animals
10. Fertilization in most amphibians is:
A) Internal
B) External
C) Asexual
D) Via spores
E) Self-fertilizing
11. Amphibian eggs lack:
A) Genetic material
B) Membranes
C) Shells
D) Embryos
E) Chorion
12. Metamorphosis in frogs includes:
A) Direct development
B) Gradual loss of eyes
C) Transformation from tadpole to adult
D) Growth of feathers
E) Return to larval stage
13. In amphibians, the cloaca serves as:
A) A breathing organ
B) A digestive enzyme
C) An exit for reproductive and digestive systems
D) A part of the ear
E) A muscle
14. Some frogs exhibit parental care by:
A) Abandoning eggs immediately
B) Guarding or carrying eggs on their back
C) Feeding their young with milk
D) Burying their eggs
E) Incubating eggs in pouches
15. In caecilians, fertilization is:
A) Always external
B) Through budding
C) Internal using a copulatory organ
D) Unnecessary due to parthenogenesis
E) Through egg fusion
16. Which hormone controls amphibian metamorphosis?
A) Estrogen
B) Insulin
C) Thyroxine
D) Testosterone
E) Adrenaline
Classification
17. Which of the following is not a class or order of amphibians?
A) Anura
B) Urodela
C) Gymnophiona
D) Caudata
E) Lepidoptera
18. Frogs and toads belong to which order?
A) Caudata
B) Anura
C) Gymnophiona
D) Crocodylia
E) Testudines
19. Salamanders and newts are part of:
A) Anura
B) Urochordata
C) Caudata/Urodela
D) Gymnophiona
E) Reptilia
20. The order Gymnophiona refers to:
A) Tree frogs
B) Burrowing, legless amphibians
C) Lizards
D) Poisonous toads
E) Marine turtles
21. Amphibians are:
A) Mammals
B) Fish
C) Ectothermic vertebrates
D) Invertebrates
E) Endothermic reptiles
22. Which of these features unites all amphibians?
A) Presence of fur
B) Ability to fly
C) Moist skin and aquatic larvae
D) Scales and claws
E) Four-chambered hearts
Evolution
23. Amphibians are believed to have evolved from:
A) Reptiles
B) Lungfish or lobe-finned fish
C) Birds
D) Insects
E) Sharks
24. Amphibians were the first vertebrates to:
A) Reproduce sexually
B) Have a four-chambered heart
C) Live partly on land
D) Develop scales
E) Develop internal fertilization
25. The fossil Ichthyostega is significant because it:
A) Was the first amphibian to fly
B) Represents early marine reptiles
C) Shows transition from water to land
D) Was the first to develop lungs
E) Proves that fish evolved from frogs
26. Amphibians evolved during the:
A) Precambrian
B) Cambrian
C) Devonian
D) Triassic
E) Jurassic
27. One major challenge for amphibians evolving to land was:
A) Lack of oxygen
B) Too many predators
C) Desiccation (drying out)
D) Lack of food
E) Too much light
28. The evolution of limbs in amphibians is considered a key step in:
A) Aquatic diversity
B) Evolution of wings
C) Terrestrial adaptation
D) Returning to water
E) Developing scales
Ecology
29. Amphibians are considered bioindicators because:
A) They live in deserts
B) They resist pollution
C) Their health reflects environmental quality
D) They produce electricity
E) They are top predators
30. Amphibians play an ecological role by:
A) Pollinating flowers
B) Being top predators in oceans
C) Controlling insect populations
D) Producing milk
E) Eating large mammals
31. Amphibians typically require __________ to reproduce.
A) Fire
B) Soil
C) Water
D) Ice
E) Trees
32. Amphibians are in decline globally due to:
A) Vaccination
B) Habitat loss and disease
C) Overpopulation
D) Climate resistance
E) Increased immunity
33. Amphibians are most active in:
A) Arctic winters
B) Dry deserts
C) Moist environments
D) Deep ocean
E) Snowy mountains
34. Chytridiomycosis is a disease that affects amphibians and is caused by:
A) Virus
B) Fungus
C) Bacteria
D) Pollution
E) Parasites
35. Amphibians are preyed upon by all except:
A) Birds
B) Snakes
C) Frogs
D) Insects
E) Mammals
36. Many amphibians hibernate during:
A) Spring
B) Mating season
C) Harsh environmental conditions
D) Lunar eclipses
E) Daytime
37. Amphibians can be found on every continent except:
A) Asia
B) Europe
C) Africa
D) Antarctica
E) Australia
38. Amphibians help keep ecosystems balanced by:
A) Replacing birds
B) Dominating the food chain
C) Linking aquatic and terrestrial food webs
D) Planting trees
E) Removing oxygen
39. Amphibians' thin skin makes them vulnerable to:
A) Cold
B) Noise
C) Environmental toxins and dehydration
D) Hunger
E) Overfeeding
40. Some amphibians produce toxins to:
A) Attract mates
B) Communicate
C) Defend against predators
D) Feed their young
E) Store energy
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Answers with Explanations
1. C) Skin, lungs, and sometimes gills – Amphibians use multiple methods.
2. C) Strong, muscular limbs – Essential for land movement.
3. C) Ectothermic – They rely on the environment.
4. C) Moist and permeable – Allows gas exchange.
5. B) Two atria and one ventricle – Amphibian heart structure.
6. B) Vision – Often highly adapted for hunting.
7. B) Gills – Especially in larval stages.
8. C) Their moist skin – Amphibians absorb water through the skin.
9. C) In water – Eggs need moisture to develop.
10. B) External – Common in frogs and toads.
11. C) Shells – Amphibian eggs are gelatinous.
12. C) Transformation from tadpole to adult – Classic metamorphosis.
13. C) An exit for reproductive and digestive systems – Multipurpose structure.
14. B) Guarding or carrying eggs – Seen in some frog species.
15. C) Internal using a copulatory organ – Seen in caecilians.
16. C) Thyroxine – Triggers metamorphosis.
17. E) Lepidoptera – This is a butterfly/moth order.
18. B) Anura – Frogs and toads.
19. C) Caudata/Urodela – Salamanders and newts.
20. B) Burrowing, legless amphibians – Caecilians.
21. C) Ectothermic vertebrates – They are cold-blooded animals.
22. C) Moist skin and aquatic larvae – Amphibian hallmark.
23. B) Lungfish or lobe-finned fish – Their ancestors.
24. C) Live partly on land – Amphibians were pioneers.
25. C) Shows transition from water to land – Important fossil.
26. C) Devonian – “Age of Fish” but amphibians began here.
27. C) Desiccation – Drying out was a key challenge.
28. C) Terrestrial adaptation – Limbs helped in land life.
29. C) Their health reflects environmental quality – Bioindicators.
30. C) Controlling insect populations – Important ecological role.
31. C) Water – Essential for egg development.
32. B) Habitat loss and disease – Major contributors.
33. C) Moist environments – They thrive in wet conditions.
34. B) Fungus – Chytrid fungus is devastating.
35. D) Insects – Rarely prey on amphibians.
36. C) Harsh environmental conditions – Such as cold or drought.
37. D) Antarctica – Too cold and dry.
38. C) Linking aquatic and terrestrial food webs – Key ecological role.
39. C) Environmental toxins and dehydration – Skin is vulnerable.
40. C) Defend against predators – A survival mechanism
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