1. What is the primary difference between endotherms and ectotherms?
A. Endotherms produce their own body heat; ectotherms rely on external sources.
B. Endotherms rely on external sources; ectotherms produce their own heat.
C. Both regulate their body temperature internally.
D. Neither can regulate their body temperature.
Answer: A
2. Which of the following is an example of an endothermic animal?
A. Lizard
B. Frog
C. Penguin
D. Turtle
Answer: C
3. Which type of animal is more active in colder environments?
A. Endotherms
B. Ectotherms
C. Both are equally active.
D. Neither are active in the cold.
Answer: A
4. What mechanism do ectotherms primarily use to regulate their body temperature?
A. Shivering
B. Behavioral adaptations
C. Internal metabolic heat production
D. Perspiration
Answer: B
5. Which of these animals is an ectotherm?
A. Dog
B. Crocodile
C. Whale
D. Sparrow
Answer: B
6. How do endotherms maintain their body temperature?
A. Through metabolic heat production.
B. By absorbing heat from the environment.
C. By storing fat in their tails.
D. By relying on body surface heat only.
Answer: A
7. What is a disadvantage of being an endotherm?
A. Limited activity in colder climates.
B. High energy expenditure to maintain body temperature.
C. Dependence on sunlight for warmth.
D. Cannot survive in fluctuating temperatures.
Answer: B
8. What advantage do ectotherms have over endotherms?
A. Can remain active at night.
B. Lower energy requirement for temperature regulation.
C. Greater resistance to freezing.
D. Faster metabolic rates.
Answer: B
9. Which of the following is NOT true for ectotherms?
A. They rely on external heat sources.
B. They are more efficient in energy usage.
C. They are limited by environmental temperatures.
D. They generate heat through metabolism.
Answer: D
10. Which animal group is primarily endothermic?
A. Mammals
B. Amphibians
C. Reptiles
D. Insects
Answer: A
11. What term is used to describe “warm-blooded” animals?
A. Ectotherms
B. Endotherms
C. Poikilotherms
D. Heterotherms
Answer: B
12. What term describes animals whose body temperature fluctuates with the environment?
A. Endotherms
B. Ectotherms
C. Homeotherms
D. Thermoregulators
Answer: B
13. Why do ectotherms often rely on basking in the sun?
A. To find food.
B. To increase their body temperature.
C. To escape predators.
D. To conserve energy.
Answer: B
14. Which adaptation is common in endotherms for heat retention?
A. Scaly skin
B. Thick fur or feathers
C. Behavioral migration
D. Slim body structure
Answer: B
15. What type of blood flow mechanism helps endotherms conserve heat?
A. Countercurrent heat exchange
B. Direct heat dissipation
C. Parallel flow system
D. Open circulatory system
Answer: A
16. Which habitat is less favorable for ectotherms?
A. Deserts
B. Rainforests
C. Polar regions
D. Wetlands
Answer: C
17. Which physiological process is more pronounced in endotherms?
A. Hibernation
B. Metabolism
C. Excretion
D. External fertilization
Answer: B
18. How do ectotherms survive in freezing environments?
A. Shivering to generate heat.
B. Producing antifreeze proteins.
C. Increasing metabolic activity.
D. Growing thick fur.
Answer: B
19. Which of the following animals exhibits torpor to conserve energy?
A. Polar bear
B. Hummingbird
C. Crocodile
D. Frog
Answer: B
20. What is the primary benefit of being an ectotherm in warm climates?
A. Ability to maintain stable body temperature.
B. Reduced energy needs for thermoregulation.
C. Greater mobility.
D. Enhanced sensory capabilities.
Answer: B
21. Which animal is both endothermic and exhibits hibernation?
A. Bat
B. Snake
C. Shark
D. Frog
Answer: A
22. What is the body temperature range in most endotherms?
A. Constant, around 37\u00b0C in mammals.
B. Variable, matching the environment.
C. Always lower than ectotherms.
D. Unstable in cold environments.
Answer: A
23. Which energy source is crucial for endotherms to generate heat?
A. Solar energy
B. Food metabolism
C. External thermal sources
D. Stored fat only
Answer: B
24. What is a common behavioral adaptation in ectotherms to avoid overheating?
A. Seeking shade
B. Sweating
C. Panting
D. Thickening of skin
Answer: A
25. Which of the following is a key feature of homeothermy?
A. Temperature fluctuates with the environment.
B. Stable internal temperature.
C. Dependency on sunlight for heat.
D. Lower energy needs than poikilotherms.
Answer: B
26. Why do reptiles prefer sunny spots?
A. To dry their skin.
B. To warm up for metabolic activities.
C. To attract prey.
D. To mark territory.
Answer: B
27. What enables birds to remain endothermic during flight?
A. Light body weight
B. High metabolic rate
C. Hollow bones
D. Warm external environment
Answer: B
28. Which environmental condition most restricts ectotherms?
A. Stable temperatures
B. Extreme temperature fluctuations
C. High humidity
D. Low salinity levels
Answer: B
29. How do aquatic ectotherms regulate their body temperature?
A. By swimming to regions of suitable temperature.
B. By sweating through their gills.
C. By increasing metabolic heat.
D. By consuming warm water prey.
Answer: A
30. Which system is more developed in endotherms for thermoregulation?
A. Nervous system
B. Circulatory system
C. Digestive system
D. Reproductive system
Answer: B
