Question

An endotherm
A) Grasshopper
B) Hydra
C) Earthworm
D) Blue Jay
E) Frog

Answer 1

Hint: Animals that are endothermic are able to maintain their body temperatures constant despite variations in the external temperatures. These warm-blooded animals include all mammals and birds as well as some fish.

Complete answer:
>A grasshopper is an insect. Insect metabolism is affected by the temperature of the environment. They quickly overheat in the sun. Option A is incorrect.
>Hydras are coelenterates, an invertebrate phylum whose body temperature depends on the temperature of the surrounding water. Option B is incorrect
>Earthworms are also ectothermic animals. Being annelids, they need the soil temperatures to be maintained or their activity will decrease. Option C is incorrect.
>Blue jays are birds. Birds, along with mammals, are endotherms. This is why a blue Jay survives changes in seasons. They do this by producing heat within their bodies through metabolic activity. Option D is the correct answer.
>Frogs are vertebrates, belonging to the class Amphibia. Amphibians are unable to regulate body temperatures efficiently. In fact, many species of frogs hibernate or aestivate when the temperatures are too extreme. Option E is incorrect.

Hence the correct answer is option ‘D’.

Note:As endotherms produce heat within their bodies to maintain a constant temperature, they need to eat food more frequently, while many ectotherms can go a long while without eating. For example, a bird needs to feed several times a day, while a snake can go two weeks without eating. Of course, each endotherm will still have an ideal range of temperature in which they are most active and healthy.