Question

An endothermic organism is
A. Grasshopper
B. Hydra
C. Earthworm
D. Blue jay
E. Frog

Answer 1

Endothermic animals are also called warm-blooded animals. These animals maintain their constant body temperature independent of the environment. Their internal metabolism is responsible for maintaining body heat and temperature homeostasis.

Step by step answer: Option A) Grasshopper is an ectothermic organism and not endothermic. The ectothermic organism is also called cold-blooded. They depend on the external environment to maintain their body temperature. They expose their head and body side to the sun rays and maintain body temperature.
Option B) Hydra is an ectothermic organism or a cold-blooded organism. It also depends on the external environment to maintain body temperature. In hydra, the body size is regulated by temperature via Wnt signaling.
Option C) Earthworms are also ectothermic or cold-blooded organisms. They also depend on the external environment to maintain their body heat. They have temperature sensing neurons that sense the heat and that is how they reduce their body functions so that they can live longer even in increasing heat. Their reproduction also depends on temperature.
Option D) Blue jay is endothermic or warm-blooded organisms. They maintain their body temperature independent of the external environment. Their metabolic process helps them to maintain temperature homeostasis. The blue jay is a bird and all birds and mammals are warm-blooded organisms. They have special metabolic tissues that help regulate the internal temperature or some can decrease the metabolic rate to preserve the body heat.
Option E) Amphibians like frogs are also ectothermic and they maintain homeostasis dependent on the external environment. They bask in sun or hibernate or show partial activity based on day and night temperature and weather conditions.
Hence, the correct answer is an option (D)

Note: Endotherms have a high metabolic rate compared to ectothermic organisms. Endotherms have Brown adipose tissue or other metabolically active organs that maintain the internal body heat.