Question

In the strict sense, animals that rely only on the heat from the environment rather than on metabolism to raise their body temperature are called as

• A. Ectothermic
• B. Homeothermic
• C. Endothermic
• D. All of the above

Answer 1

The correct option is A Ectothermic

• Ectotherms lack any metabolic mechanisms for regulating body temperature and maintain a reasonably constant temperature by gaining heat from the environment.
• Endotherms maintain constant body temperature by physiological means i.e by heat generated inside the body.
• Poikilotherms are organisms whose body temperature exhibits a wide range of fluctuation while homeotherms are organisms having constant body temperature independent of environmental temperature.
• Thus, the correct answer is option A.