Study the following diagrammatic representation of organismic response and select the correct option.

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A: Perfect regulators

B: Birds and mammals

C: Nearly all plants

B: Poikilotherms

answer is B.

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Detailed Solution

A represents conformers (e.g., plants), B represents regulators (e.g., birds and mammals) and C represents partial regulators.

Regulators are able to maintain homeostasis by physiological (sometimes behavioural) means which ensures constant body temperature, constant osmotic concentration, etc. Birds, mammals, and few other animals are capable of such regulation (thermoregulation and osmoregulation). Evolutionary biologists believe that the success of mammals is largely due to their ability to maintain a constant body temperature.

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