Question

Organism living in cold areas have shorter extremities than the organisms of warm area. It states

• A. Graubaer's law
• B. Dollo's law
• C. Allen's law
• D. Bergman's law

Answer 1

The correct option is C Allen's law

The climatic conditions in a particular area regulate the physiological and the morphological characteristics of plants or animals. Allen's rule is a biological rule by Joel Asaph Allen in 1877. It states that the organism adjusts in the given climatic conditions by either minimizing exposed surface area to minimize heat loss in cold climates or maximizing exposed surface area to maximize heat loss in hot climates. The rule predicts that endotherms from hot climates usually have ears, tails, limbs, snouts, etc that are long and thin, while equivalent animals from cold climates usually have shorter and thicker versions of those body parts.

Allen's rule predicts that endothermic animals with the same body volume should have different surface areas that will either aid or impede their heat dissipation.