Question

One of the following refers to Allen’s rule.
a. If the stressful conditions are localized or remain only for a short duration an organism migrates or suspends itself.
b. Mammals from colder climate have shorter ears and limbs to minimize heat loss
c. An organism can move from a stressful habitat to a move hospitable area and return when the stressful period is over.
d. Low atmospheric pressure at high altitude results in sickness.

Answer 1

Hint: The animals (mammals) have shorter ears, wings and limbs adapted to cold climates than the animals adapted to the warm climate according to Allen’s rule. In the endothermic animals different surface areas but have the same body structure and the animals survive in the cold climate need to consume the limited amount of heat as possible. And animals living in warm environments have the opposite concept applied to them.

Complete answer:
Allen’s rules is a part of the ecological rules. Allen’s rules same as the Bergman’s rule because it is related to the size, volume of surface area ratio animals living in the different regions. There are two types of regions a) Arctic region b) equatorial region.

> Arctic region:
The animals present in the Arctic region have smaller tail ears and less amount of food available. Lower surface area in this region.

> Equatorial region:
The animal’s live in that region with large hands, feet, ears and consume large amounts of food. Higher surface area in this region.
Ear, tail, wing shorts in the arctic region because it is the most cool part of the body if the area is large we lose the more heat from these areas. In the thermal animals body temperature is high and lives in the equatorial region.

Hence, the correct answer is option (B).

Note: Cartilage is growing by vertebrates and least partially dependent on temperature. Temperature effects directly on the biological process of the cartilage growth. Allen’s rule experiment performed on the mice to get the desirable result. And cartilage experimental samples in colder temperatures have less growth as compared to higher temperatures.