Question

As per Allen’s rule, mammals of cold regions conserve body heat through.
A. High ratio of surface areas to volume
B. Low surface areas to volume ratios
C. Longer extremities
D. Smaller extremities

Answer 1

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 step by step answer: Allen’s rules is a part of the ecological rules. Allen’s rules are the same as Bergman’s rule because it is related to the size, volume, or surface area ratio of animals living in the different regions. There are two types of regions a) Arctic region b) Equatorial region.
a) Arctic region:
The animals present in the Arctic region have smaller tail ears and less amount of food available. The lower surface area in this region.
b) Equatorial region:
The animals live in that region with large hands, feet, ears, and consume large amounts of food. The higher surface area in this region. Ear, tail, wing shorts in the arctic region because it is the coolest part of the body if the area is large we lose more heat from these areas. In the thermal animals, body temperature is high, and lives in the equatorial region.
Therefore the correct option is (B).

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