Question:

Very small animals are rarely found in polar regions because

Updated On: Jul 7, 2022
  • small animals have a larger surface area relative to their volume, so they lose body heat very fast when it is cold outside
  • small animals have a smaller surface area relative to their volume, so they lose body heat very fast when it is cold outside
  • small body volume makes internal heat production very difficult
  • none of these
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The Correct Option is A

Solution and Explanation

Temperature affects the absolute size of an animal and the relative proportions of various body parts. Birds and mammals attain greater body size in cold regions than in warm areas. But poikilotherms are smaller in cold region. This is Bergmann's rule. This is true because small animals have larger surface area relative to their volume, so if they are in cold, they lose their body heat very fast. In cold climate, reduced surface area to volume ratio is ideal.
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Notes on organisms and populations

Concepts Used:

Organisms and Populations

Organisms:

An attached living system that lives in an environment is commonly known as an organism. These organisms are able to retain certain behaviors and structures. Some examples of organisms are plants, animals, bacteria, fungi, and humans. A group of these organisms leads to the formation of a population. The collection of the population forms a community that assists in the operation of ecosystems. 

Each and every organism has the ability to adapt itself to various conditions of the environment. This capacity of organisms is due to their genetic variations. It is due to this only that their probability of survival get increases. For instance, camels adapt themselves to survive in desert areas and polar bears adapt to the extreme cold conditions or situations through their dense fur coat.

Populations:

A collection of organisms or individuals of a species that live, at a specific time, in a geographical area that is well-defined and capable of interbreeding is described as a population.

Read More: Organisms and Populations