Question

Bergman’s rule states that-
A. Organisms of hotter areas are higher in color.
B. Mammals and birds of hotter areas undergo aestivation in summer.
C. Aquatic animals are larger as compared to terrestrial ones.
D. Species of larger size are found in colder environments and species of smaller size are found in warmer regions.

Answer 1

Hint: Animals are not present on earth, they have been evolved from cosmic particles. The history of life forms and their growth is studied under the branch of science called evolution. Evolution is a concept where all life forms are categorized according to their days on earth, determining how old they are. Different animals have different ages. As we discussed the evolution and evolutionary concepts, each animal holds a specific age or period from which they have been born or came into life.

Complete answer:
Option A: Organisms of hotter areas are higher in color- organisms which survive in hotter areas have different adaptations. According to Allen's rule animals which live in warmer regions have higher color.
Option A is not correct.
Option B: Mammals and birds of hotter areas undergo aestivation in summer- aestivation is another term used for hibernation. As it referred to the hiding of animals in order to survive the adverse effects of climate. During summers mammals and birds are hidden with all the necessary requirements to some suitable place and remain there until the climate changes.
Option B is not correct.
Option C: Aquatic animals are larger as compared to terrestrial ones- aquatic animals have their own body weight and terrestrial ones have their own. Aquatics are large as the earth is covered with 3/4th of water and one part is land. As land animals have limbs to walk, they are required to maintain body-weight. And aquatic creatures have gliding and swimming characteristics.
Option C is not correct.
Option D: Species of larger size are found in colder environments and species of smaller size are found in warmer regions – organisms at higher altitudes should be larger and thicker than those closer to the equator to have a better conservation of heat. This is called Bergmann's rule.
Option D is correct.

Hence, Option D) is the correct answer.

Note:
Identification of organisms comes under classification according to their species, genus name. classification is a part of a taxonomic group, as taxonomic groups define a variety of categories to deal with animals based on their characters and size, basically morphology. The world we live in has an amazing diversification of animals. Diversity relates to the different kinds of animals prior to their habitats or living conditions or any special character living together in a biosphere. It signifies that every animal can stay together no matter what the difference is.