NEET BIOLOGY

Detailed explanation-1: -The concept of the struggle for existence concerns the competition or battle for resources needed to live. It can refer to human society, or to organisms in nature. The concept is ancient, and the term struggle for existence was in use by the end of the 18th century.

Detailed explanation-2: -So, the correct answer is ‘Intraspecific struggle’.

Detailed explanation-3: -In Darwin’s theory on the mechanism of evolution, competition among living things is viewed as a major part of the “struggle for existence” and therefore as a basis for natural selection (Darwin 1872).

Detailed explanation-4: -noun phrase : the automatic competition of members of a natural population for limited vital resources (such as food, space, or light) that results in natural selection.

Detailed explanation-5: -Solution : Intraspecific struggle, interspecific struggle and environmental struggle are the three types of struggle for existence.