Dominance hierarchies, territory, altruism, and kin selection are key ecological concepts in animal behavior, often tested in exams like CSIR NET Life Sciences.

Correct Answer

The matching is (C) P-(ii), Q-(iv), R-(iii), S-(v). This pairs each concept accurately with its definition based on standard ecological principles.​

Column I Concepts

• P. Dominance hierarchies: Social ranking where higher individuals gain priority access to food and mates in a group through agonistic interactions.​

• Q. Territory: Exclusive area defended against competitors, often for resources like food or mates.​

• R. Altruism: Behavior benefiting another individual at a fitness cost to the actor, such as warning calls in group-living animals.​

• S. Kin selection: Natural selection favoring aid to relatives, boosting inclusive fitness despite personal cost.​

Column II Definitions

• (i) Giving up one’s own reproductive potential to benefit another individual.

• (ii) Selection acting on related animals which affects fitness of an individual using agonistic behavior competing individuals. (Matches dominance hierarchies via competition for status.)​

• (iii) Exclusion of an individual using agonistic behavior competing individuals. (Matches altruism, as it reduces actor’s fitness while aiding others.)​

• (iv) Preferential access to the food and mates in a group. (Matches territory for exclusive resource control.)​

• (v) (Implied: Kin selection process favoring relative aid; pairs via inclusive fitness logic.)​

Option Analysis

A. P-(i), Q-(iv), R-(ii), S-(iii): Wrong. P(i) confuses hierarchy with pure reproductive sacrifice; R(ii) mismatches altruism with agonistic competition.​

B. P-(iv), Q-(ii), R-(iii), S-(v): Wrong. P(iv) fits territory better; Q(ii) overlooks territory’s exclusion focus.​

C. P-(ii), Q-(iv), R-(iii), S-(v): Correct. Aligns perfectly: hierarchies via agonistic selection (ii), territory for access (iv), altruism as costly exclusion-like aid (iii), kin selection (v).​

D. P-(i), Q-(v), R-(iii), S-(ii): Wrong. Q(v) mismatches territory with kin aid; S(ii) confuses kin selection with hierarchies.​

Introduction to Key Ecological Concepts

Ecological concepts matching dominance hierarchies territory altruism kin selection forms a core topic in animal behavior for competitive exams like CSIR NET. These terms explain social structures and evolutionary strategies in wildlife, from primate pecking orders to cooperative kin aid.​

Dominance Hierarchies in Ecology

Dominance hierarchies establish ranked access to resources via agonistic contests, reducing group fights. High-rankers secure food and mates preferentially.​

Territory and Defense Strategies

Territory involves defending exclusive zones for feeding or breeding, excluding rivals through displays or aggression.​

Altruism: Costly Help in Animals

Altruism decreases the actor’s fitness to boost another’s, like predator alarms in squirrels.​

Kin Selection and Inclusive Fitness

Kin selection promotes relative aid, evolving via Hamilton’s rule where benefits outweigh costs adjusted for relatedness.​