Ecological Niche Definition

Ecological niche refers to the complete role and position of an organism within its environment, including its physical location AND its functional relationships (feeding, reproduction, interactions). Option (a) Ecotone is a transition zone between two ecosystems. Option (c) Habitat refers only to the physical place where an organism lives, not its functional role. Option (d) Home range is the area an animal travels within for survival. Only ecological niche encompasses both physical space AND functional role in the community. Niche is broader than habitat. > Niche = Physical Space + Functional Role. Answer: (b).