In a particular habitat the role of an organism is referred to as its

Step 1: Analyze the question The question asks for the term that describes the role an organism plays in its habitat, such as what it eats, how it behaves, and how it interacts with other organisms.

Step 2: Explain the concept

• Habitat is the place where an organism lives, its "address".
• Niche is the role or "job" of the organism in that habitat. It covers its feeding, its position in the food chain, its interactions with other species, and its effect on the environment.

Step 3: Check each option

• A. Level: This could refer to a trophic level, which is a feeding position in a food chain. It is only part of the picture and is not the term for an organism's overall role.
• B. Biomass: This is the total mass of living organisms in an area, so it is not a role.
• C. Niche: This is the role of an organism in its habitat, which is exactly what the question asks.
• D. Space: This is just the physical area, which is closer to the idea of a habitat.

Step 4: Answer The correct option is C. niche.

Exam tip: Remember it this way: Habitat = Address, Niche = Occupation (job). For example, the habitat of a frog is a pond, and its niche is feeding on insects and serving as food for snakes.