How many of the following statements are correct about niche?
i. It denotes the functional role played by an organism.
ii. It deals with the flow of energy from one organism to another.
iii. As soon as niche is left vacant other organisms fill that position.
iv. The same niche is shared by two or more species.
v. Organisms living in the same habitat differ in their niches.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.