Q. Which of the following is /are correct statements about the ecosystem?

1. It forms with the interaction of biotic and abiotic elements’ interaction
2. In an ecosystem different species have different niche unique to themselves but can be overlapping
3. An ecotone is a part of an ecosystem.

Select the correct option from the codes given below:
Answer: 1, 2 & 3
Notes: An ecosystem is formed by the interaction of biotic and abiotic factors. Niche is formed in an ecosystem. An ecologoical niche is the role and responsibility of an organism in its environment formed due to its interaction with biotic and abiotic factors of an ecosystem. It includes things like food habit, habitat, functional interaction etc. No two species can have exactly same niche in an ecosystem. They can have overlapping niches to some extant but not the same.
A ecotone is formed with the interaction of two different biological community thus forming a transitional area having its own ecosystem. Example- Mangroves.