Which of the following statements are true in the context of an ecosystem?

1.The transition area between two biomes is called an ecotone

2.Species indigenous to an area are known as endemic species

3.Species restricted to the ecotone that do not move into either biome are called edge species

4.Species that play a significant role in the functioning of an ecosystem are called keystone species

A2, 3 and 4

B1, 2, 3 and 4 ✓ Correct

C3 and 4

D1, 3 and 4

Correct answer: (B) 1, 2, 3 and 4

Explanation

All four terms are defined correctly, giving the true set of Statements 1, 2, 3 and 4.

Statement 1 is right, as the transition area between two biomes is called an ecotone.

Statement 2 is right, as species native to a single area are called endemic species.

Statement 3 is right, as species confined to the ecotone that avoid both biomes are edge species.

Statement 4 is right, as species with an outsized role in ecosystem function are keystone species.

An ecotone often shows greater species richness, an effect called the edge effect.

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