Q.

In autogenic succession,

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a

early and continued dominance of autotrophic organisms occurs, such as green plants.

b

the community itself modifies its own environment, thus causing its own replacement by new communities.

c

replacement of existing communities is caused largely by any other external condition.

d

early dominance of heterotrophs occurs, such as bacteria, fungi, and other animals.

answer is D.

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Detailed Solution

In the word autogenic, auto means ‘self’, and genic means ‘to produce’.

In autogenic succession, the biotic components are present in the ecosystem of that community. The members of that community cause various changes, which lead to the beginning of ecological succession.

Therefore, in ecological succession, the community itself modifies its own environment, thus causing its own replacement by new communities.

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