In autogenic succession

Community itself modifies its own environment, thus causing its own replacement by new commuity

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Early dominance of heterotrophs

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Replacement of existing communites due to external conditions

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Early and continued dominance of autotrophic organisms

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Solution

The correct option is A Community itself modifies its own environment, thus causing its own replacement by new commuity
Ecological successional is a gradual change that can be caused by either endogenous or exogenous factors. If the changes caused by endogenous factors (the plants themselves) are termed autogenic, whereas changes caused by exogenous factors are termed allogenic.
Thus, the correct answer is option A.

Suggest Corrections

Column I	Column II
A. Pioneers	(i) Vegetation which modifies its own environment and thus causing its own replacement
B. Autogenic succession	(ii) Replacement of existing community by external conditions
C. Allogenic succession	(iii) Establishment of organisms in an area into which they have come by dispersal or migration
D. Ecesis	(iv) Primary colonizers

	Column I		Column II
I	Pioneers replacement	A	Vegetation which modifies its own environment and thus, causing its own
II	Autogenic succession	B	Replacement of existing community by external conditions
III	Allogenic succession	C	Establishment
IV	Ecesis	D	Primary colonisers