Differentiate between.
Autogenic and allogenic succession

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Solution

When a community replaces the other due to the modification of the environment by the community itself, the succession is called autogenic. On the contrary, when a community replaces the other community largely due to the forces other than the effects of communities on the environment, the succession is said to be allogenic.

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Similar questions

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

Cleistogamous flowers are invariably autogenous as there is no chance of cross pollen landing on the stigma. Justify the statement

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