A) hydrosere
B) lithosere
C) psammosere
D) xerosere
Correct Answer: B
Solution :
The occurrence of relatively difinite sequence of communities over a period of time in the same area is known as ecological succession. Lithosere is a type o xerosere originating on bare rock surfaces. The original substratum is dificient in water and lacks any organic matter having only minerals in disintegrated unweathered state. The pioneer vegetation is therefore lichens. Hydrosere originating in a pond starts with the colonization of some phytoplanktons which form the pioneer plant community.
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