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21.

The herb stage in a lithosere has predominance of plants like

A.	Rhus	B.	Weissia
C.	Poa	D.	Capparis

22.

Plant succession taking place in sandy area is precisely called:

A.	Halosere	B.	Psammosere
C.	Xerosere	D.	Hydrosere

23.

The climax vegetation in a lithosere of temperate zone is dominated by plants like:

A.	Boswellia	B.	Balanites
C.	Anogeissus	D.	Quercus

24.

If a piece of land which had a plant community becomes barren due to some external thrust, the succession taking place here is called:

A.	Induced	B.	Deflated
C.	Secondary	D.	Retrogessive

25.

The physiographic factor responsible for the initiation of succession to:

A.	Erosion	B.	Fire
C.	Hail	D.	Wind

26.

The invasion of a community in succession involves:

A.	Ecesis, aggregation and competition	B.	Migration, aggregation and competition
C.	Aggregation, competition and coaction	D.	Migration, ecesis and aggregation

27.

The ecological succession was first studied by:

A.	Clements	B.	Hult
C.	Odum	D.	King

28.

The term succession was coined by:

A.	Tansley	B.	Hult
C.	Hodges	D.	Kormondy

29.

The invasion of a new community in a bare area is initiated by:

A.	Migration	B.	Ecesis
C.	Aggregation	D.	All of these

30.

When the substratum has ample of organic matter and there are many deterivore participating in the process, the succession is called:

A.	Allogenic	B.	Retrogressive
C.	Heterotrophic	D.	Induced