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21.

Which of the following plants is used as windbreak?

A.	Delonix	B.	Mangifera
C.	Eucalyptus	D.	Prosopis

22.

"Chipko Movement" is related to:

A.	Plant conservation	B.	Project tiger
C.	Animal breding	D.	Operation flood

23.

In order to maintain proper ecological balance:

A.	The existing forests should be cleared and new ones should be planted	B.	Some quick growing anuals should be planted if a tree must be cut for other uses
C.	Tree must be cut whenever necessary because the underground part performs the useful purpose	D.	A tree should be planted in place of one to be cut

24.

Side effect of heavy and constant grazing is that the:

A.	Upper layers of soil are loosened and are eroded	B.	Lower layers are made more compact and root respiration is interfered with
C.	Lower compact layers make root penetration difficult	D.	All of the above

25.

Soil erosion is prevented by:

A.	Afforestion	B.	Deforestation
C.	Denudation	D.	Overgrazing

26.

Constant grazing and browsing in an area may ultimately result in the formation of:

A.	Dense forest	B.	Grassland
C.	Bushy vegetation	D.	Desert

27.

The possible beneficial effect of the grazing animals is:

A.	Addition of their excreta to the soil	B.	Eradication of weeds
C.	Removal of wild plants	D.	Removal of wild animals

28.

When young plants are grazed too heavily they get killed because:

A.	The roots are starved	B.	Of the mechanical injury to roots
C.	Most of the aerial parts are eaten away	D.	All of the above

29.

Soil erosion can be prevented by:

A.	Allowing herbivorous animals to graze excessively	B.	Growing plants to form a soil cover
C.	Making the land slopy	D.	Increasing fertility

30.

The grazing animals can change the type of vegetation by:

A.	Bringing in plant pathogens	B.	Selective grazing
C.	Cross pollination	D.	Bringing the seeds of other plants