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21.

Environmental stability is:

A.	All the material resources around us and degradation is closely related to the pattern of resource use within the society	B.	The trees are the most important feature of the environment in which we leve, work, play and enjoy the bounties of nature
C.	Both (a) & (b)	D.	None of these

22.

The desert vegetation has been destroyed by incessant pressure of grazing by millions of:

23.

Trees and the landscape is:

A.	Trees and shrubs play in important and significant role in improvement of the landscape	B.	By judicious use of trees, it has been possible to convert, dull drab and nonotonous country side into a green and colorful expanse
C.	Both (a) & (b)	D.	None of these

24.

Trees and man is:

A.	Man always had a strong affinity for the trees	B.	At time this has even reached the extremes of becoming an object of worship
C.	Both (a) & (b)	D.	None of these

25.

_____ have all drawn inspiration from trees:

26.

Air pollution is caused by:

A.	The amoke, gases and fumes coming out of the factory chimneys	B.	The transport vehicles badly pollute the air
C.	Both (a) & (b)	D.	None of these

27.

Trees play an important role in:

A.	Supply of clean air	B.	They absorb carbon-dioxide from the atmosphere and release oxygen
C.	Both (a) & (b)	D.	None of these

28.

Forest for tourism and recreation is:

A.	A great sources of attraction to the people who like to see the nature in its true perspective	B.	The Himalayas are a tourists paradise
C.	Both (a) & (b)	D.	None of these

29.

In the plain with the development of tourist facilities such as:

30.

Shad and shelter is:

A.	Pakistan were summer temperature go as high as 45	B.	The trees planted on farm and marginal lands and along the roads, canals and railway tracks play a very import role in reducing the suffering of people.
C.	Both (a) & (b)	D.	None of these