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21.

Grasslands are:

A.	The prairies of North America and the steppe of Russia and Central Asia	B.	Grassland ecosystem support thousand of different species, above and below the ground
C.	Both (a) & (b)	D.	None of these

22.

Norman Borlaug, the American agricultural scientist and plant pathologist developed the high yield strains that greatly increased crop yields. He laid the groundwork for the green revolution and was awarded the Nobel Prize for Peace in ________

A.	1970	B.	1972
C.	1974	D.	1976

23.

Ozone layer having:

A.	The protective layer of ozone in the upper stratosphere, found at a level between 15 and 150 km above	B.	The Earth which prevents harmful ultraviolet B radiation which causes skin cancer and threatens plant life from reaching the ground
C.	Both (a) & (b)	D.	None of these

24.

Pleonotology is:

A.	The study of fossil plants and animals and of the rock formations where they are found	B.	The information is used increasingly in environmental sciences to build up a picture of past environments
C.	Both (a) & (b)	D.	None of these

25.

Peat means:

A.	A dense accumulation of only partially decomposed plant materials which has formed in wetlands over a period of thousand of years	B.	It collects in still water which does not have enough oxygen to complete the total process of decay
C.	Both (a) & (b)	D.	None of these

26.

The redwood tree is:

A.	The tallest living coniferous evergreen tree	B.	To reach a height of over 300 feet
C.	The Sequia sempervirens (the redwood tree is also very long lived) are found from southwest	D.	All of the above

27.

Termites are:

A.	Many parts of the world, but primarily in tropical rain forests	B.	They live in highly organized colonies to a strict caste system
C.	The nests are built to provide central heating and air-conditioning	D.	All of the above

28.

Transboundary pollution is:

A.	Trnsboundary pollution describes polluted air and water or any other contaminated waste that is generated in ove country and transmitted to other	B.	The most pervasive pollutant is sulphur dioxide a by-product of the burning of fossil fuels in power stations
C.	Both (a) & (b)	D.	None of these

29.

Tropical rain forests are:

A.	The most valuable and the richest ecosystems on earth	B.	They play a critical pat in the earth's life support systems and house 50% and possibly as much as 90% of all the species on earth
C.	They are a key storehouse of foods, oils and minerals and source of ingredients that make up a range of medical treatments	D.	All of the above