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141.

Hydrological cycle is under the control of:

A.	Grasslands	B.	Forests
C.	Planktons	D.	Epiphytes

142.

The maximum amount of CO2 fixed by green plants by way of photosynthesis in a year is:

A.	9 x 1013 kg	B.	8 x 1012 kg
C.	9 x 1011 kg	D.	8 x 1010 kg

143.

The sulphate rocks are formed in ocean by leaching of:

A.	FeS and Fe2S3	B.	Organic sulphates and -SH
C.	Soluble inorganic sulphates	D.	All of these

144.

Mark the incorrect statement with reference to carbon cycle:

A.	Lime rocks contribute to CO2 of water	B.	Atmospheric CO2 gets dissolved in water
C.	CO2 is returned by combustion of fuel	D.	75% of total carbon lies in geological component

145.

If we completely remove the decomposers from an ecosysters, its functioning will be adversely affected because:

A.	Herbivores will not receive solar energy	B.	Rate of decomposition of other component will be very high
C.	Mineral movement will be blocked	D.	Energy flow will be blocked

146.

Ecosystem receives nitrogen from outside through:

A.	Biological nitrogen fixation	B.	Electrification of nigrogen
C.	Industries	D.	All the above

147.

One of the major difficulties in the biological control of insect pests is that:

A.	The predator develops a preference to other diets and may itself become a pest	B.	They do not always survive when transferred to a new environment
C.	The method is less effective as compared to the use of insecticides	D.	The practical difficulty in introducing the predator to specific area

148.

Niche of a species in an ecosystem refers to its:

A.	Place of occurrence	B.	Competitive ability
C.	Centre of origin	D.	Function at its place of occurrence

149.

Energy transfer from one trophic level to other in a food chain is:

A.	1%	B.	2%
C.	10%	D.	20%

150.

The transfer of energy from one trophic level to another is governed by the 2nd law of thermodynamics. The average efficiency of energy transfer from nerbivores to carnivores is:

A.	25%	B.	50%
C.	10%	D.	5%