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171.

According to Geiger, the percentage of light reflected by the clouds is:

A.	9%	B.	10%
C.	48%	D.	39%

172.

An anatomical features, which exclusively develops to counter high velocity of wind:

A.	Reaction wood formation	B.	Absence of secondary growth
C.	Absence of tylosis	D.	All of these

173.

According to Mc Dougal, the parasitism caused due to fungi and bacteria represent a symbiotic relationship which is:

A.	Social and antagonistic	B.	Nutritive and antagonistic
C.	Social and reciprocal	D.	Nutritive and reciprocal

174.

The air density is maximum:

A.	Above 32'	B.	At the soil surface
C.	Between 32' - 64' from soil level	D.	In the hydrosphere

175.

The relationship between a climber and the host corresponds to:

A.	Neutralism	B.	Mutualism
C.	Parasitism	D.	Commensalism

176.

Flag trees' are formed due to:

A.	Lodging	B.	Erosion and deperition
C.	Unidirectional wind	D.	Salt spray

177.

Plants growing on burnt soil are called:

A.	Heliophilous	B.	Hydrophilous
C.	Pyrophilous	D.	Pyriform

178.

The lichens show a mutualistic relationship originating from:

A.	Obligate parasitism	B.	Facultative parasitism
C.	Halotism	D.	None of these

179.

The advantage/s of fire:

A.	Reduction of biotic thurst	B.	Destruction of diseased plants
C.	Both (a) & (b)	D.	None of these

180.

The seeds of Rhus can endure a temperature as high as:

A.	40?C	B.	60?C
C.	65?C	D.	80?C