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161.

The equatic thermal strata where no temperature gradients are observed is called:

A.	Epilimnion	B.	Metalimnion
C.	Hypolimnion	D.	Thermocline

162.

The ultraviolet radiations are able to peretreate in a sea as deep as:

A.	40 meters	B.	400 meters
C.	200 meters	D.	5 meters

163.

The optimum temperature for seedling growth in the upper gangetic plains is around:

A.	10? - 15?C	B.	5? - 10?C
C.	20? - 25?C	D.	30? - 40?C

164.

The facultative heliophytes are infact:

A.	Heliophytes	B.	Chasmophytes
C.	Chersophytes	D.	Sciophytes

165.

The heliophytes are characterised by:

A.	Vertically oriented leaves	B.	Horizontally oriented leaves
C.	Dropping leaves	D.	Twisted leaves

166.

The classification of plant groups on the basis of temperature differentiating four zone such as megatherms was proposed by:

A.	Clements	B.	Raunkiaer
C.	Odum	D.	Warming

167.

Which of the following is a shourt day plant?

A.	Triticum	B.	Lycopersicon
C.	Gossypium	D.	Nicotiana

168.

The percentage of argon in the atmosphere is:

A.	About 1%	B.	0.35%
C.	0.90%	D.	3%

169.

The percentage of light from total solar input utilized by plants:

A.	About 1%	B.	3 - 5%
C.	7 - 8%	D.	14%

170.

Plants growing in alpine zone are dwarf due to:

A.	Low temperature	B.	High wind velocity
C.	High light intensity	D.	None of these