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141.

When a plant first begins to wilts permanently in a pot, its 54.5 gms of soil has 4.5 gms of wter. The PWP of this soil is:

A.	4.50%	B.	9%
C.	8.25%	D.	16.50%

142.

Euhalophytes grow where the concentration of NaCl ranges:

A.	Between 0.1 - 0.5%	B.	Between 0.01 - 0.1%
C.	Above 1.0%	D.	Between 0.5 - 1.0%

143.

Plants growing on sand and gravel are called:

A.	Eremophytes	B.	Oxylophytes
C.	Psilophytes	D.	Psammophytes

144.

Which of the following is a mangrove plant?

A.	Acanthus ilicifolius	B.	Avicennia offcinalis
C.	Ceriops roxburghiana	D.	All of these

145.

Mark the free floating hydrophyte:

A.	Sagittaria	B.	Typha
C.	Najas	D.	Spirodela

146.

Magnolia and oaks occur in the following zone:

A.	Tropical	B.	Sub-tropical
C.	Alpine	D.	Temperate

147.

Mark the true xerophyte:

A.	Capparis aphylla	B.	Solanum xanthocarpum
C.	Euphorbia milli	D.	All of these

148.

The temperature based zone at an altitude of 10,000 is:

A.	Tropical	B.	Sub-tropical
C.	Temperate	D.	Alpine

149.

The orange and red wave lengths of light are able to penetrates in a sea upto a depth of:

A.	5 meters only	B.	20 meters only
C.	50 meters	D.	80-100 meters

150.

The alpine forests are classed nder the plant group called:

A.	Mesotherms	B.	Megatherms
C.	Microtherms	D.	Hekistotherms