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231.

Which of the following species are restricted to a given area?

A.	Endemic	B.	Sibling
C.	Allopatric	D.	Sympatric

232.

Lichens are well known combination of an alga and a fungus where fungus has:

A.	An epiphytic relationship with the alga	B.	A parasitic relationship with the alga
C.	A symbiotic relationship with the alga	D.	A saprophytic relationship with the alga

233.

Fertility of soil is measured by its ability to:

A.	Hold organic matter	B.	Hold water
C.	Support life	D.	Retain nutrients

234.

The nature of the soil carried by river is:

A.	Sandy	B.	Clayey
C.	Laterite	D.	Alluvial

235.

Development of soil from the parent rock is termed as:

A.	Edaphotropism	B.	Edaptic factor
C.	Pedogenesis ? weathering	D.	Edaphic climax

236.

Xerophytes have longer root system:

A.	To grant mechanical support	B.	Due to light factor
C.	To draw water from deeper zones	D.	None of the above

237.

Largest amount of fresh water on our planet is contained:

A.	In lakes and streams	B.	In rivers
C.	Underground	D.	On polar ice and glaciers

238.

Ephemeral xerophytes are those that are:

A.	Drought resisting	B.	Drought escaping
C.	Drought enduring	D.	None of these

239.

Acacia arabica is a:

A.	Halophyte	B.	Mesophyte
C.	Xerophyte	D.	Hydrophyte

240.

Mycorrhiza is the:

A.	Saprophytic association between fungus and the roots of seed plants	B.	Parasitic association between fungus and the roots of seed plant
C.	Symbiotic association between fungus and the roots of seed plants	D.	All of the above