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341.

Tarai soils are high in:

A.	Iron	B.	Sodium
C.	Organic matter	D.	Calcium

342.

Temperature has got significant effects on:

A.	Structure	B.	Biological activity
C.	Weathering of rocks and menerals	D.	All of above

343.

The acidic igneous rocks contain silica:

A.	>65%	B.	<65%
C.	60-65%	D.	None of above

344.

The acidity of H+ absorbed on solid phase is known as:

A.	Reserve acidity	B.	Active acidity
C.	Both of the above	D.	None of these

345.

The acidity of H+ in aqueous phase of soils is called:

A.	Reserve acidity	B.	Active acidity
C.	Permanent charge	D.	None of these

346.

The addition of excess soluble phosphate fertilizers to soils may affect plant growth by:

A.	Inhibiting the growth of micro-organism	B.	Reducing Fe and Al
C.	Reducing the availability of Zn	D.	Reducing the availability of Ca

347.

The adverse effect of poor quality water is/will be more on:

A.	Clay soil	B.	Loamy soil
C.	Sandy soil	D.	None of the above

348.

The alkali soil can be identified by seeing:

A.	White layer of salts on the surface	B.	Black colour on the surface
C.	Red colour on the surface	D.	None of the above

349.

The amount of N2 fixed by clostridium is ______ mg N2 per gm sugar:

A.	15 - 25	B.	7 ? 12
C.	2 ? 7	D.	25 - 50

350.

The amount of P in soil and soil solution that can exchange with orthophosphate in addition to soil as measured by plant growth in soil system is termed as:

A.	A-value	B.	L-value
C.	E-value	D.	None of these