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491.

The unconsolidated material on the underlying rock is called:

A.	Regolith	B.	Soil
C.	Solum	D.	Earth

492.

The unit of fertilizer or any other growth factor which is necessary to produce the yield which in 50% of maximum possible yield is called:

A.	Optimum unit	B.	Standard unit
C.	Baule unit	D.	Fertilizer unit

493.

The value above ______ ppm is associated with boron toxicity:

A.	150	B.	200
C.	250	D.	300

494.

The water held with a water potential greater than. 1/3 bar is known as:

A.	Field capacity	B.	Gravitational water
C.	Available water	D.	Unavailable water

495.

The weathered material transported by means of waters and deposited in river basins are termed as:

A.	Alluvial	B.	Marine
C.	Lacustrine	D.	None of above

496.

The weathering causes:

A.	Disintegration and decomposition of rocks	B.	Disintegration and decomposition of rocks and minerals
C.	Both (a) & (b)	D.	None of these

497.

The zinc deficiency in rice causes disease:

A.	Khaira	B.	Bacterial leaf streak
C.	Bacterial leaf blight	D.	Sheath blight

498.

There is a net increase in the mineralization of organaic nitrogen in soil when:

A.	C:N = 20 - 30:1	B.	C:N = < 20:1
C.	C:N = . 30:1	D.	Nitrogen is taken up by the crops

499.

Thermal conductivity of different textural classes of the soils follows the following order:

A.	Sand < Loam < Clay < Peat	B.	Sand > Loam > Clay > Peat
C.	Sand = Clay = Loam = Sand	D.	None of the above

500.

Til cake contains about:

A.	6.0% N	B.	2.5% N
C.	10.2% N	D.	9.8% N