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401.

The first passage through which nutrients enters into the leaves:

A.	Intercuticular passage	B.	Mesophyll cells
C.	Cell wall plastic membrane	D.	None of the above

402.

The foliated metamorphic rocks are formed due to:

A.	Pressure-metamorphism	B.	Heat - metamorphism
C.	Hydro metamorphism	D.	None of above

403.

The following factors other than gypsum solution may effect the extraction of calcium and suplhate from a gypsiferous soil:

A.	Calcium solution of gypsum	B.	Ecxchange reactions wherein calcium replaces no cations
C.	Sulphte solution from a source other than gypsum	D.	None of these

404.

The gaseous exchange between soil and atmosphere is the:

A.	Artificial process	B.	Natural process
C.	Change in soil structure	D.	None of the above

405.

The global average of solar radiation reaching the earth is:

A.	20%	B.	30%
C.	40%	D.	50%

406.

The harmful effect of saline soil is due to:

A.	High osmotic pressure of soil solution	B.	Low osmotic pressure of soil solution
C.	High pH	D.	Low pH

407.

Which of the following statement is correct?

A.	Blue-green algae causes plant diseases	B.	Blue-green algae fix atmospheric nitrogen in soil
C.	Blue-green algae grows best in maize crop	D.	Dry conditions are good for growth of blue-green algae

408.

Which of the following soils has higher buffering capacity?

A.	Sandy soils	B.	Loamy soil
C.	Loamy sand	D.	Clay soils

409.

The highest nitrogen content among the commonly used nitrogenous fertilizers is embodied by:

A.	Anhydrous ammonia	B.	Urea
C.	Ammonium nitrate	D.	Calcium ammonium nitrate

410.

The horizons, which make up the profile of a forest soil would include:

A.	A, B and C	B.	A, C and O
C.	B and O	D.	A, B, C and O