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391.

The diameter of water molecule is approximately:

A.	2.64A	B.	2.54A
C.	2.96A	D.	1.33A

392.

The direct exchange of ions between the roots and clay colloids called:

A.	Soil solution theory	B.	Contact exchange theory
C.	Diffusion	D.	None of the above

393.

The discovery of oxygen was done by ________, which proved the keystone of other discoveries that went far toward unlocking the mystery of plant life:

A.	John Mayow	B.	John Woodward
C.	Benjamin Franklin	D.	Priestly

394.

The dominant colour of spectral (rainbow) in soil indicates:

A.	Kalolinite type of clay mineral	B.	Hue
C.	Value	D.	Chroma

395.

The earth mainly consists of:

A.	Four spheres	B.	Three spheres
C.	Five spheres	D.	All of above

396.

The earth's element crust is a part of:

A.	Hydrosphere	B.	Lithosphere
C.	Atmosphere	D.	All of above

397.

The elements play direct role in formation of chlorophyll is:

A.	Phosphorus and Potassium	B.	Calcium and Zinc
C.	Nitrogen and Magnesium	D.	Iron and Sulphur

398.

The example of amide group nitrogenous fertilizer:

A.	Ammonium sulphate	B.	Urea
C.	Calcium ammonium Nitrate	D.	None of the above

399.

The factor responsible for the formation of acid soil:

A.	Low rainfall	B.	High rainfall
C.	High evaporation	D.	Irrigation with saline water

400.

The fertilizers which have two or more than two major plant nutrient in their chemical composition are called:

A.	Double fertilizer	B.	Complex fertilizer
C.	Mixed Fertilizer	D.	Organic fertilizer