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271.

Phosphates enzyme play a major role in ______ of organic phosphates in soil:

A.	Adsorption	B.	Mineralization
C.	Immobilization	D.	None of these

272.

Phosphorous occurs in soil in:

A.	Inorganic form only	B.	Organic form only
C.	Both (a) & (b)	D.	None of these

273.

Phosphorus fixation refers to the phenomenon of:

A.	Absorption of P2O5 by plant	B.	Leaching of P2O5 from soil by percolating waters
C.	Conversion of soluble phosphorus into plant unavailable forms	D.	Anion exchange with colloidal constituents of soil

274.

Phosphorus is esential for:

A.	Cell division	B.	Development of meristematic tissues
C.	Both of these	D.	None of these

275.

Physical weathering causes:

A.	Alternation of rocks and minerals	B.	Disintegration of rocks and minerals
C.	Decomposition of rocks and minerals	D.	Synthesis of rocks and minerals

276.

Plants meet their oxygen requirement by:

A.	Breakdown of water in the plant body	B.	Absorbing oxygen from air
C.	Absorbing oxygen from soil	D.	All the above methods

277.

Poor quality water contains:

A.	Higher amount of soluble salts	B.	Lower amount of soluble salts
C.	Higher amount of calcium	D.	None of the above

278.

Potassium fixation is higher in:

A.	1:1 type clays	B.	2:1 type clays
C.	Oxide of Fe and Al	D.	None of the above

279.

Potassium is considered vital in:

A.	Synthesis of protein and amino acids	B.	Photosynthetic activity of leaves
C.	Movement of manufactured food from leaves to root	D.	All of the above

280.

Process of immobilization refers to:

A.	Conversion of inorganic form to organic form	B.	Conversion of organic form to inorganic form
C.	Conversion of N-compound to protein	D.	None of the above