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221.

Which one of the following pairs of elements and the mineral from which they are obtained is not correctly matched?

A.	Sulphur - Pyrite	B.	Boron - Siderite
C.	Zinc - Calamine	D.	Copper - Malachite

222.

Maximum absorption of water by roots takes place through the :

A.	Zone of elongation	B.	Zone of maturation
C.	Root hair	D.	Root cap

223.

Maximum population of microorganisms found in soils is of:

A.	Bacteria	B.	Fungi
C.	Actinomycetes	D.	Viruses

224.

Mg and S are termed as:

A.	Primary nutrients	B.	Micronutrients
C.	Ultra micronutrients	D.	Secondary nutrients

225.

Mica is:

A.	1:1 type clay mineral	B.	2:1 type clay mineral, non expandable
C.	2:2 type clay mineral, L is present inside the layer	D.	None of the above

226.

Microbial population of a soil in general

A.	Decreases with depth	B.	Increases with depth
C.	Constant throughout the profile	D.	No specific trend

227.

Mineralization of N refers to the conversion of :

A.	Organic form into inorganic form	B.	Inorganic form into organic form
C.	Organic form to nitrogenous compound	D.	All of the above

228.

Moisture content from lower upper plastic limit is known as:

A.	Sticky point	B.	Field capacity
C.	Plastic number	D.	All of the above

229.

Molybdenum is a component of:

A.	Chlorophyll	B.	Nitrogenase enzyme
C.	Cell wall of plants	D.	None of the above

230.

Montmorillonite is following type of clay mineral:

A.	1;1	B.	2;2
C.	3;1	D.	None of these