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411.

The illuviation zone of soil is:

A.	Leaching	B.	Accumulation
C.	Hard crust	D.	None of above

412.

The important function of nitrogen is:

A.	To increase growth and green colour in plants	B.	To increase root development
C.	To help in starch formation	D.	To increase disease resistance

413.

The inherent capacity of a soil to supply nutrients to plants in available and balanced proportion can be represented by:

A.	Soil productivity	B.	Soil taxonomy
C.	Edaphology	D.	Soil fertility

414.

The light coloured soils are:

A.	High in Fe and Mn	B.	Low in fe and Mn
C.	Negligible in Fe and Mn	D.	Not known

415.

The lithosphere is mainly made up of:

A.	Igneous rocks	B.	Sedimentary rocks
C.	Metamorphic rocks	D.	All of rocks

416.

The losses of ammonia usually become greater with ______ soil:

A.	Increase in soil pH	B.	Decrease in soil pH
C.	Increase in soil temperature	D.	Increase in soil calcium

417.

The main characteristics, which render the alkali soils unfavourable for crop growth is:

A.	Excessive concentration of soluble salts	B.	Low pH
C.	Poor physical conditions	D.	All of the above

418.

The main source of heat energy for soil is:

A.	Infra red radiations	B.	Ultra violet radiations
C.	Solar radiations	D.	None of the above

419.

The major nutrients are:

A.	N, P, K	B.	Fe, Mn, Zn
C.	Co, Cl, Na	D.	Cu, Mo, B

420.

The manifestation of the physical forces of cohesion and adhesion acting within the soil at various moisture contents is called:

A.	Soil plasticity	B.	Soil consistency
C.	Soil elasticity	D.	All of these