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21.

A sub-surface horizon in which the accumulation of organic matter and clay occurs just below the plough:

A.	A horizon	B.	B horizon
C.	C horizon	D.	None of these

22.

A sub-surface horizon with highly oxidized material and 1:1 type clay minerals is known as:

A.	Cambic horizon	B.	Sodic horizon
C.	Oxic horizon	D.	Agric horizon

23.

A surface horizon, which has very high organic matter, is:

A.	Hisitic epipedon	B.	Ochric epipedon
C.	Umbric epipedon	D.	None of the above

24.

A thick dark coloured horizon, which has high, base saturation (50% or more), high organic matter content and with strong soil structure is called :

A.	Umbric epipedon	B.	Mollie epipedon
C.	Ochrie epipedon	D.	Histic epipedon

25.

A unit of soil classification as well as soil mapping which is similar to soil series in most of the soil properties except one or two but the area of such a unit is not enough to establish it as a separate series and show on a soil map, is known as:

A.	Soil association	B.	Soil phase
C.	Soil variant	D.	None of them

26.

A vertical section of soil body, which shows different layer, is known as:

A.	Soil horizons	B.	Soil profile
C.	Regolith	D.	Parent material

27.

A vertical section of the soil through all its horizons are extending into the parent material is known as:

A.	Soil horizons	B.	Solum
C.	Profile	D.	None of the above

28.

A well developed soil has:

A.	A horizon	B.	B horizon
C.	C horizon	D.	All of the above

29.

Quantity of single super phosphate needed for applying 80 kg P2O5/ha to sugarcane will be:

A.	250 kg	B.	500 kg
C.	750 kg	D.	1000 kg

30.

A = B (1-y) denotes A-value in which A is equal to:

A.	Amount of available nutrients in soil	B.	Amount of total nutrients in soil
C.	Amount of unavailable nutrients in soil	D.	None of these