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421.

The mass per unit volume of the solid mass of the soil excluding pore space is known as:

A.	True density	B.	Bulk density
C.	Both (a) & (b)	D.	None of the above

422.

The maximum moisture is available to plants at:

A.	Field capacity	B.	Wilting point
C.	Hygroscopic coefficient	D.	Saturation

423.

The maximum phosphorus availability in most of the soils in the pH range:

A.	4.0 - 4.5	B.	6.0 - 6.5
C.	7.0 - 7.5	D.	None of these

424.

The maximum size limit of clay fraction is considered to be:

A.	0.02 mm	B.	0.002 mm
C.	0.0002 mm	D.	None of the above

425.

The method of survey adopted for intensive cultivation is:

A.	Reconnaissance survey	B.	Detailed survey
C.	Detailed and reconnaissance survey	D.	All of the above

426.

The microbes, which can survive at the temperature 25 - 30 ?C is termed as:

A.	Thermoduric	B.	Mesophylic
C.	Psychrophylic	D.	Thermophytic

427.

The mineral gypsum has chemical composition:

A.	CaSO4	B.	CaSO4.2H2O
C.	CaSO4.5H2O	D.	None of the above

428.

The mineral limonite has chemical composition:

A.	Fe2O3	B.	2Fe2O3,3H2O
C.	Fe3O4	D.	None of above

429.

The mineralization of organic phosphorus has been studied in relation to:

A.	C/N/P	B.	C/N/S
C.	C/N/K	D.	C/N/Ca

430.

The molecular transfer of gases due to concentration of partial pressure gardient in the soil is termed as:

A.	Diffustion	B.	Mass flow
C.	Both of the above	D.	None of the above