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171.

Hygroscopic moisture is held at:

A.	31 atm.	B.	1000 atm.
C.	99 atm.	D.	200 atm.

172.

Identify which of the following is a passive soil forming fctors:

A.	Relief	B.	Biosphere
C.	Climate	D.	None of these

173.

If a soil has a bulk density of 1.50 mg/m3 and a particle density of 2.65 ms/m3 then the percentage pore spice of the soil will be:

A.	35	B.	38.5
C.	43.4	D.	48.5

174.

If crop residues have more than 2% nitrogen, then:

A.	Net mineralization will take place	B.	Net immobilization will take place
C.	Partial mineralization will take place	D.	None of these

175.

While classifying the soil according to textural class in equilateral triangle, suggested by the USDA, % of clay is plotted parallel to:

A.	Silt	B.	Sand
C.	Clay	D.	Loan

176.

If soyabean is being grown for the first time in a field, the seed should be treated with ______ culture:

A.	Azospirillium	B.	Azotobacter
C.	Rhizobium	D.	Phosphor bacterin

177.

If the C: N ratio of crop residues is 20-30 then:

A.	Mineralization may not take place	B.	Immobilization may take place
C.	Immobilization may not take place	D.	Both immobilization and mineralization take place

178.

If the C:N ratio of crop residues is less than 20 then:

A.	Immobilization will take place	B.	Mineralization will take place
C.	Both of these	D.	None of these

179.

If the nitrogen content in crop residues is less than 2% nitrogen, then:

A.	Net mineralization may take place	B.	Net immobilization may take place
C.	Partial mineraliization may take place	D.	All of these

180.

If the particle size is 2mm to 7.5 cm then it is known as:

A.	Gravels	B.	Stones
C.	Sand	D.	Silt