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261.

Organism used as biofertilizer in wheat cultivation:

A.	Azotobacter	B.	Rhizobium
C.	Nostoc	D.	All of these

262.

Oxidation of sulfure to sulphate is carried out by:

A.	Bacillus spp	B.	Aspergillus spp
C.	Azotobacter spp	D.	Thiobacillus spp

263.

Oxygen requirement of the plant is met by absorbing:

A.	Respiration	B.	Transpiration
C.	Photosynthesis	D.	Chlorophyll formation

264.

Peat soils are ______ in nature:

A.	5 - 8%	B.	10-40%
C.	50-55%	D.	60-65%

265.

Peat soils have _____ organic matter:

A.	5 - 8%	B.	10-40%
C.	50-55%	D.	60-65%

266.

Pedology is the study of:

A.	Rocks	B.	Soils
C.	Nutrient management	D.	Crop production

267.

Percent nitrogen is equal to:

A.	Percent organic matter x 5	B.	Percent organic matter x 0.05
C.	Percent of organic matter x 0.06	D.	None of the above

268.

Percent of total N present in soil is in the form of organic N:

A.	95.99	B.	40.8
C.	100	D.	20

269.

Percentage of soil solids in soil is:

A.	30%	B.	40%
C.	50%	D.	60%

270.

pH value of 7.0 denotes that the soil reaction is:

A.	Acidic	B.	Alkaline
C.	Neutral	D.	High alkaline