CSS :: Soil Science

@ : Home > Agriculture > Soil Science

For students in search of

241.

Which one of the following pairs is correct?

A.	Urea - 42%	B.	DAP - 20%
C.	(NH4)2 SO4 - 21.5%	D.	MoP - 47.5%

242.

Nitrate levels in drinking water above about ______ mg per litre are considered a human health hazard:

A.	5	B.	10
C.	15	D.	20

243.

Nitrification in the soil take place by:

A.	Reduction process	B.	Oxidation process
C.	Biological oxidation	D.	Both (a) and (b)

244.

Nitrification is mainly carried out by:

A.	Hetero-trophic organism	B.	Photoauto-trophic organism
C.	Chemoauto-trophic organism	D.	None of the above

245.

Nitrogen is absorbed by the plants in the form:

A.	Only as NO3-1	B.	Only as NH4+
C.	Both (a) & (b)	D.	None of the above

246.

Nitrogen is an essential nutrient element for the plants because:

A.	It imparts early vigorous vegetative growth and dark green colour	B.	It provides extensive root system
C.	It strengthens straw and prevent lodging	D.	It stimulates seed formation

247.

Nitrogen is taken by the plants in the form of:

A.	Elemental nitrogen	B.	Nitrate
C.	Nitrite	D.	None of these

248.

Nitrogen, phosphorous, potassium, calcium, magnesium and sulphur, which are used by plants in relatively large quantities, are referred to as:

A.	Macro nutrients	B.	Micro nutrients
C.	Trace nutrients	D.	Bulk nutrients

249.

Nitrogenous fertilizer's are classified into:

A.	Two groups	B.	Three groups
C.	Four groups	D.	None of the above

250.

Non-humic substances are less complex and are _____ to microbial attack than those belonging to humic group:

A.	More resistant	B.	Less resistant
C.	More susceptible	D.	Less susceptible