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511.

Upward translocation of fluid in xylem takes place due to:

A.	Pull of transpiration stream	B.	Pumping action of guard cells
C.	Suction by sunrays	D.	All above

512.

Urea contain:

A.	24% nitrogen	B.	60% nitrogen
C.	16.0 nitrogen	D.	46.0 nitrogen

513.

Urea is mineralized in the presence of enzyme:

A.	Co-enzyme	B.	Peptase
C.	Urease	D.	All of the above

514.

Use of materials like S, polyform UF, isobutylidene diurea etc, improves fertilizer use efficiency, when such additions are used, the N-fertilizers are termed as:

A.	Prilled urea	B.	Controlled release N-fertilizers
C.	Slow nitrifying N-fertilizers	D.	Complex fertilizers

515.

V = 2rg (PP-Pm)/gm is:

A.	Darcy's law	B.	Stoke's law
C.	Beer's law	D.	None of these

516.

Vermiculite is:

A.	2:1 type mineral	B.	2:2 type mineral
C.	1:1 type mineral	D.	None of the above

517.

Volume of soil under the influence of roots of growing plants is known as:

A.	Phyto-bio-sphere	B.	Phyto-bio-zone
C.	Rhizosphere	D.	Phytozone

518.

Volumetric heat capacity can be calculated by multiplying specific heat with the corresponding:

A.	Volume	B.	Mass
C.	Density	D.	Thermal conductivity

519.

Water drains by gravitational force from pores larger than:

A.	About 10 - 20 microns	B.	About 20 - 30 microns
C.	About 30 - 60 microns	D.	None of the above

520.

Weathered material transported by means of force of gravity the deposition is termed as:

A.	Colluvial	B.	Alluvial
C.	Cumulose	D.	Aeolion