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451.

The most suitable temperature for the growth of maize crop is:

A.	32?C	B.	25?C
C.	21?C	D.	38?C

452.

Which of the agricultural operation requires maximum non-biological power?

A.	Ploughing	B.	Harrowing
C.	Irrigation	D.	Harvesting

453.

Which of one of the following fertilizer is more required for berseem crop?

A.	Nitrogen	B.	Phosphorous
C.	Potash	D.	Boron

454.

The movement of nutrients, ions by mass flow is reduced at low temperatures because of:

A.	Low respiration	B.	Low photosynthesis
C.	Low transpiration	D.	None of these

455.

The mustard crop is regarded ready for harvest when its pods turn ______ in colour:

A.	Greenish-yellow	B.	Greenish-black
C.	Yellowish-green	D.	Yellowish-brown

456.

The nicotine content in cigarette tobacco is:

A.	1 - 2%	B.	3 - 4%
C.	5 - 6%	D.	6 - 5%

457.

The number of known species in genus Gossypium has been estimated at:

A.	10	B.	15
C.	20	D.	25

458.

The number of plants per hectare to be observed in taking one count in seed production of pearlmillet, sorghum, rice-paddies and wheat is _____ as recommended:

A.	500	B.	1000
C.	1500	D.	2000

459.

The number of setts needed for planting one hectare of sugarcane is:

A.	25,000-30,000	B.	35,000-40,000
C.	45,000-50,000	D.	55,000-60,000

460.

The observed best temperature for retting is ______ ?C:

A.	14	B.	24
C.	34	D.	38