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21.

Consumptive use of water by a crop is equal to

A.	the depth of water consumed by evaporation	B.	the depth of water consumed by transpiration
C.	the depth of water consumed by evaporation and transpiration during crop growth, including water consumed by accompanying weed growth	D.	none of the above

22.

The consumptive use of water of a crop

A.	is measured as the volume of water per unit area	B.	is measured as depth of water on irrigated area
C.	may be supplied partly by precipitation and partly by irrigation	D.	all of the above

23.

Which of the following statement is correct?

A.	The gravity water is harmful to the crops.	B.	The hygroscopic water remains attached to the soil molecules by chemical bonds.
C.	The capillary water is utilised by the plants.	D.	all of the above

24.

The ratio between the area of a crop irrigated and the quantity of water required during its entire period of the growth, is known as

A.	delta	B.	duty
C.	base period	D.	crop period

25.

The total depth of water required by a crop during the entire period the crop is in the field, is known as

A.	delta	B.	duty
C.	base period	D.	crop period

26.

The duty is largest

A.	at the head of the main canal	B.	at the head of the water course
C.	on the field	D.	at all place

27.

The time (in days) that crop takes from the instant of its sowing to that of its harvest, is known as

A.	base	B.	crop
C.	kor

28.

The whole period of cultivation from the time when irrigation water is first supplied for preparation of the ground to its last watering before harvesting, is called

A.	base period	B.	crop period
C.	kor period	D.	none of these

29.

The duty of irrigation water goes on

increasing

decreasing

30.

Crop ratio is the ratio of area irrigated

A.	in Rabi season to Kharif season	B.	in Kharif season to Rabi season
C.	under perennial crop to total crop	D.	under perennial crop to non-perennial crop