Give a geographical reason for each of the following:

(i) Well irrigation is confined mainly to the alluvial plains.

(ii) In Tamil Nadu, nearly one-third of the net irrigated area is under canal irrigation.

(iii) Drip irrigation reduces loss of water through evaporation.

(i) Name any two states where well irrigation is practised.

(ii) Give one advantage and one disadvantage of tubewell irrigation.

How are the fields irrigated using the Persian wheel method?

Give a geographical reason for each of the following:

(i) Canals make the soil infertile.

(ii) Tubewell irrigation is quite expensive.

(iii) Excessive accumulation of salts make the soils unsuitable for cultivation.