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

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

Name the two types of canals. Name two states where perennial canals are widely used.

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.

Canals are a channel for supply of water from rivers to the farm fields. The perennial canals are not only an advantage but can be disadvantageous too. The perennial canals are functional in the state of Punjab due to the favourable situations available there.

(i) What conditions favour the development of canal irrigation in the mentioned area?

(ii) State two disadvantages of it.