Q25 of 465 Page 45

wells are very deep.

Tube wells

They are dug for water extraction at deep levels. They are generally 30 metres long and are covered.


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23

The process of supplying .... to crops in the fields by means of canals, reservoirs, wells, river valley systems and river lift systems is known as irrigation.

 24

..... wells are not very deep .

 26

Organic manures include ……and …manure and vermicompost.

 27

Vermicompost is a type of soil made by .... and microorganisms.