Explain the following :

i. The year 1921 is known as the 'demographic divide'.

ii. The period during the years 1951 - 1981 is often referred to as the period of 'population explosion'.

State three differences between compact settlements and dispersed settlements. 

Give three positive consequences of migration.

Despite tank irrigation being a simple form of irrigation, it is not used by all farmers. Explain Why.

i. Today the need to conserve water resources has become greater that ever. Explain.

ii. Mention two steps that need to be undertaken for the conservation of water resources. 

16.

Give two demerits of Canal irrigation.

Mention two methods by which the problem of limited Agricultural land may be solved.

Mention three ways in which technology has benefitted agriculture.
 

i. What geographical conditions are required for the growth of wheat?

ii. Compare wheat cultivation in India and China - with reference to the varieties grown .

Why is mica used in the electrical and electronic industry ?