21.

Give one important use of the following types of trees:

i. Sundari

ii. Sandalwood

iii. Rosewood

Name the natural vegetation largely found in the following regions:

i. The delta of the Ganga river.

ii. The windward side of the Western Ghats

iii.The Deccan Plateau

State two reasons why tank irrigation is popular in South India.

Mention two advantages that surface wells have over inundation canals.

Give one geographical reason for each of the following statements:

i. Irrigation is necessary despite the monsoon.

ii. The drip method of irrigation is the best among all modern methods of irrigation.

iii.Canal irrigation leads to the ground around it becoming unproductive.

Give three reasons for the conservation of water resources.

 Mention any two uses of manganese. 

Which of the different varieties of coal is used for domestic purposes and why?

Name the mineral used in the manufacture of:

i. Cement

ii. Aluminum

iii. Synthetics

Which state is the leading producer of the following minerals?

i. Coal

ii. Oil

iii. Manganese