(a) How is Biogas formed?
(b) Mention any one advantage of Biogas over other non-conventional energy resources.

Mention the climatic condition suitable for the development of tropical evergreen forest.

Study the extract of the Survey of India Map Sheet No. G43S10 and answer the following questions:
(a) On which bank of the Sukli nadi is the settlement of Pamera situated?
(b) Identify the settlement pattern seen in the grid square 6732.

Explain the following:
(a) Mixed farming
(b) Zayad
(c) Transplantation

On the outline map of India provided:
Shade and label the Chota Nagpur plateau.

Study the extract of the Survey of India Map Sheet No. G43S10 and answer the following questions:
(a) Give the six-figure grid reference for spot height .437 in the southeastern part of the map extract.
(b) Aman, a local craftsman, wants to sell his product to a large gathering to earn money instantly.
1. Which settlement should he go to?
2. Name the month in which he should visit the settlement named by you above.

Study the extract of the Survey of India Map Sheet No. G43S10 and answer the following questions:
Roshan, while travelling from Sirori to Tokra, observed that the surface water sources are dry except for the
reservoir near Tokra.
(a) What according to you may be the reason for the presence of water in the reservoir in 6832 near
Tokra settlement?
(b) State whether this reservoir is artificial or natural source of water.