(a) Locate and name the water reservoirs in Figures (a) and (b).
(b) Which has an advantage over the other and why?
Suggest a few measures for controlling carbon dioxide levels in the atmosphere.
Although coal and petroleum are produced by degradatioin of bio- mass, yet we need to conserve them. Why?
In a village in Karnataka, people started cultivating crops all around a lake which was always filled with water. They added fertilisers to their field in order to enhance the yield. Soon they discovered that the waterbody was completely covered with green floating plants and fishes started dying in large numbers.
Analyse the situation and give reasons for excessive growth of plants and death of fish in the lake.
List two advantages associated with water harvesting at the community level.
Prepare a list of five items that you use daily in the school. Identify from the list such items that can be recycled.
It is important to make small check dams across the flooded gullies because they
(i) hold water for irrigation
(ii) hold water and prevent soil erosion
(iii) recharge ground water
(iv) hold water permanently
(a) (i) and (iv) (b) (ii) and (iii)
(c) (iii) and (iv) (d) (ii) and (iv)
Select the eco-friendly activity among the following
(a) Using car for transportation
(b) Using polybags for shopping
(c) Using dyes for colouring clothes
(d) Using windmills to generate power for irrigation
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