Q13 of 35 Page 128

Water is an essential commodity for survival. What can we do to help increase water resources?

Planting trees would help in charging ground water as it checks the surface water flow and allows water more time to percolate through the soil to ground water. Trees are also helpful in making rainfall in a region.

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11

Air pollution is caused by transport exhaust fumes and emission of gases like SO2, CO2, NO2 from industies. Similarly, water pollution is caused by ________ .

 12

If wild animals are killed, what difficulty would we face?

 14

The tiger and the lion are carnivores. Likewise, the elephant and the bison are_____________.

 15

Assertion (A): Coal and petroleum are called fossil fuels.

Reason (R): Fossil fuels are formed from the remains of dead organisms after millions of years.