Which of the following is a fast-growing tree?

State the main purpose of water harvesting management and mention the source which fills the ponds behind harvesting structures.

To reduce the use of $LPG$ by making use of solar energy is an example of $......$

The three $R$'s that will help us to conserve natural resources for long-term use are:

Recycling is considered a welcome practice to deal with environmental problems. Justify this statement with two arguments.

In a village in Karnataka,people started cultivating crops all around a lake which was always filled with water. They added fertilisers to their fields 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 the excessive growth of plants and the death of fish in the lake.