In a village in Karnataka, people started
cultivating crops all around a lake which was
always filled with water. They added fertilizers
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.
Analyze the situation and give reasons for
excessive growth of plants and death of fish in
the lake.

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Solution

Fertilizers :
Fertilizers are chemical substances that are
added to the soil to increase a crop’s
productivity.

In the given situation, since people used
excessive fertilizers in their fields, these got
carried down to the lake along with rains. As
fertilizers contain phosphates and nitrates, the
water body became enriched with these
chemicals.

The chemicals aided excessive growth of
aquatic plants and algae, while taking away
essential nutrients and oxygen from the water,
causing the fish in the lake to die.

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Question 27
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.
Analyze the situation and give reasons for excessive growth of plants and death of fish in the lake.

Q. In a village, farmers started cultivating crops all around a lake which was always filled with water. They added lot of materials W to the soil in their fields to increase the yield of crops. Soon they found that the whole surface of water in the lake was covered with a green layer made up of tiny organisms X. After some time, the fish present in the lake started dying in large numbers because they could not get sufficient Y due to a process Z which had occurred in lake water and drained out all the Y present in the water of lake.
(a) What do you think materials W are?
(b) Name (i) X, and (ii) Y.
(c) What is the process Z known as?
(d) What happens during the process Z which uses up all the Y present in lake water?
(e) What does this example tell us about the use of materials like W?

In a village in Karnataka, people started cultivating crops all around a lake that was always filled with water. They added fertilizers 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. Analyze the situation and give reasons for the excessive growth of plants and the death of fish in the lake.

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