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In a village, farmers started cultivating crops all around a lake which was always filled with water. They added a lot of materials W to the soil in their fields to increase the yield of crops. Soon they found that the whole surface of the 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 A which had occurred in lake water and drained out all the Y present in the water of the lake. (a) What do you think materials W is? (b) Name (i) X, and (ii) Y. (c) What is the process Z known as? (d) What happens during the process A which uses up all the Y present in lake water? (e) What does this example tell us about the use of materials like W? |
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Answer» In a village, farmers started cultivating crops all around a lake which was always filled with water. They added a lot of materials W to the soil in their fields to increase the yield of crops. Soon they found that the whole surface of the 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 A which had occurred in lake water and drained out all the Y present in the water of the lake. |
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