Question

The farmers use large amounts of a substance P in the fields to increase the crop yield.

The excess of P dissolves in water and runs into a lake. The substance P causes rapid

growth of tiny green water plants Q in the lake which cover the whole lake like a green

sheet. When the plants Q die, the organisms called R decompose them by utilizing S

dissolved in lake water. The amount of dissolved S in water decreases too much due to

which the fish living in the lake suffocate and die.

What are P, Q R and S? Name this process​

Answer 1

The substance P is Fertilizer. The fertilizers act as nutrients for the algae to grow. When these algae die, they act as a nutrient for decomposers like bacteria. As a result of this process, a lot of oxygen in the water gets used up and leads to the deficiency of Oxygen in the water.

Answer 2

Answer:

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