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Q15.

The excessive use of fertilizers increases the nutrient content of soil. If these nutrients find their way to a nearby lake, then it would result in the

A :

immediate death of all aquatic life

B :

immediate increase in fish population

C :

increase in the growth of aquatic vegetation

D :

increase in the amount of dissolved oxygen in water

Chemicals such as nitrogen and phosphorus are one of the major nutrients that plants need to grow and survive. Excess concentration of these chemicals in a lake will increase the growth of aquatic plants and may also cause algal blooms. This process is known as eutrophication.

The correct answer is C.

Why alternative A is wrong:

The increase in the amount of nutrients in a lake will trigger a rapid growth of algae, resulting in algal blooms. This algae will use up all the oxygen present in the water body, eventually leading to the death of all aquatic life.

Why alternative B is wrong:

The increase in the amount of nutrients in a lake will trigger a rapid growth of algae, resulting in algal blooms. This algae will use up all the oxygen present in the water body. As a result, the number of fishes present in the lake will decrease.

Why alternative D is wrong:

The increase in the amount of nutrients in a lake will trigger a rapid growth of algae, resulting in algal blooms. This algae will use up all the oxygen present in the water body. As a result, the dissolved oxygen content in water will decrease.

why is Option A wrong and Option C correct???????????

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