Question

The excessive use of one of the following in agriculture can cause the death of fish in a pond by oxygen starvation. This one is:
A. fertilizers
B. manures
C. pesticides
D. herbicides

Answer 1

Answer:

Fertilizers is the answer

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. This may kill the aquatic organisms

Answer 2

Excessive use of A. Fertilisers in agriculture can cause the death of fish in a pond by oxygen starvation.

Explanation:

• The release of water with high amount of fertilisers in it lead to overgrowth of algae on the surface of the water.
• The rapid growth of algae on the surface of the water causes eutrophication.
• This shades sunlight for the plants under the water.
• The algae absorbs oxygen from the water. This causes lack of oxygen to fishes.
• This eventually kills the fishes and plants under the water and destroying the ecosystem of that particular lack.