Question

The image given below shows a pond situated near an apple farm.
What could be the possible reason for death of fishes in the pond?

• A. The waste products given out by the plants.
• B. The practice of crop rotation in the farm.
• C. The use of biological control in the farm.
• D. The use of chemical fertilisers in the farm.

Answer 1

The correct option is D The use of chemical fertilisers in the farm.

• The fertilisers used in the apple farm can get washed away during rain and irrigation. They get deposited in the nearby water bodies, which in this case is the pond.
• Chemical fertilisers can cause serious problems, if they contaminate freshwater and marine ecosystems. The same nutrients in fertilisers that nourish crops, lawns and golf courses can cause rapid growth of algae in the water bodies.
• Dying algae in turn feed bacteria, which consume too much dissolved oxygen devoiding fish and plants of oxygen. Eventually leading to the death of aquatic organisms.