what is the main cause of death for fish in water bodies polluted by fertilizers?
a) decreased nutrition levels for algae
b) decrease in oxygen levels
c) increased water temperature
d) decrease in number of bacteria
Answers
Answer:
b is correct answer
Explanation:
because growth of fungi will utilise more dissolved oxygen
The main cause of death for fish in water bodies polluted by fertilizers is a decrease in oxygen level (option B).
Fertilizers are a source of high nutrition for algae, so when water bodies are polluted by fertilizers it makes the water nutrition-rich. This leads to algae blooming in water. A layer of algae growth can be seen on the surface of water covering the whole surface.
Due to these algae blooming the surface of water gets covered and this leads to a decrease in penetration of sunlight and dissolving of oxygen in the water.
Apart from this the algae also consume the oxygen present in the water leaving less oxygen for fishes. Hence, fishes present in the water die due to a decrease in oxygen levels.