Phosphate containing fertilisers cause water pollution. Addition of such compounds in water bodies causes __________.
(i) enhanced growth of algae.
(ii) decrease in amount of dissolved oxygen in water.
(iii) deposition of calcium phosphate.
(iv) increase in fish population.
The answer is the option (i) enhanced growth of algae & (ii) decrease in the amount of dissolved oxygen in the water
Explanation: Phosphate enhances algae growth when added in water, and this algae growth covers the water surface and decreases the amount of dissolved oxygen in the water.