| (i) Submerged algae perish |
| (ii) Water plants undergo sudden proliferation |
| (iii) Consumers such as fish die |
| (iv) Oxygen levels fall |
| (v) Bacteria act on the increased number of dead organisms. |
A) (ii)\[\to \](i)\[\to \](iii)\[\to \](v)\[\to \](iv)
B) (iii)\[\to \](iv)\[\to \](i)\[\to \](ii)\[\to \](v)
C) (ii)\[\to \](i)\[\to \](v)\[\to \](iv)\[\to \](iii)
D) (i)\[\to \](iv)\[\to \](v)\[\to \](iii)\[\to \](ii)
Correct Answer: C
Solution :
The farmers use fertilisers in the field to increase the yield of crops. These fertilisers are washed off by rain into nearby water sources and causes rapid growth of algae. The algae grow so well by taking fertilisers and cover the whole surface of water like a green sheet. The proliferation of algae results in decrease of oxygen level in water. When the algae complete their life cycle and die, bacteria decompose the huge mass of dead algae by using the dissolved oxygen of water in the water body. Due to this, the amount of dissolved oxygen in the water source decreases too much and the fish living in this water die due to oxygen starvation.
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