| (i) The biological oxygen demand value of the water decreases |
| (ii) Instant death of certain organism |
| (iii) The population of algae increases |
| (iv) The concentration of dissolved oxygen increases |
A) Only (i) and (ii)
B) Only (ii) and (iii)
C) Only (i), (ii) and (iii)
D) Only (i),(ii) and (iv)
Correct Answer: D
Solution :
Electrical power stations use water to make steam to run the turbines and generate electricity. The used steam or superheated water which is of no use is released directly into water bodies. As aquatic animals are cold blooded, they cannot withstand excess heat and die. Aquatic plants carry out photosynthesis and release oxygen into the water. They too die and cause a decrease of oxygen in water. Points (iii) and (iv) are caused due to eutropication.
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