Question 84: Given below are two statements :
Statement I : The nutrient deficient water bodies lead to eutrophication.
Statement II : Eutrophication leads to decrease in the level of oxygen in the water bodies.
In the light of the above statements, choose the correct answer from the options given below :
(1) Statement I is correct but Statement II is false.
(2) Statement I is incorrect but Statement II is true.
(3) Both Statement I and Statement II are true.
(4) Both Statement I and Statement II are false.
Answer: Option (2)
Explanation:
Eutrophication occurs due to excessive enrichment of water bodies with
nutrients such as nitrates and phosphates.
Therefore, nutrient rich water bodies, and not nutrient deficient ones,
lead to eutrophication. Hence, Statement I is incorrect.
Eutrophication causes excessive growth of algae and aquatic plants.
When these organisms die, their decomposition by bacteria consumes a large
amount of dissolved oxygen present in water.
This results in a decrease in the level of oxygen in the water bodies,
making Statement II correct.
Thus, Statement I is incorrect but Statement II is true,
and the correct option is (2).