Given below are two statements. In the light of the above statements, choose the most appropriate answer from the options given below.
Statement I:The possibility of oxygen depletion is high in running and turbulent water bodies.
Statement II:Oxygen is added to water by the photosynthesis of green plants, algae and cyanobacteria.
ABoth Statement I and Statement II are correct
BBoth Statement I and Statement II are incorrect
CStatement I is correct but Statement II is incorrect
DStatement I is incorrect but Statement II is correct ✓ Correct
Correct answer: (D) Statement I is incorrect but Statement II is correct
Explanation
Statement 1 is incorrect, because running and turbulent water is well aerated, not oxygen poor.
Statement 2 is correct, as photosynthesis by green plants, algae and cyanobacteria adds oxygen.
Turbulence mixes air into water, so fast flowing streams hold more dissolved oxygen.
Still and stagnant waters are the ones prone to oxygen depletion.
During daylight aquatic plants release oxygen that dissolves into the water.
Warmer water and heavy organic pollution both lower the oxygen a water body can hold.
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