I. Lots of urea and phosphate fertilizer were used in the crops in the vicinity. |
II. The area was sprayed with DDT by an aircraft. |
III. The lake water turned green and stinky. |
IV. Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis. |
A) II, III
B) III, IV
C) I, III
D) I, II
Correct Answer: C
Solution :
Presence of large amounts of nutrients in waters causes excessive growth of planktonic (free floating) algae, called an algal bloom, which imparts a distinct colour to the water bodies. Algal blooms cause deterioration of the water quality and fish mortality.You need to login to perform this action.
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