A)
Bacterial count Oxygen level Number of green plants Number of animals Low High Few Few
B)
Bacterial count Oxygen level Number of green plants Number of animals High Low Few Many
C)
Bacterial count Oxygen level Number of green plants Number of animals High Low Few Few
D)
Bacterial count Oxygen level Number of green plants Number of animals Low High Many Many
Correct Answer: D
Solution :
Wastes thrown in the rivers cause water pollution. In the most polluted river, bacteria] count will be high as these bacteria will decompose the waste present in water. This will lead to low level of dissolved oxygen in water as oxygen is required for decomposition. This will adversely affect the number of green plants and animals in the river. In an unpolluted river, the conditions are reversed.
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