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Question
Which of the following attributes differentiate fertilisers and manure?
Options:
A .  Increase of crop yield
B .  Direct cause of water pollution
C .  Increase water holding capacity of soil
D .  Improvement of soil structure
Answer: Option B
:
B
Manures are the organic substances obtained by the decomposition of animal excreta and plant waste. Adding manure is a natural way of increasing soil fertility and in turn increasing yield.
Fertilisers are artificially synthesised inorganic salts which also increase yield. Excessive use of fertilisers kill the micro-organisms present in the soil. Theyrunoff into the nearby water bodies which wouldresultin water pollution.

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