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11.Organisms and Populations
normal
Crop rotation is helpful because
A
It gives more nitrates in the soil
B
It gives more sulphates in the soil
C
It gives more nitrogen in the soil
D
It gives more phosphorus in the soil
Solution
(a)If the same crop is grown year after year, fertility of soil is lost due to utilization of same minerals again and again, thus disturbing the soil structure, which facilitates soil erosion. Legumes are useful in rotation of crops because of having nodulated roots and it gives more nitrates in the soil.
Standard 12
Biology
