5. Reena studied that there are some material which are beneficial for soil and some are harmful to soil. Which materials
are harmful to soil? a) different types of weeds b) chemical c) insecticides d) all of above
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5. Reena studied that there are some material which are beneficial for soil and some are harmful to soil. Which materials
are harmful to soil? a) different types of weeds b) chemical c) insecticides d) all of above
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Answer:
d. all of these
Explanation:
weeds are unwanted plants that take the fertility of soil
chemical make the soil polluted
insecticide take away the fertility of soil and make it polluted
This would affect in case of plants
So, a) must be the answer