Explanation:
answer for Q7
Why is excess use of fertilizers detrimental for environment?
answer
Excess use of fertilizers causes environmental pollution as their residual
and unused amounts
become pollutants for air, water and soil,by causing eutrophication in the water bodies, decreasing the soil quality by killing the soil microflora etc.
Hence, excess use of fertilizers is detrimental to the environment.
Q8
What Is a Genetically Modmed Croos (GMCs)? Name any one such crop
answer
Crop which has been developed by introducing a new gene from any other source, to obtain the desired character, is called as genetically modified (GM) crop. Bt Cotton is an example of GM crop which is made insect resistant by introducing a gene from a bacteria, Bacillus thuringiensis.
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