1 Draw a well labelled diagram to show carbon cycle in nature.
2What causes acid rain?
3What is humus? What is its function in the soil?
4What is biological fixation? How is it different from nitrification? Give an E.g. Of organism involved in each of these?
5What is contribution of photosynthesis in carbon cycle?
6Draw a well labelled diagram to show N2 cycle in nature?
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