A) Oxygen and nitrogen
B) Phosphorus and sulphur
C) Phosphorus and nitrogen
D) Phosphorus and carbon dioxide
Correct Answer: B
Solution :
[b] Biogeochemical cycles : Two types : (i) Gaseous: Biogenetic materials involved in circulation are gases e.g. \[{{N}_{2}},\]\[{{O}_{2}},\]\[C{{O}_{2}}\] etc. (li) Sedimentary: Biogenetic materials involved in circulation are non-gaseous e.g. P, Ca, S etc. forms rocks.
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