Teaching BPSC बिहार प्राथमिक (1 to 5) शिक्षक भर्ती 4.0 Mock Test Environmental Studies Ecology Biogeochemical Cycle
Which of the following is not a biogeochemical cycle?
1
Ozone-cycle
2
Water-cycle
3
Nitrogen-cycle
4
More than one of the above
5
None of the above