Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test General Knowledge Ecology and Environment Ecology and Functions of an ecosystem
Nitrogen fixation is done by:
1
Lightening
2
Fixing Bacteria
3
Fertilizer
4
More than one of the above
5
None of the above