Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test General Science Chemistry Chemistry in Everyday Life
Lichens are the major pollution indicator of:
1
Sulphur dioxide
2
Nitrous oxide
3
Suspended particulate matter
4
More than one of the above
5
None of the above