Teaching BPSC बिहार प्राथमिक (1 to 5) शिक्षक भर्ती 4.0 Mock Test General Science Biology Ecology & Environment
Biological Oxygen demand (BOD) measures
1
The amount of oxidizable organic matter present in water body
2
The amount of oxygen dissolved in water, air and soil.
3
The amount of total inorganic matter present in water body
4
More than one of the above
5
None of the above