Teaching UP B.Ed (Paper 1 & 2) Mock Test 2025 General Science Biology Ecology & Environment

B.O.D. কীসের সাথে সম্পর্কিত?

1
জৈব পদার্থ
2
অণুজীব
3
উভয় (1) এবং (2)
4
এর কোনটিই নয়
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