Bioindicators

Q. Statement 1 : BOD represents the amount of dissolved oxygen that would be consumed if all the organic matter in one litre of water were oxidised by microorganisms.
Statement 2 : High value of BOD indicates that water is highly polluted by organic matter.

1. Both statements 1 and 2 are correct.
2. Statement 1 is correct but statement 2 is incorrect.
3. Statement 1 is incorrect but statement 2 is correct.
4. Both statements 1 and 2 are incorrect.

Q. Why lichens do not occur in Delhi whereas they commonly grow in Manali or Darjeeling?

Q. Rhizobium fixes nitrogen by

1. Converting gaseous nitrogen to ammonia
2. Converting gaseous nitrogen to nitrite
3. Converting gaseous nitrogen to nitrate
4. None of the above