Bio-indicators are used for knowing

Options :
  1. minerals
  2. oxygen demand
  3. air pollution
  4. all the above
Answer and Explanation :-

Answer: Option 4


Sorry there is no explanation for this answer. Please help others by posting your response below

How do you rate this queston?  Very Easy  Easy  Average  Above Average  Tough

Previous Question : Institution running with the help of FAO is

Next Question : Which one is being used as a source of bio diesel in the Indian country side

Click here for online test on Ecosystem


 (Getemail alerts when others member replies)

I mean she's Cleopatra... shouldn't she and Antony have known better? They were so different...""Variety is the spice of life""And from a thousand miles apart""Absence makes the heart grow fonder
-Ally Carter Uncommon Criminals