Biochemical Oxygen Demand, (BOD) is a measure of organic material present in water. BOD value less than 5 ppm indicates a water sample to be __________.
(i) rich in dissolved oxygen
(ii) poor in dissolved oxygen.
(iii) highly polluted.
(iv) not suitable for aquatic life.

Answer: Option (i)
Solution:
Biochemical Oxygen Demand (BOD) is a measure of the amount of oxygen required by bacteria to break down the organic matter present in a certain volume of a water sample.
A BOD value less than 5 ppm indicates that the water sample is rich in dissolved oxygen, which means that it has a high concentration of oxygen dissolved in it. This is because the organic matter in the water has been broken down by bacteria, which consume oxygen during the process. Therefore, a low BOD value indicates that the water is clean and suitable for aquatic life.
On the other hand, a high BOD value indicates that the water is poor in dissolved oxygen, which means that the organic matter in the water has not been broken down and is consuming the available oxygen. This can lead to the death of aquatic life and is an indicator of highly polluted water.

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