Discussion
There is a relationship of D.O. and free \(\mathrm{CO_{2}}\) in water, which one of the following is correct ?
Answer: D
The correct relationship is low D.O. and high free \(\mathrm{CO_{2}}\).
Dissolved oxygen and free carbon dioxide usually vary inversely. Where organic pollution is decomposed by bacteria, respiration uses up oxygen and releases carbon dioxide, so polluted water has low D.O. and high free \(\mathrm{CO_{2}}\). Where algae photosynthesise in daylight, they use carbon dioxide and release oxygen, giving the reverse.
Both high, both low, or both equal would ignore the fact that the same processes produce one gas while consuming the other.
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