An ecologist studied the effects of sewage effluent on the levels of oxygen concentration, bacterial population and algal growth in a fresh water stream. The given graph is plotted based on his findings.
select the correct statement regarding the given graph.

There is a fall in oxygen concentration between point Y and 4 km downstream because it is utilized by algae for respiration during day.

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There is a rise in oxygen concentration between 4 km and 8 km downstream because of oxygen for respiration is lower

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Bacterial population never recovers from 8 km onwards because all the oxygen is used by algae

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There is decrease in the level of bacteria between 5 km and 7 km downstream because all the oxygen and organic matter has been used up by algal population

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Solution

The correct option is B There is a rise in oxygen concentration between 4 km and 8 km downstream because of oxygen for respiration is lower
There is a rise in oxygen concentration between 4 km and 8 km downstream because bacterial usage of oxygen for respiration and for decomposition is lower.

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An ecologist studied the effects of sewage effluent on the levels of oxygen concentration, bacterial population and algal growth in a fresh water stream. The given graph is plotted based on his findings.select the correct statement regarding the given graph.

The correct option is B There is a rise in oxygen concentration between 4 km and 8 km downstream because of oxygen for respiration is lowerThere is a rise in oxygen concentration between 4 km and 8 km downstream because bacterial usage of oxygen for respiration and for decomposition is lower.

An ecologist studied the effects of sewage effluent on the levels of oxygen concentration, bacterial population and algal growth in a fresh water stream. The given graph is plotted based on his findings.
select the correct statement regarding the given graph.

The correct option is B There is a rise in oxygen concentration between 4 km and 8 km downstream because of oxygen for respiration is lower
There is a rise in oxygen concentration between 4 km and 8 km downstream because bacterial usage of oxygen for respiration and for decomposition is lower.