Two lakes, A and B are identical in all aspects except that lake A has higher temperature. Which of the following is true?

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A has higher rate of oxygen dissolution.

B has higher rate of oxygen dissolution.

Oxygen dissolution of both is the same.

Both the lakes have same BOD.

answer is B.

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Detailed Solution

Lake B has more dissolved oxygen in the water than lake A. Lake A is formed before lake B.The new lake is cold and has more dissolved oxygen. As the silt and organic debris piles up and warm- water organisms start growing, then the water becomes warm and the dissolved oxygen in the water decreases.

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