Totally submerged aquatic plants can cause a pH change in the surrounding water when they carry out photosynthesis. What pH change happens and what cause it?

The pH falls because carbon dioxide is absorbed

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The pH rises because carbon dioxide is absorbed

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The pH falls because oxygen is released

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The pH rises because oxygen is released

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Solution

The correct option is B The pH rises because carbon dioxide is absorbed
The pH is the measure of H $^{+}$ ions in the medium. Carbon dioxide in water exists in the form of carbonic acid that soon dissociates into H $^{+}$ and bicarbonate ions. Submerged plants performing photosynthesis will absorb these ions and so it will reduce the pH of the water. It will become more due to the absence of carbon dioxide.
Hence, the correct answer is 'The pH rises because carbon dioxide is absorbed'

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