Algae and other submerged aquatic plants float in water during day and sink at night

Come up for sunshine

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Loose weight at night as fish eat them

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Become light by photorespiration

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Become buoyant at day time due to trapped

O_{2}

that is consumed at night for respiration

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Solution

The correct option is D Become buoyant at day time due to trapped $O_{2}$ that is consumed at night for respiration
Algae and other submerged aquatic plants float in water during day and sink at night. This is because, during day time, algae and other submerged aquatic plants undergo photosynthesis which releases the $O_{2}$ as one of the end product which makes them float during day time. During night time, these organisms consume $O_{2}$ which is released during day time and sink at night.
So, the correct answer is option D.

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