Q.

Algae float on water during day time and sink during night time because

Moderate

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By Expert Faculty of Sri Chaitanya

a

they become light due to consumption of food material in respiration.

b

they become buoyant in light due to the accumulation of oxygen bubbles released in photosynthesis.

c

of accumulation of organic acids at night.

d

of change in temperature.

answer is 2.

(Detailed Solution Below)

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Detailed Solution

During day time they release oxygen from water as bubbles that make them float on the surface of water. During night, there is no release of oxygen and they go down into the water.
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