Question

Algae often float on surface of water during day but sink down during night due to

• A. Evolution and trapping of oxygen bubbles during the day in their photosynthesis.
• B. Becoming light as they consume most of their food in the night.
• C. Warming action of sun during the day.
• D. Release of absorbed air by warming of water.

Answer 1

The correct option is A Evolution and trapping of oxygen bubbles during the day in their photosynthesis.

Algae often float on the surface of the water during the day but sink down during the night due to the photosynthesis as many algae liberate oxygen bubbles during daytime which get trapped in bubbles and it can lift the clamps to the above surface. during night respiration occurs and oxygen is consumed so they sink.

So the correct option is 'Evolution and trapping of oxygen bubbles during the day in their photosynthesis.'.