Question

Algae and other submerged green plants often float in water during daytime and sink at night because

• A. Trapping of oxygen bubbles during the day in their photosynthesis
• B. Release of absorbed air by warming of water
• C. They become light due to the consumption of food
• D. They come up to enjoy sunshine

Answer 1

The correct option is A Trapping of oxygen bubbles during the day in their photosynthesis

Algae and other submerged green plants often float in the water during daytime and sink at the night because at the daytime plants follow photosynthesis and produce oxygen. This oxygen is trapped in bubbles and lift the clump up to the surface whereas at the night time this oxygen is used in respiration and produces carbon dioxide.

So, the correct answer is 'Trapping of oxygen bubbles during the day in their photosynthesis'.