Q. Many algae often float in the water in the day hours and sink in the night. Why this happens?
- Evolution and trapping of oxygen bubbles in day hours due to Photosynthesis
- They consume food in the day and become light
- In daytime, the water gets warmed and its density becomes low
Which among the above is/ are correct?
Answer:
Only 1
Notes: The reason of algae float to the surface during the day & sink at night is due to photosynthesis. In Day time, the algae is producing oxygen. When enough Oxygen is produced during the day , it gets trapped in bubbles and it can lift the clumps up to the surface. In night, this oxygen is consumed and CO2 is produced. So algae sinks.