1.

Question : Algae and other submerged green plants often float in water during daytime and sink at night.

Answer»

They LOSE weight at night because fish and other animals eat away at their parts.
They become BUOYANT DUE to accumulation of oxygen as a result of photosynthesis,
They become light due to CONSUMPTION of food.
The come up to ENJOY sunlight. 

Answer :B


Discussion

No Comment Found