NTA Abhyas NEET2020BotanyBiological ClassificationPractice
Scum floats on the surface of the water because
Options
- AThe density of cells is more than that of water
- BOxygen accumulates in it
- CH 2 S accumulates in it
- DIt generates methane gas
Correct answer
B. Oxygen accumulates in it
Step-by-step solution
As many algal cells have gas vesicles which allow them to undergo vertical migration in the water column as a response to light conditions. Photosynthesis during day time causes the release of oxygen that makes their body buoyant.