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Reported Question / Answer
Q.) Algae often float on surface of water during the day but sink down during the night due to
1)
evolution and trapping of oxygen bubbles during the day in their photosynthesis
2)
becoming light as they consume most of their food in the night
3)
warming action of sun during the day
4)
release of absorbed air by warming of water
5)
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Answer :
1
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