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    Question

    Algae often float on surface of water during day but

    sink during night due to:┬а┬а
    A evolution and trapping of oxygen bubbles during the day in their photosynthesis process Correct Answer Incorrect Answer
    B Becoming light as they consume most of their food in the night Correct Answer Incorrect Answer
    C warming action of sun during the day Correct Answer Incorrect Answer
    D Release of absorbed air by warming of water Correct Answer Incorrect Answer

    Solution

    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 COтВВ ┬аis produced. So algae sinks.┬а

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