Why do we use KOH in a bottle in the experiment to know CO2 is necessary for photosynthesis?

Why do we use KOH in a bottle in the experiment to know CO2 is necessary for photosynthesis?

  1. A

    To absorb chlorophyll present in leaves

  2. B

    To absorb air in the bottle

  3. C

    To absorb CO2 in bottle

  4. D

    To absorb water vapour in the bottle

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