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Give an experiment to prove that CO2 is ...

Give an experiment to prove that `CO_2` is necessary for photosynthesis.

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Two similar potted plants which are destarched are kept in sunlight covered with a glass jar. (1)
In side one jar "A" a plate containing KOH is kept. (1)
Both jars are sealed with Vaseline so that no air enters.
After sometime it is observed that the leaves of the plant near which KOH plate was kept , did not show test for starch as KOH absorbs `CO_2` (1)
This proves that `CO_2` is necessary for photosynthesis.
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