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Question

In the set up shown above, the role of potassium hydroxide and sodium bicarbonate is to ___ and ___ respectively.

A
provide necessary nutrients, absorb carbon-dioxide
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B
provide carbon-dioxide, absorb carbon-dioxide
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C
absorb carbon-dioxide, provide oxygen
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D
absorb heat from the plant, provide carbon dioxide
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Solution

The correct option is C absorb carbon-dioxide, provide oxygen
Potassium hydroxide in set up A absorbs all the carbon-dioxide inside the polythene bag and as a result, it fails to perform photosynthesis. Whereas, sodium bicarbonate in set up B provides carbon-dioxide which facilitates the process of photosynthesis. Thus, it proves that carbon-dioxide is necessary for photosynthesis.

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