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B
Chlorophyll is essential for photosynthesis.
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C
CO2 is essential for photosynthesis.
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D
Light is essential for photosynthesis.
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Solution
The correct option is CCO2 is essential for photosynthesis. Moll's half-leaf experiment proves that CO2 is essential for photosynthesis. A part of the leaf is enclosed in a test tube containing KOH absorbed cotton. KOH absorbs CO2, while the other half is exposed to air. This setup is placed under light for some time and a starch test is carried out. The half portion inside the tube tested negative for starch as there was no CO2 which is required for photosynthesis.