Which experiment shows that CO2 is essential for photosynthesis?
AMohl's experiment with hydrogen and chlorine
BStarch test with iodine on a green leaf
CHalf-leaf experiment using potassium hydroxide
DGanong's potometer experiment with cut shoots
Answer & Solution
Correct answer: C. Half-leaf experiment using potassium hydroxide
1. The half-leaf experiment encloses part of a leaf in a flask with KOH.
2. KOH absorbs the CO2 around that half.
3. After light exposure, only the half outside the flask makes starch.
4. This proves CO2 is required.
_Source: Selina Concise Biology Class 10, Ch on Photosynthesis (Mistral OCR'd PDF), section on half-leaf experiment_
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