Question

A part of leaf is enclosed in a
test tube containing some KOH soaked cotton (which absorbs CO2) while the other half is exposed to air. On testing for the presence of starch later in the two parts of the leaf you must found that the exposed part of the leaf tested positive for starch while the portion that was in the tube tested negative . this showed that _________ was required for photosynthesis.
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Answer 1

So the correct option is 'carbon dioxide is essential for photosynthesis because in KOH leaf, starch synthesis do not occur as CO2 is absorbed by KOH, so CO−2 is not available for photosynthesis'.

Answer 2

Answer:

I think the answer should be correct