A destarched potted plant is kept in sunlight for 8 hrs as shown in the image below. After 8 hours, leaf C and D are plucked and iodine solution added. Which of the leaves will turn blue black after addition of iodine?

Both C and D

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Only C

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Only D

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Neither C nor D

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Solution

The correct option is B Only C
Plants need water, carbon dioxide, chlorophyll, and sunlight to photosynthesise.
KOH solution absorbs the carbon dioxide that is produced during respiration. In absence of carbon dioxide, leaf D is unable to photosynthesise and produce starch. In absence of starch, iodine remains yellowish brown.
Leaf C is able to photosynthesise and produce starch turning the leaf blue black after iodine is added.

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