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A potted plant with a variegated leaf is kept in the dark and then in sunlight, and the leaf is tested with iodine. Starch is found
Your answer:
Correct answer: (b)
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Explanation
Why (b) is correct
In a variegated leaf, only the green parts have chlorophyll. After de-starching in the dark and exposure to light, starch is found only in the green parts, showing that chlorophyll is needed.
Why the other options are wrong
- (a) · your answer The green parts do photosynthesise and form starch.
- (c) · your answer The white parts lack chlorophyll and cannot make starch.
- (d) · your answer The white parts lack chlorophyll, so they have no starch.
NCERT point: Simple experiments with variegated leaves show the need for chlorophyll.
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Practise Photosynthesis in Higher Plants
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