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A star-shaped figure was cut in the black paper strip used for covering the leaf of a destarched plant used for demonstrating that light is necessary for photosynthesis.

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A star-shaped figure was cut in the black paper strip used for covering the leaf of a destarched plant used for demonstrating that light is necessary for photosynthesis. At the end of the experiment when the leaf was tested for starch with iodine, the star-shaped figure on the leaf was found to be

(1) colourless

(2) green in colour

(3) brown in colour

(4) blue-black in colour

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Correct answer: (4) blue-black in colour

Explanation:

The star shaped figure would be found to be blue black in colour indicating the presence of starch in that area.

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