A plant us kept in dark for two days. A leaf is used in an experiment to investigate the effect of two factors on photosynthesis are shown in the given diagram. What will be the colours of Q and R, when the leaf is tested for starch, using iodine solution ?

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Answer:Putting the plant in dark for 48 hours would stop the process of photosynthesis as light is required for it. Photosynthesis produces organic sugars which are stored in form of starch in plants. The absence of photosynthesis would lead to consumption of all stored starch making the leaf starchless. The correct answer is option D.
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i. Q will have blue black colour as it was exposed to sunlight.
ii. R will have brown colour as it had no carbon dioxide and sunlight.
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