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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Explanation:
After the experiment, when the leaf us tested for starch using iodine solution, the Q part will be a bluish black, indicating the presence of starch. Explanation: However, the R portion will be brown in colour, since that part was not exposed to either sunlight or carbon dioxide
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