No, all the starch stored in the leaf would have been used up by the plant. No starch would be synthesised afresh due to non-availability of sunlight.
Question
Will a leaf taken from a potted plant kept in a dark room for a few days turn blue–black when tested for starch? Give reasons for your answer.
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💡 Some Related Questions
Observe the picture of an activity given below carried out with leaves of plants and polythene bag. 
Now answer the following: (i) Which process is demonstrated in the activity? (ii) When will this activity show better results—on a bright sunny day or a cloudy day?(iii) What will you observe in the polythene bag after a few hours of setting up the activity? (iv) Mention any one precaution you must take while performing this activity.
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(i) Label the parts (a), (b), (c) and (d) in the diagram.(ii) What type of venation does the leaf has?(iii) What type of venation is seen in grass leaves? 