Please answer question number 6a

Dear Student 

6 (a)
i) To show that light is essential for photosynthesis.
ii) Sequence should be Q, P and R.
iv) Few drops of iodine solution are poured on the leaf to test the presence of starch. Blue-black region shows the presence of starch. The leaf turns blue-black except in the covered region. As this covered region did not receive light, photosynthesis did not occur, no starch was formed there. The uncovered region received light and starch was formed there due to photosynthesis.

**For rest please post separately. 


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