Q. 44.2( 5 Votes )

A plant is kept i A. (a)

B. (b)

C. (c)

D. (d)

Answer :

For photosynthesis to occur, both sunlight and CO2 are required. The plant forms glucose (later on converted to starch) through photosynthesis. The part Q of leaf was covered and not exposed to light and part R was kept in absence of CO2. Thus, both parts of leaf did not form starch and gave a negative test for starch. (Note - iodine solution gives a positive test for starch and turns blue-black in colour)

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