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Bhavna
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Asked: 2021-06-20T10:21:00+00:00 In:

A part of de-starched leaf of a potted plant was covered with black paper strips on both sides and the plant was kept in sunlight for 8 hours. The leaf was then tested with iodine after boiling it in alcohol. Only the uncovered part of the leaf turned blue black. The inference is that:

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Poll Results

14.29%(a) CO₂ is necessary for photosyrrthesis. ( 3 voters )
66.67%(b) Light is necessary for photosynthesis. ( 14 voters )
14.29%(c) Chlorophyll is necessary for photosyrthesis ( 3 voters )
4.76%(d) Water is necessary for photosymthesis. ( 1 voter )
Based On 21 Votes

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      (b) Because all other parts of the leaf had same resources available other than light, which was, present only in exposed parts. These parts showed presence of starch thereby proving that light is necessary for photosynthesis.

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