Question

Explain with an activity importance of sunlight for the process of photosynthesis

Answer 1

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Aim: light and chlorophyll are necessary for photosynthesis.

Apparatus: destarched cotton plant, black paper, apparatus for starch testing like iodine solution.

Working: take a destarched cotton plant with variegated leaves ( leaves with green and non green patches). Cover one leaf with black paper. place the potted plant in the sunlight. After two hours, pluck the uniluminated leaf and one illuminated leaf. Test for both the leaves for starch.

Observation: The darkened or unilluminated leaf does not show any blue-black patch. The whole leaf appears yellowish after iodine test. The illuminated leaf posses both blue-black and yellow patches. The blue patches corresponds to green areas while yellow patches are the ones which are previously non green in a variegated leaf.

Inference: Presence of bluish-black patches in illuminated leaf and their absence in darkened leaf clearly indicates that LIGHT IS NECESSARY FOR PHOTOSYNTHESIS. In illuminated leaf only green or chlorophyll bearing parts appear buish-black showing that CHOLOROPHYLL IS NECESSARY FOR PHOTOSYNTHESIS. The nongreen patches do not perform photosynthesis.

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