What substance is gives plants their green color?
Chlorophyll is the chemical pigment that reacts with sunlight to conduct photosynthesis, enabling a plant to make foodYou can see the results of changes in daylight length (summer vs autumn) with the color changes in many leaves An easy experiment can show how chlorophyll is needed for photosynthesisSome plants have variegated leaves with white and green areasTake such a plant and put it in the dark for a few daysTake a leaf and make a mask to cover it out of aluminium foilCut two holes (one round, one square)in the foil such that one hole exposes a green part of the leaf and the other a white part of the leafPlace the leaf in the light for an hour or soIf the leaf is exposed to a solution of iodine the green part of the leaf exposed to the light will show up black and the white part will not stain blackFurthermore, the black patch will have the same shape as the hole that you had cut in the foilThe iodine-stained starch only piles up in areas of the leaf that were green, showing that only those areas are photosyntheticThis proves that photosynthesis doesn't occur in the areas where there was no chlorophyll.
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