Activity : Experimental Investigation - Chlorophyll is necessary for photosynthesis
1. The leaves of plants, such as Coleus and Croton, are partly green and partly non - green. They are known as variegated leaves.
2. Chlorophyll is present only in their green portions.
3. Select such a leaf from a plant that has been exposed to sunlight for a few hours and draw its outline on a sheet of paper.
4. Indicate the green and non-green areas on the drawing.
5. Test the leaf for starch.
6. Compare the parts stained blue - black with the drawing.
7. Which parts of the leaf turn blue - black?
8. Why does the non - green portion not show the presence of starch?
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