Why does iodine not stain the white border of the bordered geranium leaf blue?
| September 28, 2021 | education
The cells of the green part of the leaf contain chloroplasts containing chlorophyll. Sugar is formed in them, and then starch. In the cells of the white border of the leaf bordered geranium, there are no chloroplasts and, accordingly, there is no chlorophyll. Starch is not formed in these cells. And iodine turns blue only in the presence of starch.
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