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Question
What will be the result of the starch test performed on leaf 'A' shown in the diagram? Give an example of a plant with variegated leaves.
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Solution
- The given experiment proves that for photosynthesis, the presence of sunlight is an important factor which is absorbed by the chlorophyll (green pigment) present in the chloroplast.
- The leaf from a potted plant which was kept in a dark room for 24 hours when tested for starch will not turn blue-black (starch is tested with iodine which gives a blue-black colour if present).
- This happens because when the potted plant was kept in a dark room (destarch), the plant was unable to prepare its food by photosynthesis.
- So, the leaf A will give a negative test for starch.
- Variegated leaves are those which have one colour on the inner region of the foliage and another colour along the edges or margin of the leaf.
-
Example
of a plant with a variegated leaf is Cornus alba
Elegantissima.
- The given experiment proves that for photosynthesis, the presence of sunlight is an important factor which is absorbed by the chlorophyll (green pigment) present in the chloroplast.
- The leaf from a potted plant which was kept in a dark room for 24 hours when tested for starch will not turn blue-black (starch is tested with iodine which gives a blue-black colour if present).
- This happens because when the potted plant was kept in a dark room (destarch), the plant was unable to prepare its food by photosynthesis.
- So, the leaf A will give a negative test for starch.
- Variegated leaves are those which have one colour on the inner region of the foliage and another colour along the edges or margin of the leaf.
-
Example of a plant with a variegated leaf is Cornus alba Elegantissima.
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