Iodine test is done to test the presence of starch. In presence of starch the iodine solution changes into blue black colour. Imagine a scenario where two potted plants are taken and one is kept in sunlight and another is kept in the dark for 3 to 4 days. We than take the leaves of these plants and perform the iodine test. What will be your conclusion. *
1 point
Both leaves will give the blue black colour
Neither of the leaves will show change in colour
The leaves of the plants kept in light shows change in colour of iodine solution.
The leaves of the plant kept in the dark shows change in colour of the iodine solution.
Answers
Answer:
The leaves of the plants kept in light shows change in colour of iodine solution.
Explanation:
When leaves are kept in sunlight, photosynthesis will occur and starch will be produced.
But when leaves are kept in dark, their life processes will utilise the energy from starch. So all the starch will get utilised and extra starch can't be produced as photosynthesis doesn't occur in the absence of sunlight. The leaves are said to be destarched.
Answer:
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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