Question

Priyanka took a potted plant and kept it in dark for two days. She covered the middle part of a
leaf with a black paper and kept the plant in the sunlight for a day. (2)
a) What would be the colour of the leaf covered with black paper?
b) If the starch test is performed on the covered part of this leaf, will it change to blue-black
colour? Explain.

Answer 1

a) If the plant's leaves are covered with black paper the imp process for the life of plant i.e. photosynthesis will not occur in that area (leaves). If all the leaves are covered as such then the plant will ultimately go to senescence i.e. death. Moreover the chlorophyll present in the leaves will be of no use as photosynthesis will not take place as it needs sunlight and hence there will be no food for the plant

b) Now pluck the leaf, remove the black paper and perform the iodine test. You will observe that the uncovered portion of the leaf turns blue black colour because of the presence of the starch, while, the covered portion of leaf does

Now pluck the leaf, remove the black paper and perform the iodine test. You will observe that the uncovered portion of the leaf turns blue black colour because of the presence of the starch, while, the covered portion of leaf doesnot become blue-black.

Answer 2

Answer:

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Explanation: