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Which of the following statements shows the correct results of Iodine Test performed on the leaf from plant X and Y respectively?
(A) Blue - black colour would be obtained on the leaf of plant Xand no change in colour on leaf of plant Y.
(B) Blue - black colour would be obtained on the leaf of plant Y and no change in colour onleaf of plant X.
(C) Red colour would be obtained on the leaf of plant X and brown colour on the leaf of plant Y.
(D) Red colour would be obtained on the leaf of plant Y and brown colour on the leaf of plant X.
Answer -
An Iodine test is used to detect presence of starch in the leaf
- If putting Iodine solution turns the leaf into blue-black , it means starch is present
- If there is no blue-black color, no starch is present
From our experiment
- In Plant X does not have Carbon Dioxide, so starch will not be present. Thus, it will not turn blue black
- In Plant Y, since there is Carbon Dioxide, so starch is present. Thus, it will turn blue black
So, the correct answer is (b)
