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Experiments Conducted to Prove the Formation of Starch in Plants

Arrange the s...

Question

Arrange the steps of iodine test in the correct sequence.
A. Boiling the leaf in alcohol
B. Washing the leaf in cold water
C. Boiling leaf in water
D. Adding iodine on the leaf

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Solution

The correct sequence is as follows :

Step 1 - C. Boiling leaf in water
Step 2 - A. Boiling the leaf in alcohol
Step 3 - B. Washing the leaf in cold water
Step 4 - D. Adding iodine on the leaf [2 Marks]

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Q. Given below are the steps to be followed for performing ‘starch test’ on a green leaf.
(A) Boil the leaf in alcohol
(B) Boil the leaf in water
(C) Dip the leaf in iodine solution
(D) Wash the leaf in water
Which one of the following sequences should the students follow to get the correct result?
(1) (A), (D), (B), (C)
(2) (D), (A), (B), (C)
(3) (B), (D), (A), (C)
(4) (B), (A), (D), (C)

Q. (a) why is the leaf boiled in alcohol for a short time?
(b) why do we dip the leaf in water before adding the iodine solution?

Q. In an experiment to test the presence of starch in a leaf, the leaf is boiled in alcohol for a few minutes using a water bath. This is an essential step in the experiment because alcohol:
(1) softens the leaf
(2) disinfects the leaf
(3) allows iodine to enter the leaf
(4) dissolves chlorophyll from leaf

Q. In an experiment to test the presence of starch in a leaf, the plucked leaf is first boiled in water for a few minutes. This is an important step in the experiment because it :
(1) converts glucose made in the leaf into starch
(2) dissolves chlorophyll present in the green leaf
(3) extracts starch to destarch the leaf
(4) makes the leaf more permeable to iodine solution

The correct sequence of starch test in leaf should be

(I) Removal of black paper strips, boiling in water, testing with iodine solution.

(ii) Removal of black paper strips, boiling in alcohol over water bath, washing the boiled leaf, testing with iodine solution.

(iii) Removal of black paper strips, boiling in iodine solution, washing with water.

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Experiments Conducted to Prove the Formation of Starch in Plants

Standard XI Biology

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