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Significance of Photosynthesis

In Iodine-sta...

Question

In Iodine-starch test black colour of leaf indicates-

A

Presence of protein

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B

Absence of starch

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C

Absence of protein

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D

Presence of starch

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Solution

The correct option is B Absence of starch
b). In Iodine-starch test black colour of leaf indicates absence of starch.

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Similar questions

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

Q. A star-shaped figure was cut in the black paper strip used for covering the leaf of a destarched plant used for demonstrating that light is necessary for photosynthesis. At the end of the experiment when the leaf was tested for starch with iodine, the star-shaped figure on the leaf was found to be:

(1) colourless
(2) green in colour
(3) brown in colour
(4) blue-black in colour

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
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Q. State whether the following statements are true or false.
Statement 1: The iodine test helps us to detect the presence of starch in the leaf.
Statement 2: In the iodine test, the change in the blue-black colour of the leaf indicates the absence of starch.

Q. Appearance of red colour on adding iodine to the leaf indicates the presence of starch.

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