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Experiments conducted to prove the formation of starch in plants

The leaf is b...

Question

The leaf is boiled in alcohol to remove _______ (chlorophyll/starch).

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Solution

Starch test:
In the starch test, Iodine is used to detect the presence of starch.
Iodine changes its colour in the presence of starch.
But to see the change in colour it is necessary to remove the green colour of leaves due to chlorophyll.
Therefore, leaves are boiled in alcohol to remove chlorophyll, so that the change in colour of iodine can be prominently visible.
Final answer: The leaf is boiled in alcohol to remove chlorophyll.

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Q. When carrying out the starch test on a leaf, why is it important to boil the leaf in alcohol?
(a) to dissolve the waxy cuticle
(b) to make the cells more permeable to iodine solution
(c) to remove the chlorophyll
(d) to stop chemical reactions in the cells.

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

Q. In the experiment to demonstrate that starch is made as food by the process of photosynthesis, the plucked leaf is first boiled in water for about 3 to 5 minutes in order to :

(1) remove chlorophyll from leaf cells

(2) break down the cell membranes of leaf cells

(3) soften the brittle leaf

(4) convert starch into glucose so that is can be tested easily

Q. The leaf is boiled in alcohol to remove chlorophyll . What other liquids other than alcohol can be used

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Experiments conducted to prove the formation of starch in plants

Standard VIII Biology

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