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In an experiment to test the presence of...

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:

A

converts glucose made in the leaf into starch

B

dissolves chlorophyll present in the green leaf

C

extracts starch to destarch the leaf

D

makes the leaf more permeable to iodine solution

Text Solution

Verified by Experts

The correct Answer is:
D
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How will you test for the pesence of starch in a leaf?

Boojho wanted to test the presence of starch in leaves. He performed the following steps. He took a leaf and boiled it in water. He did not get the expected result. Which step did he miss? Explain.

Knowledge Check

  • 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:

    A
    softens the leaf
    B
    disinfects the leaf
    C
    allows iodine to enter the leaf
    D
    dissolves chlorophyll from leaf

  • 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 :

    A
    remove chlorophyll from leaf cells
    B
    break down the cell membranes of leaf cells
    C
    soften the brittle leaf
    D
    convert starch into glucose so that it can be tested easily

  • In the experiment to show that light is necessary for photosynthesis, the pluked leaf is boiled in ethanol and then washed with water. After this, it is tested for the presence of a carbohydrate by a chemical which is:

    A
    salt solution
    B
    sugar solution
    C
    iodine solution
    D
    starch solution

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