Choose the correct option.
Statement 1: When iodine solution is added to leaves, a change in colour to blue-black indicates the presence of starch.

Statement 2: Chlorophyll is removed by boiling the leaf in alcohol in a waterbath.

Only statement 1 is correct.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Only statement 2 is correct.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Both the statements are correct.

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Both the statements are incorrect.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C Both the statements are correct.
$∙$ Starch content in leaves can be tested by using dilute iodine solution. When iodine solution is added to leaves, a change of colour to blue-black indicates presence of starch.
$∙$ Boiling leaf in alcohol degrades chlorophyll pigment. Boiling alcohol dissolves chlorophyll and removes the green colour from the leaf, it becomes colourless. So, it is easy to see change in colour.

Suggest Corrections

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. 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. 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. Statement 1: When iodine solution is added to the leaves, a change in colour to blue indicates the presence of starch.

Statement 2: Chlorophyll is removed by boiling the leaf in water or alcohol.

Q. State whether 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.

Join BYJU'S Learning Program

Choose the correct option. Statement 1: When iodine solution is added to leaves, a change in colour to blue-black indicates the presence of starch. Statement 2: Chlorophyll is removed by boiling the leaf in alcohol in a waterbath.

Choose the correct option.
Statement 1: When iodine solution is added to leaves, a change in colour to blue-black indicates the presence of starch.

Statement 2: Chlorophyll is removed by boiling the leaf in alcohol in a waterbath.