Question

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Answer 1

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☑️Ans 1⤵️⤵️

The leaf was boiled in alcohol to remove the chlorophyll from the leaf.

☑️Ans. 2⤵️⤵️

We dip the leaf in the water before adding iodine solution to clean the leaf and kill bacteria so that the leaf will easily change it's color during the starch test.

Answer 2

b)

(i) The leaf is boiled in alcohol to remove the chlorophyll of the leaves . This is because if chlorophyll is not removed , then we cannot perform the starch test and identify our aim . Alcohol not only removes the chrolophyll part but also the green colour from the lead which helps us to easily distinguish the parts .

(ii) The leaf is dipped in iodine solution to examine the presence of starch in it . It also kills bacteria present in the leaves . This helps us to check that the experiment is carried neatly and accurately. If starch is present then the experiment will not show the accurate results.

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⚫ The test is conducted to check whether chlorophyll is necessary for photosynthesis or not .

⚫ We must destarch the leaves and variegated leaves must be taken for the best results.

⚫ Leaves should be free from any bacteria and the proper steps should be followed.

⚫ Coleus is a leaf that can be taken during the test .