DENDROLOGY

TREE PHYSIOLOGY

PHOTOSYNTHESIS

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

To test a leaf for starch the green pigment chlorophyll must be extracted. The leaf turns pale. What chemical removes the chlorophyll and de-colourises the leaf?

A	Iodine
B	Biuret Reagent
C	Benedict’s Reagent
D	Ethanol

Explanation:

Detailed explanation-1: -Hence, ethanol (an alcohol) is used to remove the pigment chlorophyll from a green leaf.

Detailed explanation-2: -Chlorophyll is water-insoluble, but can be easily dissolved in organic solvents such as ethanol, acetone, ether, and chloroform [5].

Detailed explanation-3: -Chlorophyll is the green pigment found in the leaves. It helps in the process of photosynthesis for preparing starch. For removing this pigment from the leaves, alcohol (ethanol) is used.

Detailed explanation-4: -The presence of starch in leaves can be tested by the Iodine test. When we remove chlorophyll from the leaf by boiling it in alcohol and then putting two drops of iodine solution, it is a colour change to blue indicates the presence of starch.

There is 1 question to complete.