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Q.

Which of the following plants is used to extract the blue dye ?

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a

Lupinus

b

Trifolium

c

Cassia

d

lndigofera

answer is B.

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Detailed Solution

Indigo (blue dye) is obtained from the leaves of Indigofera tinctoria and I. suffruticosa. The leaves contain a colourless chemical which on exposure to air turns bluish.

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