Which of the following plants is used to extract the blue dye?
a. Trifolium
b. Indigofera
c. Lupin
d. Cassia
NCERT Class XI
Biology - Exemplar Problems
Chapter 5. Morphology of Flowering Plants
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The answer is: (b) Indigofera.
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Indigofera is used to extract the blue dye.
Answer: Option b
Explanation:
The name of the plant is Indigofera tinctoria , which is under the family fabaceae. This plant is used to produce blue denim jeans. On average a single pair of blue denim jeans need 3-12 gram of indigo.
This plant is required to do dye wool and silk products. This plant is normally found in tropical area. Indigo is very safe for the human skin and it is also chemical free.
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