question_answer 24)

  Which of the following plants is used to extract the blue dye? (a) Trifolium       (b) Indigofera    (c) Lupin                               (d) Cassia

Answer:

                  (b)Indigoferatintoria and Tsuffruticoga are the two plants belonging to the family-Fabaceae that produce blue indigo dye. The other options are incorrect as Trifolium is used as fodder. Lupin is an ornamental plant. Cassia is a shrub usually grown on the road side as an ornamental plant.