The alkaloid cocaine is obtained from

$A$ cultivated plant whose seed epidermis produces abundant cellulosic hairs used in the textile industry and the manufacture of fine-quality paper is:

Roots of which plant are used for treating blood pressure?

Which vegetable was absent in India before the arrival of European explorers?

The 'truth drug' scopolamine, which was used extensively in World War $II$, is obtained from:

Which plant is used to make pain-relieving drugs?