The sugar-yielding part of $Beta\, vulgaris$ is:

Quinine used for the treatment of malarial fever is extracted from

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

The tobacco plant $Nicotiana \, tabacum$ belongs to the family:

Cardamom is the dried mature fruit of which plant?

What is the source of $Hevea$?