Give a botanical name of green gram and write its  origin and area of cultivation and uses.

Write a note on origin and area of cultivation of cotton.

Write about the Henna with its origin and areas of cultivation and uses.

The following are the binomials of economically useful plants. Mention their respective families.
(a) Borassus flabellifer
(b) Mangifera indica
(c) Saccharum officinarum
(d) Curcuma longa
(e) Capsicum annum
(f) Tamarindus indica

Siddha medicine is an age old practice in our nation. According to this medicinal sysem, what is the major cause for all sort of illness in humans?