The largest groundnut producing country in the world is

What is the use of Guayule $(Parthenium argentatum)$?

Possibilities of the presence of coal in a particular area can be guessed by the study of

Who first studied the wheat rust problem in India?

Select the correct match.
$(a)$ Cinchona officinalis $(i)$ Rhizome
$(b)$ Rauwolfia serpentina $(ii)$ Bark
$(c)$ Curcuma longa $(iii)$ Root

Saccharum officinarum yields