What is the place of origin of the potato?

Brown leaf spot disease of rice is caused by

Identify the pair of alkaloids that is completely unrelated to $Rauwolfia$:
$(A)$ Reserpine
$(B)$ Ephedrine
$(C)$ Ajmaline
$(D)$ Colchicine

Arhar belongs to which genus?

Quinine is obtained from the bark of:

Among the following vegetarian food items,which one is considered to be the richest in proteins?