Colchicine is used as a drug to cure

From which region were potatoes and tomatoes introduced to India?

Rice grain contains about

Reserpine, an alkaloid or drug extracted from the roots of which of the following plants, cures mental disorders and reduces or checks blood pressure?

Castor oil is obtained from which of the following plants?

$Vitis$ is a tendril climber,a species which is extensively used for: