The alkaloid caffeine is present in

Pungency in chillies is due to the presence of

Which one of the following substances is used in the preservation of food stuff?

The Weedicide commonly used for paddy is :

Which one of the following is used in the manufacture of soaps?

In India, the use of carbofuran, methyl parathion, phorate and triazophos is viewed with apprehension. These chemical are used as :