The fuel of most widely used cryogenic engines consists of :

Which one among the following is the world's largest exporter of agricultural products

Which one of the following is not required for the formation of photochemical smog?

What is/are the use/uses of maize?

1. It is used for the production of starch.
2. It is used in the manufacture of poultry feed.
3. It is used in producing bio-fuel.

Select the correct answer using the codes given below:

A person sleeping in Leh with his head in the open and legs in the shade of a tree is liable to get sunstroke and frostbite at the same time. The reason for this is :

Which one among the following is the poorest source of vitamin A?