Every chemical reaction in the body takes place in the presence of:

Which vitamin is involved in allowing the eye to see in dim light?

The tube that connects the mouth to the stomach:

Anemia is caused due to the deficiency of:

Chemicals that take part in the reactions of digesting food and in speeding up reactions inside cells are called:

Cellulose in food is known as :

Which element acts as a heat insulator and helps to keep the mammals warm in cool conditions?

Proteins are made from:

Which organ plays a major part in the physical breakdown of food?

Which of the following is made up of carbon, hydrogen and oxygen?