X is a wild animal which eats only the flesh of other animals whereas Y is a domestic animal which feeds mainly on green grass.

1. What are animals like X known as?
2. What are animals Y known as?
3. Which animal, X or Y, has a longer small intestine? Why?
4. Name one animal which is like X.
5. Name one animal which is like Y.

How do carbohydrates, proteins and fats get digested in human beings?

Draw the diagram of alimentary canal of man and label the following parts.Mouth, Oesophagus, Stomach, Intestine.

Explain the process of breathing in man.

Write the difference between nutrition in plants and animals.

How does food prepared by leaves is utilized by roots? Explain.

When a person eats sugary food, then organisms A present in his mouth act on sugar to produce a substance B. The substance B first dissolves the calcium salts from the top part C of the tooth and then from its middle part D forming holes E. These holes ultimately reach the part F in the lower part of tooth which contains nerves and blood vessels. The substance B irritates the nerve endings inside the tooth causing toothache.

1. What are (i) organisms A, and (ii) substance B?
2. What are (i) part C, and (ii) part D, of tooth known as?
3. By what name are the holes E in the tooth known?
4. Name the part F of the tooth.
5. What will happen if organisms A reach part F of the tooth known?

Name the conducting structures present in plants.

What are the various components of blood? State their functions.

The human body has an organ A which acts as a double pump. The oxygenated blood coming from the lungs through a blood vessel B enters the upper left chamber C of the double pump. When chamber C contracts, then blood goes into lower left chamber D. The contraction of chamber D forces the blood to go into a blood vessel E which supplies oxygenated blood to all the organs of the body (except the lungs). The deoxygenated blood coming out of the body organs is taken by a blood vessel F to the right upper chamber G of pumping organ. Contraction of chamber G forces the deoxygenated blood into right lower chamber H. And finally the contraction of chamber H sends the deoxygenated blood into lungs through a blood vessel I.

1. What is organ A?
2. Name the blood vessel (i) B (ii) E (iii) F, and (iv) I.
3. What are chambers (i) C, and (ii) D?
4. What are chambers (i) G and (ii) H?