Explain the term dialysis.

What substances are contained in pancreatic juice? What are their functions?

What is the difference between external and internal respiration.

1. List the three events that accur during the process of photosynthesis. Explain the role of stomata in this process.
2. Describe an experiment to show that ''sunlight is essential for photosynthesis.''

The organs A of a person have been damaged completely due to which too much of a poisonous waste material B has started accumulating in his blood, making it dirty. In order to save this person's life, the blood from an artery in the person's arm is made to flow into long tubes made of substance E which are kept in coiled form in a tank containing solution F. This solution contains three materials G, H and I in similar proportions to those in normal blood. As the person's blood passes through long tubes of substance E, most of the wastes present in it go into solution. The clean blood is then put back into a vein in the arm of the person for circulation.

1. What are organs A?
2. Name the waste substance B.
3. What are (i) E and (ii) F? Name G, H and I.
4. What is the process described above known as?

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.

Write the events that occur during the process of breathing in humans.

Draw a diagram of the human heart and label its parts.

Suggest a suitable reason for the heart having four separate chambers.

1. Draw the structure of a nephron and label the following on it: Glomerulus, Bowman’s capsule, Renal artery, Collecting duct.
2. What happens to glucose that enters the nephron along with filtrate?