Explain the various functions of blood.

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.''

Name the conducting structures present in plants.

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

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

Draw a schematic representation of transport and exchange of oxygen and carbon dioxide during transportation of blood in human beings and label on it, Lung capillaries, Pulmonary artery to lungs Aorta to body, Pulmonary veins from lungs.

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?

Explain the three pathways of breakdown in living organisms.

Give the steps involved in photosynthesis.