Plants absorb water from the soil. How does this water reach to the top of the tree? Explain in detail.

Explain the process of breathing in man.

Name the main organs of the human digestive system in the order they participate in the process of digestion. Describe how digestion of carbohydrates and proteins take place in our body.

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.

Describe the working of human blood circulatory system with the help of a suitable diagram which shows all the steps involved.

Platelets help in clotting of blood at injured side. Draw a flow diagram of this process.

1. Name the organs that form the excretory system in human beings.
2. Describe in brief how urine is produced in human body.

Where does anaerobic respiration occur in human body?

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?

1. Draw a diagram of human alimentary canal and label - gall bladder, pancreas, liver and small intestine on it.
2. Give two reasons to explain why absorption of digested food occurs mainly in the small intestine.