During the respiration of an organism A, 1 molecule of glucose produces 2 ATP molecules whereas in the respiration of another organism B, 1 molecule of glucose produces 38 ATP molecules.

1. Which organism is undergoing aerobic respiration?
2. Which organism is undergoing anaerobic respiration?
3. Which type of organism, A or B, can convert glucose into alcohol?
4. Name one organism which behaves like A.
5. Name two organisms which behave like B.

Excretion is different in multi-cellular organisms as compared to unicellular organisms. How?

Explain the three pathways of breakdown in living organisms.

Name the conducting structures present in plants.

Draw a labelled diagram of the human respiratory system.

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 process of nutrition in Draw labelled diagrams to show the various steps in the nutrition in Amoeba.

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

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

Some sugar solution is taken in a test-tube and a little of substance X in powder form is added to it. The mouth of test - tube is closed with a cork and allowed to stand for sometime. On opening the cork, a characteristic smell of substance Y is obtained and a gas Z is also observed to be formed. The gas Z extinguishes a burning matchstick.

1. What could be X, Y and Z?
2. What is the process of converting sugar into substance Y by the action of X known as?
3. What type of respiration is exhibited by X in the above process?