Page 108 - Science Class 07

5. Which of the following organisms does not have an open circulatory system?
(a) Earthworm (b) Ant

(c) Cockroach (d) Grasshopper
B. Fill in the blanks.
1. In plants, _____________ is the circulatory fluid whereas in human beings _____________
is the circulatory fluid.
2. Red blood cells consist of _____________ which transports oxygen.

3. _____________ are se ed deep in the skin and cannot be seen easily.
4. Blood from the liver is carried by the _____________ that joins the interior venacava.
5. In unicellular organims like amoeba, _____________ across the cell membrane is sufficient
to transport oxygen and carbon dioxide.
C. Match the following columns.
Column I Column II

1. RBC a. Bone marrow
2. WBC b. Diffusion
3. Heart c. Pericardium

4. Anaemia d. Supply of oxygen
5. Systemic e. Haemoglobin
6. Amoeba f. Loss of blood
D. Write True or False.

1. Plasma acts in blood clo ng and in defense of the body against diseases.
2. Oxygen combines with haemoglobin and forms oxyhaemoglobin.
3. The weight of the heart of a man is heavier than that of the heart of a woman.

4. The pulmonary artery carries oxyganated blood to the lungs.
5. Blood transfusion can be taken place between two people of the same blood group.
E. Very short answer ques ons.
1. What does blood consist of?

2. What is the func on of WBC?
3. Why blood platelets are important?
4. Write different parts of the heart.

5. What do you mean by pulse?
6. What is the func on of capillaries?
7. Who did discover that blood circulates in body through blood vessels?
8. What is haemolymph?

F. Short answer ques ons.
1. Differen ate between RBC and WBC.
2. Define structure and func on of heart.
3. Why do doctors check pulse rate?

108 Science-7