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explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct.
(e) If Assertion and reason both are incorrect.

Assertion (A): Ventricles have thicker muscular walls than the auricles.
Reason (R): Ventricles pump out blood with greater pressure than the auricles.

Q6. (a) What are the three major components of the circulatory system?
(b) Write three functions of the circulatory system?

Q7. Differentiate between the following -
(a) Pulmonary artery and Pulmonary vein
(b) RBCs and WBCs
(c) Arteries and Veins

Q8. (a) While learning to ride a bicycle, Rakesh lost his balance and fell. He got a
cut on his knees and it started bleeding. However, the bleeding stopped
after some time.

(i) Why did the bleeding stop?

(ii) Which type of blood cells are responsible for it?
(b) Which chambers of the heart contain oxygenated blood and deoxygenated
blood respectively?

Q9. (a) What is the location of heart inside our body and name the part of the body
which protects the heart?
(b) Name the four chambers of heart.
(c) What is the role of valves in the heart?
(d) What will happen if the chambers are not separated by septum?

Q10 (a) What is ‘X’ and write its two functions inside the body.
(b) How does ‘Y’ differ from ‘Z’ on the
basis of its -
(i) walls
(ii) Type of blood
(iii) Movement of blood