Formative Practice 10.2 (Form 4 Biology Textbook Exercise and Answer)


Question 1:
What is the function of the bicuspid valve?

Answer:
The bicuspid valve prevents the backflow of blood to the left atrium when the left ventricle contracts.


Question 2:
Explain why some individuals feel nauseous and faint immediately after donating blood?
Why do some blood donors need to take iron pills?

Answer:
After donating blood, the reduction of blood especially in the brain may cause nausea and faint spells.


Question 3:
State two differences between the structures of erythrocyte and leucocyte.

Answer:
Erythrocyte is biconcave-disc shaped and does not have a nucleus, whereas leucocyte has no definite shape and possesses a nucleus.


Question 4:
Explain why the left ventricle has a thicker muscular wall than the right ventricle.

Answer:
The left ventricle needs to pump blood to the whole body through the aorta. The thick muscular wall produces a stronger contraction force.

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