CIE iGCSE Co-Ordinated Science B9.4 Blood Exam Style Questions Paper 2
▶️ Answer/Explanation
The vena cava carries deoxygenated blood from the body to the right atrium, as correctly shown in row D. Row A is incorrect because the aorta carries blood from the left ventricle (not right). Row B is incorrect because the pulmonary artery carries deoxygenated blood from the right ventricle to the lungs. Row C is incorrect because the pulmonary vein carries oxygenated blood (not deoxygenated) from the lungs to the left atrium.
✅ Answer: (D)
✅ Answer: (D)
▶️ Answer/Explanation
Red blood cells contain haemoglobin, a protein that binds reversibly with oxygen in the lungs and releases it in tissues. The presence of a nucleus is not a feature of mature red blood cells, and a small surface area to volume ratio would reduce efficiency. Their biconcave disc shape, not spherical, increases surface area.
✅ Answer: (A)
✅ Answer: (A)
Question
Which component of blood is matched to its function?
▶️Answer/Explanation
Ans: D
Question
Which component is needed for blood to clot?
A hormones
B platelets
C red blood cells
D white blood cells
▶️Answer/Explanation
Answer: B
Explanation: Platelets are essential for blood clotting (haemostasis). They form a plug at the injury site and release chemicals that initiate the clotting cascade.