CIE iGCSE Co-Ordinated Science B9.4 Blood Exam Style Questions Paper 1
▶️ Answer/Explanation
White blood cells do not transport oxygen (that is the job of red blood cells). They are responsible for phagocytosis (engulfing pathogens) and antibody production. Therefore, the correct row must have × for oxygen transport and ✓ for both phagocytosis and antibody production, which is row C.
✅ Answer: (C)
✅ Answer: (C)
▶️ Answer/Explanation
Red blood cells appear as small, round, biconcave discs without a nucleus in a blood smear.
They are distinguished from the larger, nucleus-containing white blood cells also visible in the field of view.
Counting only the red, disc-shaped cells in the diagram gives the total number present.
✅ Answer: (D)
They are distinguished from the larger, nucleus-containing white blood cells also visible in the field of view.
Counting only the red, disc-shaped cells in the diagram gives the total number present.
✅ Answer: (D)
Question
What is transported by red blood cells?
(A) glucose
(B) insulin
(C) oxygen
(D) urea
▶️Answer/Explanation
Ans: C
Question
Sea water is a mixture that contains sodium chloride dissolved in water.
Which row describes sea water?
▶️Answer/Explanation
Ans: C
Question
Dilute hydrochloric acid reacts with solid calcium carbonate.
Which change decreases the rate of the reaction?
(A) decreasing the concentration of the hydrochloric acid
(B) decreasing the size of the calcium carbonate pieces
(C) increasing the surface area of the calcium carbonate
(D) increasing the temperature of the acid
▶️Answer/Explanation
Ans: A