CIE iGCSE Co-Ordinated Science B11. Gas exchange in humans Exam Style Questions Paper 3
Question
(a) Fig. 10.1 is a diagram of the gas exchange system in humans.
State the name of the parts labelled A and B in Fig. 10.1.
A ……………………………………………………………………………………………………………………………..
B ……………………………………………………………………………………………………………………………..
(b) Table 10.1 compares the composition of two gases in inspired air and expired air.
(i) Calculate the difference between the percentage of gas X in inspired air compared to expired air in Table 10.1.
……………………………………………….%
(ii) Describe the test for gas Y and state the positive result.
test
positive result ……………………………………………………………………………………………………..
(iii) State the name of the chemical reaction that occurs in cells that requires gas X.
(c) The rate of breathing increases during physical activity. State one other change to the pattern of breathing during physical activity.
(d) Pulse rate also increases during physical activity to supply more blood to the muscles. White blood cells are one of the major components of blood.
(i) State two other major components of blood.
1 ……………………………………………………………………………………………………………………….
2 ……………………………………………………………………………………………………………………….
(ii) State two functions of white blood cells.
1 ……………………………………………………………………………………………………………………….
▶Answer/Explanation
Ans:
10(a) A – trachea ;
B – diaphragm ;
10(b)(i) 5 (%) ;
10(b)(ii) limewater ;
cloudy ;
10(b)(iii) (aerobic) respiration ;
10(c) increased depth of breathing ;
10(d)(i) any two from:
red blood cells ;
platelets ;
plasma ;
10(d)(ii) phagocytosis ;
antibody production ;