120 MINUTES
SCIENCE (BIOLOGY- HOMEOSTASIS AND RESPIRATION)
130 MARKS
GRADE
Instructions
The question paper consists of 12 questions.
Answer all the questions.
Number the answers correctly according to the numbering system used on this question
paper.
,Questions
Q1.
Aerobic respiration is the process that releases energy for use in the body.
(a) Give the word equation for the process of aerobic respiration.
(4)
.................................... + ...................................... → .....................................
+ .................................... + energy
(b) A spirometer is used to measure the volumes of air breathed in and the volumes of air
breathed out.
The spirometer trace shows the readings taken of a person at rest.
(i) Calculate the rate of breathing between points A and B shown on the trace.
(2)
rate = ........................................................... breaths per minute
(ii) Calculate the difference in the volume of air breathed in and the volume of air
breathed out between points B and C.
(3)
difference in volume = ........................................................... dm 3
,(c) Describe the differences that would be seen in the trace between points A and B if the
person had been exercising vigorously before the readings were taken.
(2)
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
(Total for question = 11 marks)
, Q2.
The diagram shows an alveolus and its blood supply.
(a) (i) What is the name of blood component X?
(1)
A plasma
B platelet
C red blood cell
D white blood cell
(ii) State three ways in which air in the alveolus differs from air in the atmosphere.
(3)
1 .......................................................................................................................................... ...
..........................................................................................................................................
2 .......................................................................................................................................... ...
..........................................................................................................................................
3 .......................................................................................................................................... ....
.........................................................................................................................................
(iii) Give three features of alveoli that allow efficient gas exchange.
(3)
1 .......................................................................................................................................... ...
..........................................................................................................................................
2 .......................................................................................................................................... ....
.........................................................................................................................................
3 .......................................................................................................................................... ....
.........................................................................................................................................
SCIENCE (BIOLOGY- HOMEOSTASIS AND RESPIRATION)
130 MARKS
GRADE
Instructions
The question paper consists of 12 questions.
Answer all the questions.
Number the answers correctly according to the numbering system used on this question
paper.
,Questions
Q1.
Aerobic respiration is the process that releases energy for use in the body.
(a) Give the word equation for the process of aerobic respiration.
(4)
.................................... + ...................................... → .....................................
+ .................................... + energy
(b) A spirometer is used to measure the volumes of air breathed in and the volumes of air
breathed out.
The spirometer trace shows the readings taken of a person at rest.
(i) Calculate the rate of breathing between points A and B shown on the trace.
(2)
rate = ........................................................... breaths per minute
(ii) Calculate the difference in the volume of air breathed in and the volume of air
breathed out between points B and C.
(3)
difference in volume = ........................................................... dm 3
,(c) Describe the differences that would be seen in the trace between points A and B if the
person had been exercising vigorously before the readings were taken.
(2)
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
(Total for question = 11 marks)
, Q2.
The diagram shows an alveolus and its blood supply.
(a) (i) What is the name of blood component X?
(1)
A plasma
B platelet
C red blood cell
D white blood cell
(ii) State three ways in which air in the alveolus differs from air in the atmosphere.
(3)
1 .......................................................................................................................................... ...
..........................................................................................................................................
2 .......................................................................................................................................... ...
..........................................................................................................................................
3 .......................................................................................................................................... ....
.........................................................................................................................................
(iii) Give three features of alveoli that allow efficient gas exchange.
(3)
1 .......................................................................................................................................... ...
..........................................................................................................................................
2 .......................................................................................................................................... ....
.........................................................................................................................................
3 .......................................................................................................................................... ....
.........................................................................................................................................
