Examen

Exam respiration

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Grado
Lifescience

Institución
Lifescience

This is a one-hundred-and-thirty-mark exam that covers the topics of homeostasis and respiration. It has twelve questions allocated to it and the questions vary in style and ability. The exam is designed for high schools students studying life sciences. A full and comprehensive mark scheme is also ...

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Subido en 4 de septiembre de 2023
Número de páginas 39
Escrito en 2023/2024
Tipo Examen
Contiene Preguntas y respuestas

homeostasis and respiration

Institución
Lifescience
Grado
Lifescience

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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 .......................................................................................................................................... ....
.........................................................................................................................................

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