FORM 3 CHAPTER 1

PesonA Tuition CentreScience Form 3: Monthly Evaluation

1. Diagram 1 shows part of the human respiratory system.

(a) Label P, Q and R on Diagram 1 with the following words.

Lung Diaphragm Trachea

[3 marks]

(b) The sequence shows the flow of inhaled air in the respiratory system.

Trachea ( Z ( bronchiole ( alveolus

Label Z on Diagram 1.

[1 mark]

(c) The movement of S causes the thoracic cavity to expand during inhalation. How does S move during inhalation?

[1 mark]

2. Diagram 2 shows the gaseous exchange in an alveolus.

(a) Identify the gases labelled P and Q.

Gas P: .. Gas Q: ..[2 marks]

(b) Name the process involved in the gaseous exchange in the alveolus.

. [1 mark]

(c) What causes gas P to diffuse into the bloodstream?

. .

[1 mark]

(d) What happens to gas P as it enters the blood capillary?

.[1 mark]

(e) State one difference between blood X and blood Y.

. .

[1 mark]5. Diagram 5 shows a process that takes place in the human respiratory system.

(a) Name the process shown in Diagram 5.

[1 mark](b) Describe the movement of the following parts during this process.

(i) Ribs: .

(ii) Diaphragm: .

[2 marks](c) Explain briefly how air is forced into the lungs.

[2 marks](d) Complete the sequence to show the flow of air into the lungs during this process. [2 marks]S

P: .

Q: .

R: .

Diagram 1

S

EMBED MSPhotoEd.3

DIagram 2

Diagram 5

Nasal cavity

Bronchus

Alveolus

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