IB Biology SL B3.1 Gas exchange questions

Exam-style multiple choice and written questions with full markschemes. Check multiple choice answers straight away, or type, photograph or draw a written answer and get it marked.

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Question 1

Multiple choiceEasy1 mark

During a spirometry investigation, a student takes a normal breath in and then inhales as much additional air as possible. Which lung volume is represented by the additional volume measured?

Show answer and explanation

Answer: B. Inspiratory reserve volume is the additional volume that can be inhaled after a normal inspiration.

A: confuses the additional inhalation with tidal volume, the volume moved during a normal breath.
C: reverses the direction; expiratory reserve volume is additional air exhaled after a normal expiration.
D: treats the additional volume as vital capacity, which is the volume moved between maximum inspiration and maximum expiration.
Remember: inspiratory reserve is measured beyond the end of a normal inspiration.

Question 2

Paper 2Easy2 marks

A student uses a spirometer to measure the volume of air exhaled during three normal breaths.

BreathVolume of air exhaled / dm³
10.46
20.50
30.54
(a)

Determine the mean tidal volume.

[1]
(b)

State one change in the diaphragm during inspiration.

[1]

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