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CAIE A-Level Biology AS 9.1.3 Gas Exchange Image Recognition Questions

Interpret gas-exchange images and identify structures and adaptations using evidence from each question and mark scheme.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • Interpret gas-exchange images and identify structures and adaptations.

CAIE A-Level Biology AS 9.1.3 Gas Exchange Image Recognition Questions question 1

[Maximum number: 3]

The trachea of the gas exchange system branches into two airways, each of which enters a lung.

Fig. 1.1 is a photomicrograph of a section through part of the trachea.

Fig. 1.1

Fig. 1.1

Identify structure X in Fig. 1.1 and outline the features that helped your identification. structure X=

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