What this tests
Syllabus point 12.1 — Respiration, in Respiration. Difficulty easy (estimated from the question's demands, not a Cambridge rating).
Also set in
The same question, as Cambridge printed it in other papers.
Cambridge IGCSE Biology 0610 · 12.1 Respiration
June 2021 · Paper 12 · Question 23
One real Cambridge question from Respiration, with the official answer. Cambridge has printed this question 2 times.