What this tests
Syllabus point 12.3 — Anaerobic 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 · 12.3 Anaerobic respiration
November 2019 · Paper 21 · Question 21
One real Cambridge question from Respiration, with the official answer. Cambridge has printed this question 3 times.