AS & A Level Biology (9700) — May–June 2025, Paper 38
2 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Question 1 · 22 marks · Practical skills
You will carry out a serial dilution of the 1.0% copper sulfate solution, C, to reduce the concentration by half between each successive dilution. You need to prepare four…
Answer this question and get it marked →Question 2 · 18 marks · 9 Gas exchange and transport
M1 is a slide of a stained transverse section through a leaf. Draw a large plan diagram of the region of the leaf on M1 indicated by the shaded area in Fig. 2.1 (the…
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