AS & A Level Biology (9700) — May–June 2025, Paper 31
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
A student is investigating the rate of diffusion of hydrochloric acid (HCl) into blue agar. Blue agar contains the indicator bromothymol blue. Blue agar turns yellow when it…
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A student is provided with a prepared slide of a transverse section (TS) of a leaf (labelled J1) and a diagram of a TS of a different leaf (Fig. 2.2). Observe the slide J1 and…
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