IGCSE Science - Combined (0653) — October–November 2023, Paper 63
4 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →A student investigates the effect of light on a plant with variegated leaves (green parts with chlorophyll, white parts without). The plant is de-starched in the dark, a strip of…
Answer this question and get it marked →Urease is an enzyme that breaks down urea in solution to form aqueous ammonia. Urea in solution is almost neutral; the aqueous ammonia formed increases the pH of the solution.…
Answer this question and get it marked →A student investigates a white solid, H. The student dissolves some solid H in distilled water, adds universal indicator, and compares the colour with a pH colour chart; the…
Answer this question and get it marked →A student investigates the magnification of a thin converging lens using the apparatus in Fig. 4.1 (light source, object at object distance u, lens, image at image distance v,…
Answer this question and get it marked →