IGCSE Biology (0610) — May–June 2025, Paper 21
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Which characteristic of living things requires carbon dioxide to diffuse into a leaf? A excretion B movement C nutrition D respiration
Answer this question and get it marked →Which set of features is characteristic only of birds? A hair and wings B hard-shelled eggs and feathers C scales and soft-shelled eggs D wings and soft-shelled eggs
Answer this question and get it marked →Which structures are found in both plant and animal cells? A cell walls and cell membranes B nuclei and cell walls C cytoplasm and chloroplasts D cell membranes and nuclei
Answer this question and get it marked →A student made the following statements about the movement of ions by active transport. 1 It is the net movement of particles from a low concentration to a high concentration. 2…
Answer this question and get it marked →A DNA molecule contains pairs of bases. What is a correct combination of a pair of bases? A A and G B C and A C G and T D T and A
Answer this question and get it marked →What is the test for protein? The table gives, for each row, the name of the test, whether heat is required, and the colour change. name of the test heat colour change --- --- ---…
Answer this question and get it marked →The graph shows how enzyme activity is affected by temperature. The curve of enzyme activity (y-axis) against temperature in degrees C (x-axis, marked 0 to 60) rises from a low…
Answer this question and get it marked →Which descriptions of adaptations for photosynthesis are correct for spongy mesophyll tissue? The table shows, for each row, whether the tissue has air spaces for efficient gas…
Answer this question and get it marked →The table shows the recommended daily allowance (RDA) of some nutrients for young children. The table also shows the masses of these nutrients eaten by a child in one day. mass of…
Answer this question and get it marked →Which term is used for the uptake and use of nutrients by cells? A absorption B assimilation C egestion D ingestion
Answer this question and get it marked →What is the function of trypsin in digestion? A It catalyses the breakdown of maltose in the mouth. B It catalyses the breakdown of maltose in the small intestine. C It catalyses…
Answer this question and get it marked →The diagram shows the structure of a villus. Four parts are labelled A, B, C and D. A points to the central vessel running up the middle of the villus (the lacteal); B and C point…
Answer this question and get it marked →Which graph shows the effect of humidity in the air on the rate of transpiration in a plant? Four graphs of rate of transpiration (y-axis) against percentage humidity (x-axis, 0…
Answer this question and get it marked →In some countries, spring is the time of year when daffodil plants have green leaves and produce flowers. Which parts of the daffodil plants act as sources and sinks in spring?…
Answer this question and get it marked →In a fish, what is the sequence of structures that blood passes through after it leaves the heart? A gills - muscles - heart B gills - heart - muscles - heart C muscles - gills -…
Answer this question and get it marked →The diagram shows what happens in the body during active immunity. A flow chart reads: pathogens enter the body - W are detected - lymphocytes become active, which then branches…
Answer this question and get it marked →Cholera is a disease caused by a bacterium called Vibrio cholerae which produces a toxin in the infected person's gut. What is the effect of this toxin? A The toxin causes loss of…
Answer this question and get it marked →The graph shows how the volume of air in lungs changes when a person is breathing at rest. The trace is a regular wave of volume of air in lungs (y-axis) against time (x-axis);…
Answer this question and get it marked →The processes listed occur in living organisms. 1 cell division 2 diffusion 3 muscle contraction 4 osmosis Which processes require energy from respiration? A 1, 2, 3 and 4 B 1 and…
Answer this question and get it marked →What is a role of the glomerulus? A assembling amino acids into proteins B filtration of water, glucose, urea and ions from the blood C reabsorption of glucose, ions and water…
Answer this question and get it marked →The diagram shows a synapse between neurone 1 (above) and neurone 2 (below). Labels: P points to a vesicle inside the end of neurone 1; Q points to a transmitter substance…
Answer this question and get it marked →Which row shows the function of rod cells? The table shows, for each row, whether rod cells provide night vision and whether they provide colour vision. night vision colour vision…
Answer this question and get it marked →The diagram shows the positions of two endocrine glands in the human body; the enlarged view shows the two glands sitting on top of the kidneys (the adrenal glands). What is a…
Answer this question and get it marked →What is a response of the human body to overheating? A vasoconstriction of arterioles B vasoconstriction of veins C vasodilation of arterioles D vasodilation of veins
Answer this question and get it marked →What is an example of phototropism? A the growth of a root in the direction of gravity B the growth of a shoot towards light C the release of energy from glucose using light D the…
Answer this question and get it marked →Which statement describes the effect of antibiotics? A Antibiotics do not affect bacteria or viruses. B Antibiotics kill bacteria but do not affect viruses. C Antibiotics kill…
Answer this question and get it marked →The diagram shows one parent Hydra growing and releasing an offspring from the side of its body. Three stages from left to right show a small bud forming on the side of the parent…
Answer this question and get it marked →The diagram shows the changing concentrations of some hormones involved in the menstrual cycle. Hormone concentration (y-axis) is plotted against days 0 to 28 (x-axis). One curve…
Answer this question and get it marked →The diagram shows the chromosomes in the nucleus of a cell that divides by mitosis. The parent cell nucleus contains six chromosomes (three pairs of differing shapes/lengths).…
Answer this question and get it marked →A farmer bred together male cattle with white hair and female cattle with red hair. All the offspring produced had roan hair (a mixture of red and white). He then repeatedly bred…
Answer this question and get it marked →Phagocytes and neurones are two types of specialised cell. Which statements are correct? 1 Phagocytes and neurones express the same genes. 2 Both types of cell have the same…
Answer this question and get it marked →The table shows some features of leaves. Which leaf is adapted to survive in hot, dry habitats? number of stomata thickness of waxy cuticle surface area of leaf --- --- --- --- A…
Answer this question and get it marked →Which row correctly describes a type of selection? type of selection humans involved example --- --- --- --- A artificial no production of farmed animals that produce lots of milk…
Answer this question and get it marked →Which statement about a pyramid of energy for a food chain is correct? A It shows how energy is lost at each trophic level. B It shows the energy stored at each trophic level. C…
Answer this question and get it marked →The food web shows part of an ocean ecosystem. The producers are kelp, algae and diatom. Primary consumers feeding on producers: sea urchin (eats kelp), mussel and clam (eat…
Answer this question and get it marked →A student investigated the effect of high temperature on the production of nitrate ions in soil. Two samples of soil were taken. One sample was heated to 100 degrees C. All the…
Answer this question and get it marked →Which letter represents the lag phase in the population graph shown? The graph plots number of individuals in the population (y-axis) against time (x-axis) as a sigmoid (S-shaped)…
Answer this question and get it marked →Which term describes the number of different species living in an area? A biodiversity B conservation C ecosystem D population
Answer this question and get it marked →Which source of pollution can cause eutrophication? A carbon dioxide B methane C non-biodegradable plastic D sewage
Answer this question and get it marked →Some of the processes involved in the production of insulin by genetic modification are listed. 1 cutting of bacterial plasmid DNA with restriction enzymes 2 expression in…
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