IGCSE Biology (0970) — May–June 2024, Paper 21
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →A person touches a hot object and rapidly moves their hand away from the hot object. Which characteristic of living organisms is this an example of? A excretion B growth C…
Answer this question and get it marked →Which types of organisms are used in genetic modification because they have plasmids? A arachnids B bacteria C myriapods D ferns
Answer this question and get it marked →The list shows some of the structures contained in cells: • cytoplasm • cell membrane • cell wall • chloroplast How many of these structures are found in the cells of all living…
Answer this question and get it marked →A student draws a red blood cell. The diameter of the red blood cell they draw is 20 mm. The actual diameter of the red blood cell is 0.008 mm. What is the magnification of the…
Answer this question and get it marked →Samples of plant cells from the same species are immersed in three different liquids. The low concentration sucrose solution has a higher water potential than the plant cell…
Answer this question and get it marked →Which process requires energy from respiration? A active transport B diffusion C osmosis D transpiration
Answer this question and get it marked →The diagram shows the sticky end of the DNA of a plasmid that has been cut by a restriction enzyme. The unpaired bases are labelled C A G T G. What is the correct sequence of the…
Answer this question and get it marked →A test was performed on a food substance. A positive result was shown by a colour change to blue-black. What solution was used for the test? A biuret solution B DCPIP solution C…
Answer this question and get it marked →A student investigates the breakdown of fats in milk by lipase. Four test-tubes A–D are set up. The table shows the contents (key: ✓ = present, ✗ = absent): A: milk ✓, bile ✓,…
Answer this question and get it marked →The diagram shows an experiment to investigate the effect of increasing light intensity on the rate of photosynthesis in an aquatic plant (rate found by measuring bubble release).…
Answer this question and get it marked →The diagram shows a section through the leaf of a flowering plant with regions labelled 1, 2, 3 and 4. Where does photosynthesis take place? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4
Answer this question and get it marked →The diagram shows part of the alimentary canal and associated organs labelled A, B, C and D. Which labelled part stores bile? A B C D
Answer this question and get it marked →The list contains statements about villi. 1 Villi increase the efficiency of the absorption of nutrients. 2 Villi increase the efficiency of the alveoli during gas exchange. 3…
Answer this question and get it marked →The diagrams show carbohydrate molecules as they pass through the alimentary canal (before taking into the mouth, after some time in the mouth, after some time in the small…
Answer this question and get it marked →Which row shows correct information about three digestive enzymes in humans? Columns: lipase; maltase; trypsin. A acts in acidic conditions; acts in the stomach; secreted by the…
Answer this question and get it marked →Which substance found in a healthy diet helps to prevent constipation? A fat B fibre C minerals D vitamins
Answer this question and get it marked →When is the transpiration rate of a well-watered plant highest? A on a cool, dry, windy day B on a cool, wet, windy day C on a hot, dry, windy day D on a hot, wet, windy day
Answer this question and get it marked →Which statement is correct for a flowering plant during photosynthesis? A The flowers, fruits, leaves and roots are all sources of sucrose. B The fruits are a source of sucrose…
Answer this question and get it marked →What is an advantage of having a double circulatory system? A It uses less energy because blood flows through the heart only once in each circuit around the body. B Concentration…
Answer this question and get it marked →The diagram shows the external structure of the human heart with parts labelled A, B, C and D. Which part is blocked in coronary heart disease? A B C D
Answer this question and get it marked →One of the symptoms of the disease cholera is diarrhoea. This is due to water loss by osmosis caused by the cholera toxin. What is the effect of cholera toxins that results in…
Answer this question and get it marked →Which statement about immunity is correct? A A part of the antibody molecule has the same shape as the antigen it acts on. B Babies develop passive immunity from the antibodies…
Answer this question and get it marked →What are the functions of the diaphragm and the cilia in the human gas exchange system? Columns: diaphragm; cilia. A contracts to cause breathing in; carry mucus to the throat B…
Answer this question and get it marked →Vigorous exercise can cause an oxygen debt. Which process removes the oxygen debt? A aerobic respiration of lactic acid in the liver B a decrease in breathing rate C a decrease in…
Answer this question and get it marked →In healthy people, which substance is completely reabsorbed into the blood from the kidney nephrons? A glucose B salts C urea D water
Answer this question and get it marked →What would be the pupil size and lens shape of a person reading a mobile phone text message in a brightly lit room? Columns: pupil size; lens shape. A large; fat B large; thin C…
Answer this question and get it marked →What describes how the body maintains a constant internal temperature on a hot day? A Vasoconstriction increases blood flow to the skin surface capillaries. B Vasoconstriction…
Answer this question and get it marked →What would lead to a decrease in blood glucose concentration? A increased release of adrenaline B increased release of amylase C increased release of glucagon D increased release…
Answer this question and get it marked →Which statement about antibiotics is correct? A Antibiotics do not affect bacteria but kill viruses. B Antibiotics do not affect bacteria or viruses. C Antibiotics kill bacteria…
Answer this question and get it marked →The diagram shows the carpel of a flower just after pollination, with the part labelled X (a pollen tube growing down the style). What is the name of the part labelled X? A…
Answer this question and get it marked →The table shows the percentage of sperm with different abnormalities in samples from a person with normal fertility and two people (P and Q) with low fertility: no acrosome —…
Answer this question and get it marked →Which word is used to describe stem cells? A gametes B haploid C homozygous D unspecialised
Answer this question and get it marked →The graph shows the concentration of four hormones (A, B, C, D) during the menstrual cycle, with ovulation at day 14. Which line represents progesterone? A B C D
Answer this question and get it marked →The pedigree diagrams show the pattern of inheritance of a genetic disorder in four families (A–D). This genetic disorder is not sex-linked. Which pedigree diagram proves that the…
Answer this question and get it marked →What are correct statements about meiosis? Columns: produces genetically identical cells; involved in repair of damaged tissues. A yes; yes B yes; no C no; yes D no; no
Answer this question and get it marked →The photograph shows a species of fish called a leafy sea-dragon. Leafy sea-dragons live in areas of the sea where seaweed is present. Which statements explain how natural…
Answer this question and get it marked →What is the main source of energy input to biological systems? A glucose B oxygen C plants D the Sun
Answer this question and get it marked →Which organisms remove nitrate ions from soil? A denitrifying bacteria and nitrogen-fixing bacteria in root nodules B denitrifying bacteria and plants C nitrifying bacteria and…
Answer this question and get it marked →What are two reasons for organisms becoming endangered? 1 habitat destruction 2 monitoring 3 education 4 pollution 5 captive breeding programmes A 1 and 4 B 1 and 5 C 2 and 3 D 3…
Answer this question and get it marked →What is an example of the use of genetic modification in agriculture? A choosing cattle to breed so that alleles for high milk yield will be passed on to their offspring B…
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