IGCSE Biology (0610) — October–November 2024, Paper 23
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →What is a description of excretion? A a chemical reaction that releases energy B a permanent increase in size and dry mass C removal of waste products of metabolism D taking in…
Answer this question and get it marked →The scientific name for a domestic horse is Equus caballus. Which row shows the two parts of the name using the binomial system? (columns: Equus; caballus) A kingdom; species B…
Answer this question and get it marked →The diagram shows a type of plant cell with a nucleus, cytoplasm, cell wall and vacuole (no chloroplasts shown). Where does this type of cell come from? A root B cuticle C…
Answer this question and get it marked →What is the formula for calculating magnification? A actual size / image size B actual size x image size C image size / actual size D image size x actual size
Answer this question and get it marked →The diagram represents a substance moving across a cell membrane, using energy from respiration (against the concentration gradient). Which method of transport does the diagram…
Answer this question and get it marked →Which food-testing reagent shows a positive result when it turns from blue to purple? A Benedict's solution B biuret C ethanol D iodine solution
Answer this question and get it marked →What are the characteristics of an enzyme? (columns: the active site is the same shape as the substrate; it is used up during the reaction; it is made of protein) A no; no; yes B…
Answer this question and get it marked →An enzyme in potato cells causes oxygen to be produced from the breakdown of hydrogen peroxide. Cubes of potato tissue were placed in a hydrogen peroxide solution at different…
Answer this question and get it marked →Which molecules contain nitrogen? A amino acids B fats C glucose D starch
Answer this question and get it marked →The photomicrograph shows the lower surface of a leaf with a part labelled X (an opening between two guard cells). Which part of the leaf is labelled X? A guard cell B palisade…
Answer this question and get it marked →Which row shows the correct enzyme, its substrate and the site of enzyme action in the alimentary canal? (columns: enzyme; substrate; site of enzyme action) A amylase; starch;…
Answer this question and get it marked →A student set up the experiment shown (a potometer with a leafy shoot, reservoir of water, scale, capillary tube and air bubble) on a hot and dry day. The air bubble moved towards…
Answer this question and get it marked →Which statement describes the process of translocation? A the movement of sucrose and amino acids in the xylem from the source to the sink B the movement of sucrose and water in…
Answer this question and get it marked →The diagram shows the human heart with valves labelled W, X, Y and Z. What are the semilunar valves? A W and X B W and Z C X and Y D Y and Z
Answer this question and get it marked →Which component of the blood transports hormones? A plasma B platelets C red blood cells D white blood cells
Answer this question and get it marked →During the process of vaccination, what stimulates an immune response? A antibodies B antigens C lymphocytes D phagocytes
Answer this question and get it marked →Muscles are responsible for the ventilation of the lungs during breathing. Which row describes their action during the inspiration of air? (columns: diaphragm muscles; external…
Answer this question and get it marked →Which molecule is a product of anaerobic respiration in yeast? A C2H5OH B C6H12O6 C H2O D O2
Answer this question and get it marked →In a kidney nephron, which substances are filtered out of the blood in the glomerulus? A glucose, protein, ions and water B glucose, protein, urea and water C glucose, ions, urea…
Answer this question and get it marked →How many types of cone cells are there in the human eye? A 1 B 2 C 3 D 4
Answer this question and get it marked →The diagram shows a plant shoot growing towards the light, with points J, K, L and M labelled. Which row describes where auxin is produced, and which side of the shoot has the…
Answer this question and get it marked →Which statement about antibiotics is correct? A Antibiotics are produced by memory cells. B Antibiotics are used to treat rickets. C Antibiotics are used to treat viral…
Answer this question and get it marked →The diagram shows a strawberry plant with parts labelled A, B, C and D. Which labelled part of the plant can only be produced by asexual reproduction? A A B B C C D D
Answer this question and get it marked →Which part of a flower can contain a pollen tube? A anther B filament C stamen D style
Answer this question and get it marked →To avoid extinction of rare plant species, a botanical garden keeps a collection of seeds known as a seed bank. Which condition will prevent these seeds germinating while they are…
Answer this question and get it marked →The graph shows the changes to the thickness of the lining of the uterus during the menstrual cycle (thickness against day of the menstrual cycle, 0-28). Which hormone is…
Answer this question and get it marked →Which hormone concentrations are high during pregnancy? (columns: LH; oestrogen; progesterone) A no; no; yes B yes; no; no C no; yes; yes D yes; yes; no
Answer this question and get it marked →By which route would an HIV infection not be transmissible? A blood B saliva C sharing needles for injections D semen
Answer this question and get it marked →Which description of a human gamete is correct? A a diploid cell with 23 chromosomes B a diploid cell with 46 chromosomes C a haploid cell with 23 chromosomes D a haploid cell…
Answer this question and get it marked →Which statements about meiosis are correct? (columns: produces genetically identical cells; involved in the production of gametes) A yes; no B yes; yes C no; yes D no; no
Answer this question and get it marked →A female parent who is heterozygous for red-green colour blindness has a female child with a red-green colour-blind male parent. What is the chance of the female child being…
Answer this question and get it marked →A pure-breeding plant with smooth stems was crossed with a heterozygous plant with hairy stems. What will be the ratio of hairy to smooth stems in the resulting plants? A 1 hairy…
Answer this question and get it marked →Which row shows the adaptive features of a xerophyte? (columns: deep roots; leaves with small surface area; many stomata on leaves; thin leaf cuticle) A yes; yes; no; no B yes;…
Answer this question and get it marked →The diagram shows a marine food web: phytoplankton - zooplankton - cod and harbour seal; zooplankton - shrimp and mackerel; (cod is eaten by harbour seal). At which trophic levels…
Answer this question and get it marked →The diagram shows part of the carbon cycle with arrows labelled A, B, C and D between air, fossil fuels, plant and animal. Which labelled arrow would have the balanced chemical…
Answer this question and get it marked →Which statement explains why there is a lag phase in a population graph? A The build-up of waste products limits population growth. B The low population size limits the birth…
Answer this question and get it marked →The flow chart describes the process of eutrophication: step X - increased growth of producers - increased decomposition after death of producers - step Y - death of organisms in…
Answer this question and get it marked →How can fish stocks be conserved? A closed seasons B decreased mesh size C increased quotas D reduction in protected areas
Answer this question and get it marked →Penicillin is produced in a fermenter by growing the fungus Penicillium. The graph shows how the mass of living Penicillium fungus and the concentration of penicillin change over…
Answer this question and get it marked →Which enzymes are required to produce human proteins, using genetic modification? (columns: to cut the bacterial plasmid DNA; to form a recombinant plasmid; to isolate the DNA…
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