IGCSE Biology (0610) — October–November 2023, Paper 21
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Some processes carried out by living organisms are listed. 1 egestion 2 excretion 3 reproduction 4 respiration Which processes are carried out by all living organisms? A 1, 2, 3…
Answer this question and get it marked →The scientific name for humans is Homo sapiens. What does Homo refer to? A mammal B genus C kingdom D species
Answer this question and get it marked →Some structures found in cells are listed. 1 cell membrane 2 cell wall 3 mitochondria 4 nucleus Which structures are found in prokaryotic cells? A 1 and 2 B 1 and 4 C 2 and 3 D 3…
Answer this question and get it marked →In a mesophyll cell, where are chloroplasts found? A between the cell wall and the cell membrane B in the cytoplasm C in the nucleus D in the vacuole
Answer this question and get it marked →The diagram shows a flatworm. The flatworm has been magnified by 100. The image measures 50 mm. What is the actual size of the flatworm? A 0.5 mm B 5 mm C 50 mm D 500 mm
Answer this question and get it marked →The diagrams show how a cell appears under the microscope at the start of an experiment and after it has been placed in a dilute solution of salts for 5 minutes (the cell becomes…
Answer this question and get it marked →The concentration of nitrate ions is higher inside a root hair cell than in the soil. What would be required for the absorption of nitrate ions into the root hair cell? 1…
Answer this question and get it marked →What is the colour change shown by Benedict's solution when heated with a reducing sugar? A blue to purple B blue to red C brown to blue-black D red to yellow
Answer this question and get it marked →The diagram shows the digestive system with four parts labelled A, B, C and D. Which part absorbs the most water? A B C D
Answer this question and get it marked →Which statement is correct? A The active site of an enzyme has the same shape as the substrate. B The active site is not affected by changes in temperature. C The shape of the…
Answer this question and get it marked →The graph shows how the rate of photosynthesis of a plant changes with light intensity, at three different carbon dioxide concentrations (0.10%, 0.04%, 0.02%). In each case the…
Answer this question and get it marked →The diagram shows a test-tube at the start and at the end of an enzyme experiment (enzyme + substrate → enzyme + products, after 10 minutes at 35 °C). At the end of the…
Answer this question and get it marked →The diagram shows the teeth in the lower jaw of a human, with four teeth labelled A, B, C and D. Which tooth is a molar? A B C D
Answer this question and get it marked →What is meant by chemical digestion? A Large insoluble molecules are broken down into small soluble molecules. B Large soluble molecules are broken down into small insoluble…
Answer this question and get it marked →The diagram shows a villus in the small intestine, with a region labelled X (the lacteal in the centre). What is absorbed at X? A fatty acids B glucose C glycogen D starch
Answer this question and get it marked →What is a description of transpiration? A exchange of gases between the leaf and the atmosphere B loss of water vapour from the leaves of a plant C movement of water from the…
Answer this question and get it marked →Parts of a plant are listed. 1 mesophyll cells 2 root cortex cells 3 root hair cells 4 xylem vessels What is the pathway taken by water in the plant? A 1→4→2→3 B 1→2→3→4 C 3→1→4→2…
Answer this question and get it marked →The diagrams show the single circulation of a fish and the double circulation of a mammal. In the fish, blood passes through the gill capillaries (R, S, T mark points around the…
Answer this question and get it marked →What is the role of lymphocytes in the blood? A antibody production B blood clotting C phagocytosis D oxygen transport
Answer this question and get it marked →A patient was injected with antibodies after being bitten by a poisonous snake. The patient recovered and survived. What describes the effect of the injection in the patient's…
Answer this question and get it marked →Which table correctly shows the difference in composition of inspired air compared with expired air? Each option A–D is a table with rows oxygen and carbon dioxide and columns…
Answer this question and get it marked →Which row shows the correct combination of muscle contractions and the pressure in the thorax when breathing out? Columns: internal intercostal muscles; external intercostal…
Answer this question and get it marked →Three statements about anaerobic respiration are listed. 1 In humans, the product is lactic acid. 2 In yeast, the product is lactic acid. 3 It releases more energy per glucose…
Answer this question and get it marked →What is the balanced chemical equation for a type of respiration that occurs in yeast? A C₆H₁₂O₆ + O₂ → CO₂ + 6H₂O B 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ C C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂ D…
Answer this question and get it marked →The diagram shows the human excretory system with four structures labelled A, B, C and D. Which labelled structure is the urethra? A B C D
Answer this question and get it marked →The diagrams show three types of neurones, labelled L, M and N (not to scale). Which sequence shows the direction that impulses will travel during a reflex action? A L→M→N B M→L→N…
Answer this question and get it marked →Which statement about rods and cones in the eye is correct? A Both rods and cones detect different colours of light. B Only cones are present in the blind spot. C Rods are more…
Answer this question and get it marked →Which diseases can be successfully treated with antibiotics? Columns: diseases caused by bacteria; rickets; diseases caused by viruses (key: ✓ = can be treated, blank = cannot be…
Answer this question and get it marked →Which statement about human sexual reproduction is correct? A All gametes are haploid. B Fertilisation occurs when two diploid nuclei fuse. C The sperm is the male zygote. D…
Answer this question and get it marked →Where is oestrogen produced? A cervix B ovaries C oviducts D uterus
Answer this question and get it marked →Which row shows correct information about mitosis? Columns: cells produced by mitosis (compared genetically with parent); number of chromosomes in the daughter cells compared to…
Answer this question and get it marked →Polydactyly is a condition that can occur in cats, resulting in affected individuals having extra toes. The diagram shows the inheritance of the condition in a family of cats…
Answer this question and get it marked →The photomicrograph shows a cross-section through a marram grass leaf. Which feature is an adaptation of a xerophyte? A the presence of chloroplasts B the presence of fine hairs C…
Answer this question and get it marked →Some statements about mutations are given. 1 A random change in the amino acid sequence in DNA causes gene mutation. 2 A mutation is a genetic change. 3 Ionising radiation…
Answer this question and get it marked →The graph shows the growth of a population of rabbits in one area, with point X on the rising (exponential/log) phase and point Y on the plateau. Which statements are correct? 1…
Answer this question and get it marked →In guinea pigs, the allele for black fur is dominant and the allele for white fur is recessive. A test cross can be used to determine the genotype of a guinea pig with black fur.…
Answer this question and get it marked →The diagram shows part of the nitrogen cycle, with nitrogen gas in the atmosphere, animal and plant protein, ammonium ions and nitrates in the soil, linked by processes R, S and T…
Answer this question and get it marked →During eutrophication, what causes the death of fish? A increased growth of producers B increased photosynthesis by producers C decreased concentration of carbon dioxide in the…
Answer this question and get it marked →Which product is made using an enzyme rather than bacteria or fungi? A insulin B penicillin C lactose-free milk D mycoprotein
Answer this question and get it marked →Some ways in which humans make use of organisms are listed. 1 using yeast to produce ethanol 2 artificial selection of sheep with thick wool 3 using bacteria to produce human…
Answer this question and get it marked →← October–November 2023 Paper 22 · October–November 2023 Paper 13 →