IGCSE Biology (0610) — October–November 2023, 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 are characteristics of all living organisms? A breathing, growth and movement B egestion, nutrition and reproduction C digestion, excretion and respiration D reproduction,…
Answer this question and get it marked →Using the binomial system, the name of a lion is Panthera leo. Which statement is correct? A The lion belongs to the kingdom Panthera. B The lion belongs to the genus Panthera. C…
Answer this question and get it marked →The diagram shows an organism called Chlamydomonas, with ribosomes, a mitochondrion, a nucleus and a chloroplast labelled. Which processes can Chlamydomonas carry out? A…
Answer this question and get it marked →The diagram shows the structure of a palisade cell from a leaf, with four structures labelled A, B, C and D. Which structure contains chlorophyll? A B C D
Answer this question and get it marked →A diagram of a white blood cell has a diameter of 76 mm. The magnification of the diagram is ×8000. What is the actual diameter of the white blood cell? A 0.095 µm B 0.95 µm C 9.5…
Answer this question and get it marked →Which diagram shows the appearance of a plant cell after it is placed in pure water? Each option A–D shows a plant cell in a different state. The correct one shows a turgid cell…
Answer this question and get it marked →Which process requires active transport? A oxygen movement from the alveoli to the blood B ion uptake by root hair cells from the soil C water movement through a plant by…
Answer this question and get it marked →Which row shows the chemical elements contained in fats? Columns: carbon; hydrogen; nitrogen; oxygen (key: ✓ = present, blank = absent). Which row A–D is correct? A B C D
Answer this question and get it marked →Glycogen is a large molecule made from smaller molecules. Which smaller molecules is glycogen made from? A amino acids B fatty acids C glucose D glycerol
Answer this question and get it marked →The graph shows the effect of temperature on the rate of a reaction catalysed by an enzyme, with section X on the part of the curve just after the peak (where the rate falls).…
Answer this question and get it marked →During growth, potato plants produce flowers and underground storage organs called tubers. During this time, which parts of the plant act as sources and sinks for translocation?…
Answer this question and get it marked →The diagram shows an experiment investigating the effect of light intensity on an aquatic plant. Test-tube P has a light source 20 cm away and test-tube Q has a light source 10 cm…
Answer this question and get it marked →Which human teeth are used for biting and cutting food? A canines and molars B incisors and canines C molars and premolars D premolars and incisors
Answer this question and get it marked →The diagram shows part of the human digestive system with four organs labelled A, B, C and D. Which organ produces hydrochloric acid? A B C D
Answer this question and get it marked →The diagram shows the structure of a villus, with the artery, capillary, lacteal and vein labelled A, B, C and D, and the direction of blood flow indicated. Which letter shows…
Answer this question and get it marked →By which process is water vapour lost from a leaf? A active transport B diffusion C osmosis D photosynthesis
Answer this question and get it marked →The pathway taken by water through a plant is shown: root hair cells → root cortex cells → Z → mesophyll cells. Which part of the pathway is Z? A palisade cells B phloem C stomata…
Answer this question and get it marked →The graph shows the thickness of the muscular wall in each of the four chambers of the mammalian heart (A, B, C, D). Which chamber is the right ventricle? A B C D
Answer this question and get it marked →Which row shows correct features of the circulatory system of a fish? Columns: number of atria; number of ventricles; number of times blood flows through the heart during one…
Answer this question and get it marked →Cholera infection can cause the following events. 1 Cells lining the small intestine secrete chloride ions. 2 Cholera bacteria produce a toxin. 3 Chloride ions move into the small…
Answer this question and get it marked →Which row shows the composition of expired air from a healthy person? Columns: carbon dioxide %; oxygen %; water vapour. A 0.04; 21; saturated B 0.04; 16; variable C 4; 21;…
Answer this question and get it marked →The table shows the relative concentrations of urea in the blood entering and leaving the kidneys and liver. Which row is correct? Columns: highest concentration of urea in the…
Answer this question and get it marked →Which statement about anaerobic respiration is correct? A Anaerobic respiration requires oxygen and releases less energy per glucose molecule than aerobic respiration. B Anaerobic…
Answer this question and get it marked →During exercise an oxygen debt may occur in muscles. What is the cause of this oxygen debt? A Aerobic respiration causes a decrease in lactic acid. B Aerobic respiration causes an…
Answer this question and get it marked →The diagram shows parts of the body involved in excretion in humans, labelled W, X, Y and Z. What are the labelled parts? Columns: W; X; Y; Z. A bladder; ureter; kidney; urethra B…
Answer this question and get it marked →The diagram shows a reflex action when a person touches a hot object and pulls their hand away: hot object touched → skin on hand (E) → neurone F → relay neurone → neurone G →…
Answer this question and get it marked →A light source is placed on one side of a growing plant. What is the correct explanation of the role of auxin in shoot growth? A Auxin is equally distributed in response to light…
Answer this question and get it marked →Which statement about antibiotics is correct? A Antibiotics are drugs. B Antibiotics are produced by white blood cells. C Antibiotics can become resistant to bacteria. D…
Answer this question and get it marked →The graph shows the number of cases of disease caused by MRSA bacteria in hospitals in one city between 1998 and 2010 (number of cases against year). What was the percentage…
Answer this question and get it marked →Some descriptions of reproduction are listed. 1 formation of a zygote with a diploid nucleus 2 formation of a zygote with a haploid nucleus 3 fusion of diploid nuclei of two…
Answer this question and get it marked →Which statement about pollination in plants is correct? A Cross-pollination is the transfer of pollen from the anther of a flower to the style of the same flower. B…
Answer this question and get it marked →The graph shows the changes in the concentration of a hormone that is involved in controlling the menstrual cycle (hormone concentration against time / days, 0–28), peaking around…
Answer this question and get it marked →Pea plants produce either yellow or green seeds. Yellow (Y) is dominant to green (y). What are the most likely phenotypes of the offspring of a cross between YY and Yy plants? A…
Answer this question and get it marked →The diagram shows the chromosomes of a cell after they have replicated and just before the cell divides by mitosis. Which pair of cells will be produced at the end of mitosis?…
Answer this question and get it marked →The table shows the number of stomata per mm² on the upper and lower epidermis of four different plants. Which plant is most likely to be a hydrophytic plant? Columns: upper…
Answer this question and get it marked →In which process in the nitrogen cycle do microorganisms take nitrogen from the air and convert it into nitrogen compounds? A decomposition B denitrification C nitrification D…
Answer this question and get it marked →An increased concentration of nitrates in water may result in the death of fish because of eutrophication. Some stages of eutrophication are given. 1 increased aerobic respiration…
Answer this question and get it marked →Which word describes the number of different species in an area? A biodiversity B community C ecosystem D population
Answer this question and get it marked →Which statement is an advantage of genetically modifying crops? A Less pesticide is used if the genetically modified crop is resistant to pests. B More herbicide is used if the…
Answer this question and get it marked →Which statements are correct descriptions of parts of the process of protein synthesis? 1 Amino acids are made by the ribosomes. 2 mRNA is copied. 3 The gene coding for the…
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