IGCSE Biology (0610) — May–June 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 →What are characteristics of all organisms? A egestion and excretion B egestion and nutrition C excretion and nutrition D excretion and photosynthesis
Answer this question and get it marked →The scientific name for the golden eagle is Aquila chrysaetos. What is the genus of the golden eagle? A Aquila B chrysaetos C eagle D golden
Answer this question and get it marked →Which row shows structures that are present in both root hair cells and palisade mesophyll cells? Columns: cell wall, chloroplasts, cytoplasm, vacuole (key: ✓ = present, blank =…
Answer this question and get it marked →The photomicrograph shows a plant cell. The length of line XY is 90 mm. The actual length of the cell is 30 µm. What is the magnification of the photomicrograph? A ×300 B ×3000 C…
Answer this question and get it marked →The diagram shows an experiment demonstrating osmosis using a dialysis tubing bag containing sugar solution, connected to a glass tube and placed in water. After 30 minutes, the…
Answer this question and get it marked →The diagram shows the movement of glucose molecules across a cell membrane from a low concentration to a high concentration, using energy and a membrane molecule T. Which…
Answer this question and get it marked →The diagram shows part of a protein molecule with one repeating sub-unit labelled X. What does X represent? A amino acid B fatty acid C glycerol D sugar
Answer this question and get it marked →The structure of DNA involves two strands coiled together to form a double helix. Which pairing of bases between the two strands is correct? A A and G B A and T C C and A D C and T
Answer this question and get it marked →What is true of all enzymes? Columns: they are sugars; they are most effective at pH 7 (key: ✓ = yes, blank = no). Which row A–D is correct? A B C D
Answer this question and get it marked →Which statement about human enzymes is correct when they are at temperatures above 80 °C? A The enzyme molecules are denatured. B The shape of the active site is stable. C More…
Answer this question and get it marked →An experiment is set up to investigate gas exchange in aquatic plants. An aquatic plant is placed in hydrogencarbonate indicator solution in the light. The hydrogencarbonate…
Answer this question and get it marked →Certain factors are needed for photosynthesis. If a factor is in short supply, it limits the rate of photosynthesis. Which of these could be limiting factors? 1 carbon dioxide 2…
Answer this question and get it marked →The haemoglobin concentration in the blood of a person is 80 g / dm³. The accepted normal concentration is 120 g / dm³ or above. Which substance may be lacking in their diet? A…
Answer this question and get it marked →Which statement about physical digestion is correct? A It increases the surface area of food. B It involves enzymes. C It takes place in the mouth only. D It produces smaller…
Answer this question and get it marked →Which statement describes the effect of atmospheric humidity on the rate of transpiration? A In high humidity, the transpiration rate is high because there is slow diffusion of…
Answer this question and get it marked →Sucrose and amino acids move around a plant from sources to sinks. Which row shows the sources and sinks? Columns: root cortex cells; xylem vessels; palisade mesophyll cells. A…
Answer this question and get it marked →Which statements describe how the structures in the circulatory system function? 1 a muscular pump to push blood into vessels 2 valves to ensure one-way blood flow 3 veins to take…
Answer this question and get it marked →The diagram shows a section through the heart with four parts labelled A, B, C and D. Which part is the septum? A B C D
Answer this question and get it marked →The cholera bacterium toxin causes dehydration and loss of salts from the blood in humans. Which statement explains the reason for this? A Chloride ions are secreted into the…
Answer this question and get it marked →During inspiration, the processes listed take place. P volume of the thorax increases Q air rushes into the lungs R pressure in the thorax decreases S external intercostal muscles…
Answer this question and get it marked →In the chemical equation for anaerobic respiration in yeast, the numbers have been replaced by the letters W, X, Y and Z: C(W)H(X)O(W) → Y·C(Y)H(Z)OH + Y·CO(Y). Which number is Z?…
Answer this question and get it marked →A student measured their oxygen consumption before, during and after exercise. The results are shown in the graph (oxygen consumption / dm³ per minute against time / minutes, with…
Answer this question and get it marked →Which row shows where glucose will be found in the body of a healthy human after eating a meal? Columns: renal artery; renal vein; glomerulus; nephron; ureter (yes/no). A yes; no;…
Answer this question and get it marked →The events listed involve neurotransmitter molecules at a synapse. 1 They bind with receptor proteins. 2 They diffuse across the synaptic gap. 3 They enter the synaptic gap. 4…
Answer this question and get it marked →What occurs during accommodation to focus on distant objects? Columns: ciliary muscle; lens shape; suspensory ligaments. A contracts; fat; slack B relaxes; thin; tight C…
Answer this question and get it marked →What is a correct statement about auxin in shoots? A It is made only on the shaded side of the shoot. B It is more concentrated on the side of the shoot that receives the most…
Answer this question and get it marked →What is a correct statement about antibiotics? A Bacteria may become resistant to antibiotics as a result of artificial selection. B Bacteria may become resistant to antibiotics…
Answer this question and get it marked →Potatoes are stem tubers. A tuber can be placed in the ground to grow into another plant, which can grow many more tubers (asexual reproduction shown over 4 months). The diploid…
Answer this question and get it marked →Which row about asexual reproduction is correct? Columns: number of parents; offspring identical to parents; offspring identical to each other. A one; no; yes B one; yes; yes C…
Answer this question and get it marked →The statements describe how a protein is made. 1 mRNA passes through a ribosome. 2 mRNA molecules carry a copy of the gene to the cytoplasm. 3 The gene coding for the protein is…
Answer this question and get it marked →Which parents could produce offspring with blood group O? A heterozygous father with blood group A and heterozygous mother with blood group B B heterozygous father with blood…
Answer this question and get it marked →The diagram shows the inheritance of albinism in one family. Albinism is an inherited condition caused by a recessive allele. The pedigree shows generations with unaffected…
Answer this question and get it marked →Which term is a genetic change? A allele B genotype C mutation D phenotype
Answer this question and get it marked →Which adaptation may be present in a xerophyte? A leaves with small surface area and large numbers of stomata B little or no xylem tissue and leaves with large surface area C…
Answer this question and get it marked →The diagram shows energy flow from the Sun, through a food chain (plant → animal → animal) and into the environment, with arrow 1 from the Sun to the plant and arrow 2 along the…
Answer this question and get it marked →A few yeast cells were placed in a container of nutrient solution. The graph shows how their population size changed over time, with four numbered phases (1 lag, 2 exponential, 3…
Answer this question and get it marked →The number of Atlantic bluefin tuna fish found in the Atlantic Ocean has significantly decreased in the last 50 years. Which method would make the biggest improvement in the…
Answer this question and get it marked →The bloodworm is an organism that is found in heavily polluted water. The diagram shows where raw sewage flows into a river, with four sampling points A, B, C and D along the…
Answer this question and get it marked →The diagram shows a bacterial cell with four parts labelled A, B, C and D. Which part is useful in genetic modification? A B C D
Answer this question and get it marked →Which statement about genetic modification is correct? A It involves choosing which individual organisms are used for breeding. B It is always done using genes from the same…
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