Home > Biology O LevelVariant 1 May/June 2016 Report a question What’s wrong with this question? You cannot submit an empty report. Please add some details. 0% Variant 1 May/June 2016 1. The actual thickness of the leaf shown in the diagram is 2000 ฮผm, but its thickness in the diagram is 50 mm. What is the magnification of the diagram? ร100 ร0.025 ร25 ร100 000 2. A gene for insulin is taken from a human cell and placed in a bacterium. The bacterium can then make human insulin. What is this process called? natural selection artificial selection genetic engineering heterozygous inheritance 3. Which part of a pathogen is recognised by the immune system? antigen active site antibody antibiotic 4. What is the function of bile? to provide enzymes for fat digestion to increase the surface area of fats for digestion to emulsify starch to acidify food entering the duodenum 5. What is not a result of cholera infection? loss of salts from blood severe diarrhoea intestinal blockage severe dehydration of body tissues 6. Which effect is least likely to occur as a result of deforestation? an increase in the level of carbon dioxide in the atmosphere an increase in soil erosion an increased risk of flooding an increase in biodiversity 7. Which organelles are present in large numbers in cells that produce insulin? ribosomes and mitochondria vesicles and nuclei rough endoplasmic reticulum and cell walls nuclei and mitochondria 8. Which graph shows the effect of temperature on the activity of an enzyme? C D B A 9. Which structures are present in a bacterial cell? D C A B 10. An amino acid is deaminated. This is the removal of the sulfur-containing part. the nitrogen-containing part. the oxygen-containing part. the carbon-containing part. 11. The diagram shows a villus. The arrows show the direction of flow within vessels associated with the villus. Which vessel carries blood to the liver? B C D A 12. Use the key to identify the animal shown in the diagram. Argyroneta Dytiscus Asellus Hexagenia 13. The diagram shows an experiment on osmosis. Which arrow shows the direction of the net movement of water at the start of the experiment? C A B D 14. Which graph shows most clearly what will happen to the rate of transpiration as humidity increases? C B D A 15. Which name is given to a group of individuals that can reproduce to produce fertile offspring? an organ system a genus a kingdom a species 16. When bases pair up in the formation of DNA, what is one of the pairings? G with A G with T G with C G with G 17. The diagram shows a potted plant and the same plant 24 hours later. What causes the change in the appearance of the plant? Water loss is greater than water uptake. Water uptake is equal to water loss. Water uptake is greater than water loss. Water moves from the leaves to the stem. 18. The diagram represents enzyme action. What are parts W, X and Y in this chemical reaction? A C D B 19. Active transport is the movement of particles from a region of lower concentration to a region of higher concentration using energy from respiration. urine by relaxation of a sphincter muscle in the bladder. water through a partially permeable membrane from a more dilute to a more concentrated solution. molecules from a region of their higher concentration to a region of their lower concentration. 20. The diagram shows a pyramid of biomass for a food chain in a woodland ecosystem. What is the pyramid of numbers for this food chain? D A B C 21. 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 changed over time. When is the best time to collect the penicillin? at 5 days at 3 days at 1.5 days at 3.5 days 22. The diagram represents a simple reflex arc. What is the sequence of nerve cells through which an impulse passes during a reflex action? D B C A 23. The diagram shows part of the nitrogen cycle. At which stage is denitrification occurring? D A C B 24. What are advantages of sexual and asexual reproduction? B A C D 25. Some yeast, sugar and water are mixed in a test-tube. The diagrams show the test-tube at the start and after one hour. growth sensitivity reproduction respiration 26. What describes the actions of the intercostal muscles and the diaphragm when we breathe out? B A C D 27. What is the word equation for aerobic respiration in plants? glucose + carbon dioxide โ water + oxygen glucose + oxygen โ carbon dioxide + water glucose + water โ carbon dioxide + oxygen carbon dioxide + water โ glucose + oxygen 28. The diagrams show pollen grains from three different species of plant as they appear under the microscope. The diagrams are all to the same scale. Which pollen grains are involved in insect-pollination? 1 only 3 only 2 and 3 1 and 2 29. Compared with atmospheric air, air breathed out by a human contains less water vapour, more carbon dioxide. more water vapour, less carbon dioxide. less water vapour, less carbon dioxide. more water vapour, more carbon dioxide. 30. The diagram shows a section through the human heart. Which is the right atrioventricular valve? D A B C 31. Two similar leaves are set up in test-tubes as shown. One is exposed to light, while the other is kept in the dark. After a few hours, which colour would the hydrogencarbonate indicator solution be in each tube? D A B C 32. In the inheritance of ABO blood groups, when two parents have the genotypes, IAIA and IAIowhat is the blood group of their offspring? group B group O group A group AB 33. Small molecules are used as the basic units in the synthesis of large food molecules. Which statement is correct? Glycerol is a basic unit of oils. Fatty acids are basic units of glycogen. Simple sugar is a basic unit of protein. Amino acids are basic units of carbohydrates. 34. Which organ is most often damaged by regularly drinking too much alcohol? heart pancreas liver stomach 35. The diagram shows the positions of four farms and the concentrations of nitrate at different points in a river. Which farm is likely to have been using too much fertiliser on its land? D B C A 36. What happens to the chromosome number after meiosis and after mitosis? C B A D 37. What are the effects of insulin and glucagon on the concentration of blood glucose? D B C A 38. What is the function of lymphocytes in the blood? transport of hormones blood clotting phagocytosis antibody production 39. The whole of an islandโs population of short-haired bumblebees is descended from just two parents. These were introduced from the mainland. Which statement about the islandโs short-haired bumblebee population, compared with that of the mainland, is correct? The population is less in danger of collapsing from disease. The population will adapt to environmental changes more slowly. The population shows more genetic variety. The population is more able to adapt to environmental changes. 40. The diagram shows the density of rods and cones across a horizontal section of the retina. What is the position of the optic nerve? C D A B Your score is The average score is 0% 0% Restart quiz
