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. 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? A D B C 2. Which graph shows most clearly what will happen to the rate of transpiration as humidity increases? D A C B 3. Which organ is most often damaged by regularly drinking too much alcohol? liver pancreas stomach heart 4. Which organelles are present in large numbers in cells that produce insulin? ribosomes and mitochondria rough endoplasmic reticulum and cell walls vesicles and nuclei nuclei and mitochondria 5. 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 and 2 3 only 1 only 2 and 3 6. When bases pair up in the formation of DNA, what is one of the pairings? G with A G with T G with G G with C 7. What describes the actions of the intercostal muscles and the diaphragm when we breathe out? B D C A 8. What happens to the chromosome number after meiosis and after mitosis? A C D B 9. An amino acid is deaminated. This is the removal of the nitrogen-containing part. the oxygen-containing part. the sulfur-containing part. the carbon-containing part. 10. 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 ร25 ร100 000 ร0.025 11. The diagram shows part of the nitrogen cycle. At which stage is denitrification occurring? D B C A 12. Some yeast, sugar and water are mixed in a test-tube. The diagrams show the test-tube at the start and after one hour. sensitivity respiration growth reproduction 13. 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 A C 14. Which part of a pathogen is recognised by the immune system? antibiotic antigen antibody active site 15. Which structures are present in a bacterial cell? A D B C 16. The diagram shows a section through the human heart. Which is the right atrioventricular valve? C B A D 17. What is the function of bile? to acidify food entering the duodenum to increase the surface area of fats for digestion to emulsify starch to provide enzymes for fat digestion 18. Active transport is the movement of urine by relaxation of a sphincter muscle in the bladder. molecules from a region of their higher concentration to a region of their lower concentration. water through a partially permeable membrane from a more dilute to a more concentrated solution. particles from a region of lower concentration to a region of higher concentration using energy from respiration. 19. What is the function of lymphocytes in the blood? blood clotting phagocytosis antibody production transport of hormones 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? A B D C 21. 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 A D B 22. The diagram represents enzyme action. What are parts W, X and Y in this chemical reaction? A D C B 23. The diagram represents a simple reflex arc. What is the sequence of nerve cells through which an impulse passes during a reflex action? D C A B 24. 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 3.5 days at 1.5 days at 3 days at 5 days 25. 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 shows more genetic variety. The population is less in danger of collapsing from disease. The population is more able to adapt to environmental changes. The population will adapt to environmental changes more slowly. 26. In the inheritance of ABO blood groups, when two parents have the genotypes, IAIA and IAIowhat is the blood group of their offspring? group O group B group A group AB 27. What are advantages of sexual and asexual reproduction? B D A C 28. Small molecules are used as the basic units in the synthesis of large food molecules. Which statement is correct? Fatty acids are basic units of glycogen. Glycerol is a basic unit of oils. Simple sugar is a basic unit of protein. Amino acids are basic units of carbohydrates. 29. Compared with atmospheric air, air breathed out by a human contains less water vapour, more carbon dioxide. more water vapour, less carbon dioxide. more water vapour, more carbon dioxide. less water vapour, less carbon dioxide. 30. 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? C B D A 31. What is the word equation for aerobic respiration in plants? carbon dioxide + water โ glucose + oxygen glucose + oxygen โ carbon dioxide + water glucose + water โ carbon dioxide + oxygen glucose + carbon dioxide โ water + oxygen 32. The diagram shows a potted plant and the same plant 24 hours later. What causes the change in the appearance of the plant? Water moves from the leaves to the stem. Water uptake is equal to water loss. Water uptake is greater than water loss. Water loss is greater than water uptake. 33. Which graph shows the effect of temperature on the activity of an enzyme? A C B D 34. What is not a result of cholera infection? severe dehydration of body tissues loss of salts from blood severe diarrhoea intestinal blockage 35. Use the key to identify the animal shown in the diagram. Hexagenia Argyroneta Asellus Dytiscus 36. 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? artificial selection genetic engineering heterozygous inheritance natural selection 37. What are the effects of insulin and glucagon on the concentration of blood glucose? C A D B 38. The diagram shows an experiment on osmosis. Which arrow shows the direction of the net movement of water at the start of the experiment? B D A C 39. Which name is given to a group of individuals that can reproduce to produce fertile offspring? a genus a kingdom a species an organ system 40. Which effect is least likely to occur as a result of deforestation? an increase in biodiversity an increase in soil erosion an increase in the level of carbon dioxide in the atmosphere an increased risk of flooding Your score is The average score is 0% 0% Restart quiz
