0610_s12_qp_21
A paper of Biology, 0610
Questions:
9
Year:
2012
Paper:
2
Variant:
1
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1
For Examiner's Use Non-living things, such as a car, often show characteristics similar to those of living organisms. State which characteristic of a living organism matches each of the descriptions linked to a car. burning fuel in the engine to release energy headlights that switch on automatically in the dark filling the car’s tank with fuel release of waste gases Identify one characteristic of living things that is not carried out by a car.
1. Characteristics and classification of living organisms  →  1.1. Characteristics of living organisms
3. Movement into and out of cells  →  3.1. Diffusion
1. Characteristics and classification of living organisms  →  1.3. Features of organisms
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2
For Examiner's Use Pollutants can affect the environment. Draw one line from each pollutant listed to an effect it might have on the environment. pollutant carbon monoxide insecticides ionising radiation methane sulfur dioxide untreated sewage effect can cause mutations can cause rise of global temperature can lead to acid rain can poison top carnivores can reduce transport of oxygen in blood can spread diseases, such as cholera Draw the lines on . For Examiner's Use Suggest one major source for each of the following pollutants. carbon monoxide carbon dioxide ionising radiation
20. Human influences on ecosystems  →  20.3. Pollution
10. Diseases and immunity  →  10.1. Diseases and immunity
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3
For Examiner's Use Define diffusion. shows an apparatus that was used to investigate the effect of concentration of a chemical on the rate of diffusion. pieces of damp blue litmus paper at 2 cm intervals cork cork cotton wool soaked in ethanoic acid As ethanoic acid diffused along the tube, the pieces of blue litmus paper turned red. For Examiner's Use Table 3.1 distance of blue litmus paper along tube / cm time for blue litmus paper to turn red / s Complete by plotting the results shown in Table 3.1. Plot the results shown in Table 3.1 on the grid, , on page 6. State which sample of ethanoic acid, A, B or C, took the longest time to travel 8 cm along the tube. State and explain which sample of ethanoic acid was the most concentrated. Substances can enter and leave cells by either diffusion or by osmosis. State two ways in which osmosis differs from diffusion.
3. Movement into and out of cells  →  3.1. Diffusion
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4
For Examiner's Use shows a section through the human female reproductive system. M N O State one function of each of the parts labelled M and N. M N State two functions of the part labelled O. For Examiner's Use When an adult female is not pregnant her menstrual cycle lasts about four weeks. Describe the changes to the uterus and ovaries during one menstrual cycle. Fertilisation may occur after sexual intercourse. Describe the process of fertilisation. Secondary sexual characteristics in females develop at puberty. State the hormone that controls this development. Describe two secondary sexual characteristics controlled by this hormone.
16. Reproduction  →  16.5. Sex hormones in humans
16. Reproduction  →  16.4. Sexual reproduction in humans
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5
For Examiner's Use The skin is important in helping to maintain a constant body temperature. shows a section through human skin. On label and name three structures that help to maintain body temperature. Put your labels and lines on For Examiner's Use When a student has been running, the body temperature usually rises above normal. Explain how sweating and vasodilation help to lower the body temperature. sweating vasodilation Suggest one function of the skin, other than the control of body temperature.
14. Coordination and response  →  14.4. Homeostasis
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7
For Examiner's Use A small population of rabbits was introduced to an island where rabbits had never lived before. shows the change in the size of the rabbit population over a few years. number of rabbits time / years Complete by labelling the four phases of this population growth. • death (use letter D) • exponential (use letter E) • lag (use letter L) • stationary (use letter S) Write the letters D, E, L and S on in the spaces provided. State three factors that could affect the rate of growth of this rabbit population.
19. Organisms and their environment  →  19.4. Populations
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8
For Examiner's Use All organisms depend on enzymes. Define the term enzyme and describe the function of enzymes in living organisms. Samples of an amylase enzyme were incubated with starch at different temperatures. The rate of starch digestion in each sample was recorded and points plotted on the graph shown in . rate of starch digestion / arbitrary units temperature / °C For Examiner's Use Complete this line graph to show the effect of temperature on rate of digestion of starch by the amylase enzyme by adding the most appropriate line to . Put your line on . Using your graph estimate the optimum temperature for this enzyme. Suggest the rate of starch digestion at 37 oC. Describe the effect of temperature on the rate of starch digestion. The enzymes originally incubated at 15 oC and 75 oC did not digest any starch. These samples were later incubated at the optimum temperature. Predict what results could be expected in each sample and suggest reasons for your predictions.
5. Enzymes  →  5.1. Enzymes
7. Human nutrition  →  7.4. Chemical digestion
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9
For Examiner's Use Phloem and xylem are two types of tissue in plants. shows a section through a plant stem, A, and a plant leaf, B. A B Label the phloem (P) and the xylem (on both A and B on . Write the letters P and X on both A and B on . Describe two functions of the xylem. Translocation takes place in the phloem tissue. State which materials are translocated in the phloem. For Examiner's Use shows a plant in the sunlight. The three lines ( ) are arrows, with no arrow heads, showing the translocation of materials within parts of the plant. translocation in the stem translocation in the leaf translocation in the root air soil Add arrow heads to each of the three lines to show the direction of translocation in the organs shown. Put one arrow head on each of the three lines on
8. Transport in plants  →  8.1. Xylem and phloem
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