5090_s09_qp_2
A paper of Biology, 5090
Questions:
8
Year:
2009
Paper:
2
Variant:
0
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1
shows a plant at 08.00 hours and shows the same plant at 18.00 hours on the same day. Name the condition shown by the plant in . For Examiner’s Use State two environmental conditions that may have led to the change in appearance of the plant. 1. 2. Explain how environmental conditions have brought about this change. In the space below, draw and label guard cells and stomata as they would appear in the leaves of the plant in and in . in in
6. Plant nutrition  →  6.2. Leaf structure
1. Cells  →  1.1. Cell structure and function
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2
For Examiner’s Use In the inheritance of the colour of mouse fur, the allele for yellow fur (D) is dominant to the allele for grey fur . Two heterozygous yellow-coloured mice produce offspring. Use a fully labelled genetic diagram to show how the colour of mouse fur is inherited by the offspring. State the expected ratios of genotypes and phenotypes in the offspring. A particular combination of these alleles is known as a ‘lethal’ combination. Young that inherit this combination die in the uterus during the very early stages of development. This results in a 2:1 ratio of fur colour in the surviving offspring. Identify the lethal combination of alleles and explain how you reached this answer. lethal combination explanation
17. Inheritance  →  17.3. Inheritance
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3
For Examiner’s Use is a graph of the temperature in a heap of decomposing organic matter over a period of a month. The temperature changes are caused by the activities of microorganisms in the compost. time / days temperature / °C Name two different types of microorganisms that could cause the changes of temperature shown in . 1. 2. Name a type of microorganism that could not be responsible for the temperature changes and give a reason for your answer. microorganism reason Name a chemical that would be found in the compost in higher concentration at day 30 than at day 1 and explain your answer. chemical explanation For Examiner’s Use The external temperature remained below 30 °C. Explain why the temperature of the compost heap changes between day 0 and day 4. Suggest reasons for the temperature changes between days 16 and 28.
5. Enzymes  →  5.2. Effects of temperature and pH
6. Plant nutrition  →  6.1. Photosynthesis
7. Transport in flowering plants  →  7.2. Transpiration and translocation
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4
For Examiner’s Use shows a pair of kidneys and some associated structures. C D A B Identify structure A in . Peristalsis occurs continually in structure A. Describe and explain how this helps the structure to carry out its function. Identify structure B on and state how the structural features of C and D enabled you to make your identification. structure B structural features of C and D For Examiner’s Use On a hot day, a person consumed only meat before a day of energetic work. Explain the likely changes in the composition of the person’s urine during the day.
13. Excretion  →  13.2. Urinary system
11. Transport in humans  →  11.3. Blood vessels
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5
For Examiner’s Use Over a period of ten years, an antibiotic was used in a hospital to treat an infection. shows the amount of antibiotic used and the proportion of bacteria that survived treatment with the antibiotic over this period of time. time / years arbitrary units proportion of bacteria surviving treatment with the antibiotic / arbitrary units amount of antibiotic used / arbitrary units key Name an antibiotic. State the period of time during which the antibiotic was most effective at treating the infection in the hospital. Suggest and explain possible causes for the increase in the proportion of bacteria that survived treatment with the antibiotic after 1994. For Examiner’s Use Suggest two reasons for the decreased use of this antibiotic after 1997, 1. 2. two possible ways of controlling the infection in the hospital after 1997. 1. 2.
12. Disease and immunity  →  12.2. Antibiotics
17. Inheritance  →  17.4. Selection
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