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5090_s07_qp_2
A paper of Biology, 5090
Questions:
8
Year:
2007
Paper:
2
Variant:
0
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1
shows sections through two different flowers, A and B, that are found on the same plant. One flower is male, the other is female. C flower A flower B C Identify C on State which flower is the male flower and give a reason. flower reason Examiner’s Use State the method of pollination in this plant and give two reasons for your answer. method of pollination reason 1. 2. State two other possible features, not visible on , that are likely to be present in these flowers. 1. 2. In some species, plants with only male flowers occur while other plants have only female flowers. Explain the advantages of this to the species.
16. Development of organisms and continuity of life  →  16.3. Sexual reproduction in plants
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2
Use shows two microscopic structures that are adapted for absorption, one from an animal and the other from a plant. The structures are not drawn to the same magnification. structure D structure E State one feature that these two structures have in common that helps them to carry out their function. Identify each structure and, for each one, name two chemical substances that are absorbed by it. structure D: name chemical substance 1. 2. structure E: name chemical substance 1. 2. Examiner’s Use Structure E in is a single cell. Draw in and label, on , a feature that helps the cell to carry out absorption. Explain how the feature you have drawn and labelled helps the cell to carry out absorption.
6. Plant nutrition  →  6.2. Leaf structure
1. Cells  →  1.1. Cell structure and function
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3
Use When a strip of filter paper is soaked in cobalt chloride solution, it is pink when damp and turns blue when dry. shows strips of dry cobalt chloride paper on the upper and lower surfaces of a leaf, pressed between dry glass slides. cobalt chloride paper leaf, slides and cobalt chloride paper shown in section leaf glass slide elastic band cobalt chloride paper glass slides leaf attached to plant A student used this method to investigate the time taken for strips of cobalt chloride paper to turn from blue to pink. The experiment was performed five times. The results are shown in Table 3.2. Table 3.2 experiment number time (in minutes) taken for paper to change from blue to pink upper surface lower surface Examiner’s Use State the most likely conclusion that could be drawn from the results of experiments 1, 2, 4 and 5. Suggest an explanation for the results of these experiments for the upper surface of the leaf, for the lower surface of the leaf. Suggest two possible reasons for the result obtained for the strip attached to the upper surface of the leaf in experiment 3. 1. 2. Suggest how the student could improve the reliability of this experiment. Suggest how the student could show that the concentration of water vapour coming out of a leaf is greater than its concentration in the atmosphere.
6. Plant nutrition  →  6.1. Photosynthesis
6. Plant nutrition  →  6.2. Leaf structure
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4
Use Microorganisms can be grown in the laboratory on agar (a jelly-like medium) in a Petri dish. Nutrients required by the microorganisms are added to the agar. Name a nutrient that should be added to ensure the maximum rates of respiration growth Respiration and growth are enzyme-controlled processes. A student is provided with a Petri dish containing agar with the optimum concentration of nutrients. Explain how the student could speed up the rate of growth of microorganisms growing in this Petri dish. shows the stages in an experiment to show the effect of different antibiotics on microorganisms. H G J F I G F H J I layer of microorganisms on surface Petri dish clear areas nutrient agar jelly immediately after discs have been placed on the layer of microorganisms 24 hours later discs of filter paper soaked in different antibiotics The microorganisms originally came from the throat of a person suffering from a throat infection. Examiner’s Use Using the information in , identify by letter the antibiotic which might be best for treating the infection, state which type of microorganism was probably causing the throat infection and give a reason for your answer. type of microorganism reason Antibiotic F used to be the most effective in treating the infection. Suggest and explain why it has become less effective.
12. Disease and immunity  →  12.2. Antibiotics
18. Biotechnology and genetic modification  →  18.1. Biotechnology
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5
Use shows some food just before it enters the stomach and the same food as it leaves the stomach four hours later. K N M L On , label structures K and L. The food consisted solely of meat and potatoes. By placing ticks ( ✓ ) in the appropriate boxes in Table 5.2, show how the major components of the food compare at positions M and N. Table 5.2 more at M than at N less at M than at N almost the same at M and N starch protein fibre Examiner’s Use shows the same food at O, and 24 hours later, at P. O P Explain what has happened to the protein between O and P. Name the region of the alimentary canal which will contain fibre in the highest proportion and give reasons for your answer. region of alimentary canal reasons
8. Human nutrition  →  8.2. Human digestive system
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7
With reference to the circulatory system, name an example of each of the following: a cell, a tissue and an organ. Name the main blood vessels carrying blood to and from the liver and describe any differences that there may be between the composition of the blood as it enters and leaves the liver. Question 8 is in the form of an Either/Or question. Answer only question 8 Either or question 8 Or.
11. Transport in humans  →  11.3. Blood vessels
11. Transport in humans  →  11.1. Circulatory system
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