5090_s10_qp_21
A paper of Biology, 5090
Questions:
8
Year:
2010
Paper:
2
Variant:
1
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1
shows what happens to energy as it passes through an herbivorous mammal (an o. 60% of this energy passes through the ox energy contained within food 5% of this energy stored in tissue ticks State the source of the energy in the food eaten by the ox. State the form in which the energy is present in the carbohydrate eaten by the ox. Name the process that makes the remaining 35% of the energy in the food available to the ox. State three ways in which the energy may be used within the ox. 1. 2. 3. For Examiner’s Use The bird on the ox’s back is an oxpecker that feeds both on blood-sucking parasites living on the ox, and on blood from the ox’s wounds. In the space below, draw a food web to show the feeding relationships of the organisms in . Explain why there must always be fewer oxpeckers than ticks in this food web.
19. Relationships of organisms with one another and with the environment  →  19.1. Energy flow
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2
For Examiner’s Use Table 2.1 shows some of the major constituents in a person’s sweat on a warm day (in micrograms per 100 cm3). Table 2.1 nitrogenous compounds (including urea, amino acids and broken-down hormones) glucose sodium chloride 31.5 2.5 3.5 State and explain the effects of sweating on the urine produced during a hotter day. To prevent sweating, some people use a spray that blocks the sweat ducts. Explain why it is important to use an antiperspirant only on those parts of the body, such as under the arms, that produce the most sweat. People who sweat a lot and do not wash regularly may suffer from body odour. Suggest why the regular use of an antibacterial soap is better than an antiperspirant spray for controlling body odour.
14. Coordination and control  →  14.5. Temperature control
13. Excretion  →  13.2. Urinary system
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3
For Examiner’s Use shows a small, deep-rooted bush growing in a warm, dry climate. Branches B and C have a similar number of leaves, but the leaves of branch B are enclosed in a transparent polythene bag that empties into a container. 4 m leaves of branch B leaves of branch C container transparent bag is a graph showing the total volume of water lost by the leaves of each of the two branches during the same day. total volume of water lost time of day / h B C For Examiner’s Use State two environmental factors responsible for the water loss during the day by branch C. For each factor, explain how it affects water loss. factor 1. explanation factor 2. explanation Explain how the volume of water lost from branch B is at first greater, then less than that lost from branch C. Suggest why, even for certain plants that are poisonous to humans, the container in can supply travellers with safe drinking water.
7. Transport in flowering plants  →  7.2. Transpiration and translocation
3. Movement into and out of cells  →  3.1. Diffusion and osmosis
6. Plant nutrition  →  6.2. Leaf structure
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4
For Examiner’s Use and each shows cells from the lining of the trachea. One is from a smoker and one is from a non-smoker. D E Identify D and E in . D E Describe the function of D. and show cross-sections through the alveoli of a smoker and of a non- smoker. walls of alveoli Identify the figures on this page that show the trachea and alveoli of the smoker. Fig. and Fig. For Examiner’s Use Explain how the effect of smoking on the alveoli could affect the general health of a smoker.
9. Human gas exchange  →  9.1. Human gas exchange
12. Disease and immunity  →  12.1. Disease
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5
For Examiner’s Use shows some cells from a root of a plant. pathway G pathway H pathway H cell F pathway G Identify cell F in . F Name the mineral ions absorbed by roots that are essential components of chlorophyll, amino acids. G and H show two different pathways for the uptake of mineral ions from the soil. Explain how ions are taken up via pathway G, even when their concentration in the surrounding soil is very low. For Examiner’s Use Suggest and explain why pathway H is more suited to the entry of ions that are in high concentration in the soil.
7. Transport in flowering plants  →  7.1. Uptake and transport of water and ions
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8
For Examiner’s Use Either Describe how an amino acid molecule passes from the lumen of the ileum to the liver. Describe what could happen to an amino acid molecule from the time it enters the liver to the time its component elements leave the body. For Examiner’s Use Or Define the term mitosis. Describe the role of mitosis in organisms. Explain how the cells of offspring have the same number of chromosomes as the cells of their parents.
13. Excretion  →  13.2. Urinary system
16. Development of organisms and continuity of life  →  16.1. Nuclear division
8. Human nutrition  →  8.3. Absorption and assimilation
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