5090_s11_qp_21
A paper of Biology, 5090
Questions:
9
Year:
2011
Paper:
2
Variant:
1
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1
shows how, in 1951, some compounds of mercury (an inorganic substance) entered and passed along a food chain. factory waste mercury compounds from factory sea small plants and animals small fish large fish fishermen and their families Name a producer in . Table 1.2 shows the concentration of mercury in parts per billion in unpolluted sea water, in polluted seawater, in the flesh of the small fish and in the flesh of the large fish. Table 1.2 unpolluted seawater / ppb polluted seawater / ppb flesh of small fish / ppb flesh of large fish / ppb 0.1 2.0 20 000 Calculate how many times more concentrated the mercury is in the polluted seawater than in the unpolluted seawater. Explain why the concentration of mercury changed with each successive member of the food chain. Suggest why many of the fishermen and their families suffered from mental illness.
19. Relationships of organisms with one another and with the environment  →  19.4. Effects of humans on ecosystems
8. Human nutrition  →  8.2. Human digestive system
19. Relationships of organisms with one another and with the environment  →  19.5. Conservation
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2
shows an experiment on the uptake of water by a leafy shoot placed in a light, breezy environment. rubber tube connection capillary tube black polythene cover leafy shoot air bubble water Explain what is likely to happen to the air bubble in the capillary tube. The black polythene cover is then placed over the plant. State the effect this is likely to have on what happens to the bubble. Explain your answer to b.
3. Movement into and out of cells  →  3.1. Diffusion and osmosis
7. Transport in flowering plants  →  7.1. Uptake and transport of water and ions
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3
shows some stages in human reproduction. baby 1 embryo embryo ovum C B A baby 2 sperm Name the process about to occur at A and state where in the reproductive system it normally occurs. process where it occurs Name the type of cell division taking place at B and C. The two embryos develop, are born and grow to become adults. Suggest two ways in which these two adults must be similar to each other, and explain your answers. 1. 2. explanation Suggest two ways in which they may differ from one another, and explain your answers. 1. 2. explanation
16. Development of organisms and continuity of life  →  16.4. Sexual reproduction in humans
16. Development of organisms and continuity of life  →  16.1. Nuclear division
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4
shows a section through a flower. A pollen grain has been deposited on the carpel. E pollen grain F G H I D Name the process that has occurred in bringing the pollen grain to the carpel. State how this process has been brought about in this flower and give two reasons for your answer. how the process has been brought about reason 1 reason 2 On , draw and label the pollen tube and the nuclei as they would appear just before the nuclei fuse. Changes occur in the flower after the nuclei fuse. Use the letters in to identify • the parts of the flower that will die as the fruit is formed • the part of the flower that will form the testa • the part of the flower that will form the fruit wall.
16. Development of organisms and continuity of life  →  16.3. Sexual reproduction in plants
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5
shows the percentage of undigested molecules of starch as they pass through the alimentary canal. K duodenum mouth cavity percentage of undigested starch molecules L N M region of alimentary canal Name the parts of the alimentary canal represented by K and L. K L State and explain what happens to the digestion of starch between M and N. Explain why the curve is not shown extending into region L of the graph.
8. Human nutrition  →  8.3. Absorption and assimilation
8. Human nutrition  →  8.2. Human digestive system
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