0610_s13_qp_23
A paper of Biology, 0610
Questions:
9
Year:
2013
Paper:
2
Variant:
3
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1
For Examiner's Use Flowering plants are classified into two groups, the monocotyledons and the eudicotyledons . Complete Table 1.1 to show differences between these two groups. Table 1.1 monocotyledons eudicotyledons number of cotyledons in seed pattern of veins in leaf number of flower parts e.g. petals State two environmental stimuli that flowering plants can detect. shows a cross section of part of a eudicotyledonous plant as seen through a microscope. Name the part of a plant through which the section has been cut. On , draw a line to label the phloem tissue and a line to label the xylem tissue. Label the phloem and xylem tissues. For Examiner's Use Describe two functions of xylem tissue.
16. Reproduction  →  16.3. Sexual reproduction in plants
8. Transport in plants  →  8.1. Xylem and phloem
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3
For Examiner's Use State how a human zygote is formed. Outline the early development of a human zygote before it becomes a fetus. shows the tissues of the mother and fetus in the placenta of humans. blood spaces blood spaces blood spaces maternal artery maternal vein umbilical vein umbilical artery placenta The diagram shows that the blood systems of the mother and the fetus are separate. Suggest one reason why the two blood systems should be kept separate. For Examiner's Use The placenta is often described as “a small intestine, a lung and a kidney”. Explain how the placenta functions like each of these organs. small intestine lung kidney Describe two ways in which a pregnant mother could help the healthy development of her fetus.
16. Reproduction  →  16.4. Sexual reproduction in humans
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4
For Examiner's Use Sulfur dioxide is a pollutant gas produced when some types of fossil fuel are burnt. Describe three undesirable effects of sulfur dioxide pollution. Sulfur dioxide in the air can affect a type of organism called a lichen. shows the numbers of three types of lichen, K, L and M, growing near to an industrial site that releases sulfur dioxide. distance from industrial site / km number of each lichen per 20 m2 lichen K lichen L lichen M State which type of lichen grows closest to the industrial site. State which types of lichen you would expect to find growing 5 km from the industrial site. For Examiner's Use Explain which type of lichen is most affected by the sulfur dioxide. Calculate how many lichen plants you would expect to find in a 20 m2 area at 10 km from the industrial site. Show your working. lichen plants
6. Plant nutrition  →  6.1. Photosynthesis
20. Human influences on ecosystems  →  20.3. Pollution
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5
For Examiner's Use An investigation was carried out by a student on the effect of temperature on the digestion of fat by an enzyme. Name an enzyme that digests fats. One product of fat digestion is fatty acids. Name the other product. Six test-tubes containing the same volume of olive oil and the enzyme solution were set up. One drop of an indicator was added to each test-tube. The six test-tubes were labelled and placed in separate water baths at different temperatures. The indicator was blue at the start and changed to yellow when the pH fell to pH 5 or below. The time for the contents of each test-tube to turn yellow was recorded. Suggest why the pH of the mixture would fall as digestion takes place. For Examiner's Use Table 5.1 shows the results of this investigation. Table 5.1 temperature / °C time to turn yellow / hours Plot the results on . temperature / °C time to turn yellow / hours For Examiner's Use State the temperature at which the reaction was fastest (optimum temperature). Another student repeated the investigation. This student added bile to each test-tube, as well as the enzyme. Explain the function of bile in the digestion of fat. Predict the results of the second investigation. Include in your answer a reference to rate of reaction and optimum temperature.
5. Enzymes  →  5.1. Enzymes
4. Biological molecules  →  4.1. Biological molecules
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6
For Examiner's Use Complete the sentences about respiration by writing the most appropriate wordin each space. Respiration in living cells is a series of chemical reactions that release energy. These chemical reactions are speeded up by . If a yeast cell does not have enough oxygen it may carry out respiration. In this process and carbon dioxide are formed. This type of respiration in yeast is used by humans in In humans, when muscle cells do not have enough oxygen during exercise, is broken down into
12. Respiration  →  12.3. Anaerobic respiration
12. Respiration  →  12.1. Respiration
12. Respiration  →  12.2. Aerobic respiration
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8
For Examiner's Use shows the energy flow through a food chain. organism A kJ trophic level 3 trophic level 2 trophic level 1 1200 kJ 80 kJ 20 kJ energy lost 8800 kJ sun light 1 000 000 kJ lost by reflection 990 000 kJ energy lost 1120 kJ energy lost 60 kJ On , write carnivore, herbivore or producer at the correct trophic level. Use to calculate the quantity of energy trapped by organism A. kJ Name the process by which organism A traps energy. For Examiner's Use State two ways by which energy is lost at each trophic level.
19. Organisms and their environment  →  19.2. Food chains and food webs
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9
For Examiner's Use shows changes in the relative concentrations of four substances in the blood plasma. These changes happen when the blood flows through the renal artery, the capillaries in the kidney and the renal vein. renal artery capillaries in kidney renal vein relative concentrations in blood glucose urea carbon dioxide oxygen Explain the difference in the concentration of urea in the renal vein and in the renal artery. Explain the differences in the concentration of oxygen and carbon dioxide shown in . For Examiner's Use Describe and explain the changes in glucose concentration shown in .
13. Excretion in humans  →  13.1. Excretion in humans
9. Transport in animals  →  9.3. Blood vessels
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