0610_w18_qp_43
A paper of Biology, 0610
Questions:
6
Year:
2018
Paper:
4
Variant:
3
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1
Water is a very important molecule for all living organisms. State the name of the organ in plants where most water is absorbed. State the name of the organ in humans where most water is absorbed. State one property of water that makes it useful to animals and plants. The flow diagram in shows a town and part of the water cycle. J H G F Q P O K L M N Table 1.1 describes some of the processes in the water cycle. Complete Table 1.1. One row has been done for you. Table 1.1 description name of the process letter in nitrate ions are washed into rivers leaching F an algal bloom in the water is caused by leaching of nitrate ions evaporation conversion of water from a vapour to a liquid transpiration Polluted water can be purified at a sewage treatment works. State one reason why it is necessary to treat polluted water before it is used as drinking water. Outline the process of sewage treatment. You may use the letters in in your answer.
3. Movement into and out of cells  →  3.2. Osmosis
20. Human influences on ecosystems  →  20.3. Pollution
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2
The Indian muntjac deer, Muntiacus muntjak, is recorded as the mammal with the lowest number of chromosomes. is an image of the chromosomes in the nucleus of a diploid cell of a female muntjac deer. sex chromosomes State the diploid number of chromosomes for the female muntjac deer. is an image of the chromosomes in the nucleus of a diploid cell of a male muntjac deer. sex chromosomes Describe how the sex chromosomes of the male muntjac deer shown in differ from those of the female shown in . Explain how meiosis can result in variation in a species. Use the words chromosome and gametes in your answer. Another cause of variation is the formation of new alleles. Describe how new alleles can be formed.
17. Inheritance  →  17.4. Monohybrid inheritance
17. Inheritance  →  17.1. Chromosomes, genes and proteins
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3
is a photomicrograph of part of the upper surface of a broad bean leaf, Vicia faba. P On , identify and label two structures that are visible in cell P. State the name of the tissue shown in . The tissue shown in is transparent. Explain why it is important to the plant that the tissue shown in is transparent. Stomata are found on the lower surface of broad bean leaves. Describe the function of stomata. More than 40 years ago, botanists studied the leaves of broad bean plants and discovered that guard cells control the opening and closing of stomata. They found that stomata were open when the guard cells were turgid. Table 3.1 shows some of their measurements. Table 3.1 closed stomata open stomata ion concentration in guard cells / pmol 0.3 2.5 guard cell volume / μm3 4000.0 6500.0 turgor pressure in the guard cells / MPa 2.0 4.8 width of stomatal opening / μm 0.0 8.0 Ions move into guard cells by active transport. Describe how the ions move into the guard cells. Describe and explain how the change in ion concentration causes the guard cell volume to change. Use the information in Table 3.1 in your answer. The botanists left the broad bean plants unattended for three days. During this time the broad bean plants wilted. Suggest two environmental factors that can cause plants to wilt.
6. Plant nutrition  →  6.2. Leaf structure
3. Movement into and out of cells  →  3.2. Osmosis
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4
Glycogen is a storage carbohydrate in animals. Glycogen is made from glucose. Cells that convert glucose to glycogen contain many mitochondria. Suggest why these cells contain many mitochondria. State the type of biological molecule that catalyses reactions such as the conversion of glycogen to glucose. A fetus needs glucose to make glycogen. Describe how a fetus obtains glucose. Fig. 4. 1 shows the concentration of glycogen in the fetus of a domestic cat during pregnancy and immediately after birth. time since fertilisation / days glycogen concentration / μmol per g birth Hormones stimulate changes in the concentration of glycogen in the fetus. Define the term hormone. Calculate the percentage increase in the glycogen concentration in the fetus between day 10 and birth in . Give your answer to the nearest whole number. Show your working. % Describe the changes in glycogen concentration shown in and explain how hormones in the fetus cause these changes. Use data from to support your answer. After birth, cats produce milk to feed their offspring. Human babies can be breast-fed or bottle-fed with formula milk. Outline three disadvantages of breast-feeding.
16. Reproduction  →  16.4. Sexual reproduction in humans
14. Coordination and response  →  14.4. Homeostasis
6. Plant nutrition  →  6.1. Photosynthesis
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5
An ecologist studied variation in a species of xerophyte. Xerophytes are adapted to a particular type of environment. State this type of environment. The ecologist studied the features of the leaves in the species of xerophyte. shows the variation in the type of leaf spike. type of leaf spike type 1 type 2 type 3 number of individuals State the type of variation shown in . Explain why the type of leaf spike is an example of the variation shown in . The ecologist also measured other features of the leaves. shows the variation in leaf feature B. 0–5 6–10 11–15 leaf feature B / arbitrary units 16–20 21–25 number of individuals State two named features of leaves that show the type of variation shown in . After one year, the ecologist recorded the variation in leaf feature B again. The results are shown in . 0–5 6–10 11–15 leaf feature B / arbitrary units 16–20 21–25 number of individuals Suggest one reason for the difference in variation of leaf feature B after one year.
6. Plant nutrition  →  6.2. Leaf structure
18. Variation and selection  →  18.1. Variation
18. Variation and selection  →  18.2. Adaptive features
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6
is a diagram showing some body cells and parts of the human lymphatic and circulatory systems. arteriole lymphatic vessel capillary venule Z A B Y not to scale X Capillaries allow blood to reach most cells in the body. State the name of the process by which oxygen moves from A to Z as shown in . Describe how some of the liquid in A moves to B in . State one component of blood that remains inside the capillaries as the blood flows from X to Y in . Lymphatic vessels are similar in structure to veins. Describe the structure of veins. Describe the role of the lymphatic vessel shown in . Lacteals are another part of the lymphatic system. State where in the body lacteals are found and state their function. location in the body function In the lymphatic system, there are structures that contain large numbers of lymphocytes. State the name of these structures. State the role of lymphocytes.
9. Transport in animals  →  9.3. Blood vessels
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