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What are characteristics of all living organisms?
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Using the binomial system, the name of a lion is *Panthera leo*.
Which statement is correct?
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The diagram shows an organism called Chlamydomonas.
Which processes can Chlamydomonas carry out?
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The diagram shows the structure of a palisade cell from a leaf. Which structure contains chlorophyll?
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A diagram of a white blood cell has a diameter of 76 mm. The magnification of the diagram is \times 8000.
What is the actual diameter of the white blood cell?
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Which diagram shows the appearance of a plant cell after it is placed in pure water?
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Which process requires active transport?
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Which row shows the chemical elements contained in fats? [Table_1]
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Glycogen is a large molecule made from smaller molecules. Which smaller molecules is glycogen made from?
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The graph shows the effect of temperature on the rate of a reaction catalysed by an enzyme. [Graph Image]\nWhich statement explains the shape of the graph at section X?
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During growth, potato plants produce flowers and underground storage organs called tubers. During this time, which parts of the plant act as sources and sinks for translocation? [Table_1]
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The diagram shows an experiment investigating the effect of light intensity on an aquatic plant.
Photosynthesis occurred in both test-tube P and test-tube Q. Both test-tubes were kept at the same temperature. The number of bubbles produced in test-tube P was 12 bubbles per minute.
What is the most likely number of bubbles produced in one minute in test-tube Q?
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Which human teeth are used for biting and cutting food?
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The diagram shows part of the human digestive system. Which organ produces hydrochloric acid?
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The diagram shows the structure of a villus. The artery, capillary, lacteal, and vein are labeled with letters. Which letter shows where nutrients are absorbed into the blood?
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By which process is water vapour lost from a leaf?
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The pathway taken by water through a plant is shown.
root hair cells \rightarrow root cortex cells \rightarrow Z \rightarrow mesophyll cells
Which part of the pathway is Z?
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The graph shows the thickness of the muscular wall in each of the four chambers of the mammalian heart. Which chamber is the right ventricle?
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Which row shows correct features of the circulatory system of a fish? [Table_1]
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Cholera infection can cause the following events. 1. Cells lining the small intestine secrete chloride ions. 2. Cholera bacteria produce a toxin. 3. Chloride ions move into the small intestine. 4. Water from the blood moves into the small intestine by osmosis. 5. Water potential of fluid in the small intestine becomes lower. Which sequence of events will cause diarrhoea?
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Which row shows the composition of expired air from a healthy person? [Table_1]
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The table shows the relative concentrations of urea in the blood entering and leaving the kidneys and liver.
Which row is correct?
[Table_1]
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Which statement about anaerobic respiration is correct?
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During exercise, an oxygen debt may occur in muscles. What is the cause of this oxygen debt?
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The diagram shows parts of the body involved in excretion in humans.
What are the labelled parts? [Table_1]
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The diagram shows a reflex action when a person touches a hot object and pulls their hand away.\n\n\n\nWhich letter correctly identifies a structure?
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A light source is placed on one side of a growing plant. What is the correct explanation of the role of auxin in shoot growth?
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Which statement about antibiotics is correct?
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The graph shows the number of cases of disease caused by MRSA bacteria in hospitals in one city between 1998 and 2010. What was the percentage change in the number of cases between 2002 and 2003?
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Some descriptions of reproduction are listed. 1. formation of a zygote with a diploid nucleus 2. formation of a zygote with a haploid nucleus 3. fusion of diploid nuclei of two gametes 4. fusion of haploid nuclei of two gametes Which are correct descriptions of sexual reproduction in humans?
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Which statement about pollination in plants is correct?
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The graph shows the changes in the concentration of a hormone that is involved in controlling the menstrual cycle. What is the hormone?
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Pea plants produce either yellow or green seeds. Yellow (Y) is dominant to green (y). What are the most likely phenotypes of the offspring of a cross between YY and Yy plants?
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The diagram shows the chromosomes of a cell after they have replicated and just before the cell divides by mitosis. Which pair of cells will be produced at the end of mitosis?
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The table shows the number of stomata per mm$^2$ on the upper and lower epidermis of four different plants. Which plant is most likely to be a hydrophytic plant? [Table_1]
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In which process in the nitrogen cycle do microorganisms take nitrogen from the air and convert it into nitrogen compounds?
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An increased concentration of nitrates in water may result in the death of fish because of eutrophication.
Some stages of eutrophication are given.
1. increased aerobic respiration by decomposers
2. increased decomposition after death of producers
3. increased growth of producers
4. reduction in dissolved oxygen
What is the order of these stages that results in the death of fish?
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Which word describes the number of different species in an area?
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Which statement is an advantage of genetically modifying crops?
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Which statements are correct descriptions of parts of the process of protein synthesis?
1. Amino acids are made by the ribosomes.
2. mRNA is copied.
3. The gene coding for the protein moves into the nucleus.
4. The ribosome assembles the amino acids into protein molecules.
5. The sequence of amino acids is determined by the sequence of bases in the mRNA.
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