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The plant *Mimosa pudica* has leaves that fold in when touched. This demonstrates movement and which other characteristic?
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The diagram shows a section of DNA from a chimpanzee.
Which diagram shows a section of DNA from the organism that is most closely related to the chimpanzee?
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The diagrams show structures associated with a leaf.
What is the level of organisation of the part shown in detail?
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The diagram shows a pollen grain of a rice plant. The size of the image is 40mm.
The actual length of the pollen grain is 40\mu m.
By how many times has the diagram been magnified?
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Three equally sized pieces of potato were put into different concentrations of sucrose solution. One piece of potato was put into distilled water.
The concentrations of sucrose solution were $0.2 \text{g dm}^{-3}$, $0.4 \text{g dm}^{-3}$ and $0.6 \text{g dm}^{-3}$.
The graph shows the change in mass of the potato pieces over a period of 60 minutes.
Which piece of potato was put into distilled water?
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A red blood cell and a palisade mesophyll cell are placed in a solution which has a higher water potential than the cells.
What will happen to each cell?
[Table_1]
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The diagram shows an evolutionary tree based on a computer-generated study of different sea mammals.
According to this evolutionary tree, which whale has DNA base sequences that are least shared with the other whales?
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What is the colour change shown by Benedict’s solution when heated with a reducing sugar?
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Into which part of the alimentary canal is the enzyme that digests starch secreted?
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The diagram shows an enzyme with its substrate and product molecules.
Which form an enzyme-substrate complex?
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The diagram shows the apparatus at the beginning of an investigation into temperature change during the germination of seeds. The temperature at the start of the investigation was 25°C in both flasks.
After two days the temperature in flask 1 is 25°C. The temperature in flask 2 is 28°C.
Which characteristic of living organisms is shown in this experiment?
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What must be increased in the diet of a person suffering from constipation?
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Which substrate, enzyme and product are correctly named?
[Table_1]
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The diagram shows the human alimentary canal, with a string marked in metres beside it.
How long is the small intestine?
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What is a description of transpiration?
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The diagram represents the circulatory system of a mammal.
In which chamber of the heart are the muscle walls thickest?
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The diagram shows a cross-section through a human blood vessel.
Which type of blood vessel does the diagram show?
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What can be passed from one person to another during blood transfusion?
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The table shows some of the changes that occur during breathing.
[Table_1]
Which changes occur to cause inspiration?
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In an experiment to investigate anaerobic respiration, two bottles are set up in a warm room, as shown.
What would happen to each balloon after one day?
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Two pieces of an aquatic plant were placed into two different test-tubes, P and Q. Each test-tube contained hydrogencarbonate indicator and was sealed and kept at 20°C. Test-tube P was kept in the light and test-tube Q was kept in the dark. The table shows the effect of carbon dioxide on the colour of the hydrogencarbonate indicator. [Table_1]
What would the colour of the indicator be after 12 hours?
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What is the most important function of sweating?
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A student begins to lose control of her bicycle while travelling down a hill at speed.
The concentration of which substance will begin to increase rapidly in her blood?
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The diagram shows a person sweating in hot weather.
What part is played by sweat glands during the process of sweating?
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The diagram shows a synapse in a reflex arc.
What are the identities of the two neurones and in which direction does the neurotransmitter pass?
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Which process occurring at a synapse is prevented by the presence of heroin?
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The diagram shows half a flower.
After pollination, where would pollen grains be found?
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Which environmental factor is not always a requirement for seed germination?
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A pure-breeding white rat was crossed with a pure-breeding black rat. All their offspring were black. One of the offspring was bred with a pure-breeding white rat. What is the most likely percentage of black rats in the offspring?
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An organism is heterozygous for a gene with the alleles T and t.
Which diagram represents a diploid cell from this organism?
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Red-green colour blindness is a sex-linked characteristic caused by a recessive allele.
Which prediction can be made about the children of a woman who is colour-blind and a man with normal vision?
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The diagram shows a vertical section through a leaf.
Which diagram shows the plant that the leaf was taken from?
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The biomass at each trophic level in an ecosystem is measured. The results are shown in the table.
Which trophic level contains herbivores?
[Table_1]
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The diagram shows a food web.
What do the arrows represent?
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Ligase enzymes are used in genetic engineering to
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With which kingdoms do bacteria share the same genetic code?
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What is a direct result of deforestation?
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The table shows the ability of three species of fish and their eggs to survive in water at different pH levels.
If the eggs do not survive offspring cannot be produced.
[Table_1]
A lake at pH 6.0 contains breeding populations of all three fish.
If acid rain causes the pH to fall to 5.0, which outcome would be likely to occur?
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