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Some yeast, sugar and water are mixed in a test-tube. The diagrams show the test-tube at the start and after one hour.
Which process causes this change?
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During the process of nutrition, all organisms need to absorb mineral ions and water from their environment. Which other substances do plants and animals need to absorb during this process? [Table_1]
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The shaded area of the diagram represents structures found in both plant and animal cells.
Which cell structure is from the shaded area?
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What is the correct order of increasing size of the following structures, from smallest to largest?
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The actual thickness of the leaf shown in the diagram is 2000µm, but its thickness in the diagram is 50mm.
What is the magnification of the diagram?
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Which statement describes how young plants are supported?
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The diagram shows the order of bases along part of one strand of DNA.
A—C—T—T—A—G—A—T
What is the order of bases on the corresponding part of the other strand?
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Small molecules are used as the basic units in the synthesis of large food molecules. Which statement is correct?
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The diagrams show a protease enzyme catalysing the breaking of part of a protein molecule into smaller pieces. Which diagram has three correct labels?
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Which graph shows the effect of temperature on the activity of an enzyme?
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Which feature is a leaf adaptation for living in the desert?
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In which region of the alimentary canal is maltose digested?
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Which description of the cholera pathogen is correct?
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The diagram shows a fat globule (P) in one part of the alimentary canal and the same globule (Q) as it appears in another part of the alimentary canal.
In which parts of the alimentary canal are P and Q found?
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Which graph shows most clearly what will happen to the rate of transpiration as humidity increases?
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The diagram shows a potted plant and the same plant 24 hours later.
What causes the change in the appearance of the plant?
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The diagram shows a section through the human heart.
Which is the right atrioventricular valve?
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What is a method of reducing the risk of coronary heart disease?
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Which row describes the features of passive immunity? [Table_1]
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What is the path of carbon dioxide as it leaves the lungs?
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When the external intercostal muscles contract, how do the pressure and the volume inside the lungs change?
[Table_1]
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What is an example of excretion in mammals?
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The diagram represents a simple reflex arc.
What is the sequence of nerve cells through which an impulse passes during a reflex action?
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What effect does adrenaline have on blood glucose concentration and pulse rate? [Table_1]
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The diagram shows the density of rods and cones across a horizontal section of the retina. What is the position of the optic nerve?
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A teacher said a way to remember the difference between two groups of cells is 'many, minute and motile' or 'few, fat and fixed'.
What are the groups of cells?
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The diagram shows a flower.
Which processes have taken place?
[Table_1]
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The concentrations of LH and oestrogen are measured during part of a menstrual cycle.
On which day does ovulation occur?
[Table_1]
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Owners of successful race horses hope that the horses' offspring will be like their parents.
How does a young race horse inherit its characteristics?
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Which structures in plant cells build protein molecules under the control of the nucleus?
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In the inheritance of ABO blood groups, when two parents have the genotypes $I^AI^A$ and $I^AI^o$, what is the blood group of their offspring?
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Which characteristic shows discontinuous variation in humans?
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Sickle cell anaemia is determined by the gene $Hb$. $Hb^{A}$ is the allele for normal blood. $Hb^{S}$ is the allele for sickle cell anaemia.
Which combination of parents could result in some children with resistance to malaria and some with all normal red blood cells?
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The diagram shows a pyramid of biomass for a food chain in a woodland ecosystem. What is the pyramid of numbers for this food chain?
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Which process is not part of the water cycle?
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Which process is carried out by bacteria in the root nodules of leguminous plants?
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A gene for insulin is taken from a human cell and placed in a bacterium. The bacterium can then make human insulin. What is this process called?
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When a river is polluted by fertiliser, the following processes may occur.
1 increased aerobic respiration of decomposers
2 increased growth of producers
3 decreased oxygen concentration in the water
What is the correct sequence for these processes?
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The diagram shows the positions of four farms and the concentrations of nitrate at different points in a river. Which farm is likely to have been using too much fertiliser on its land?
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