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Breathing out combines which two characteristics of living organisms?
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Scientists discover a new species of animal. It has a segmented body with two pairs of legs on each segment. To which group of animals does this new species belong?
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The diagram shows an insect.
Use the key to identify the insect.
1 wings present ........................................ go to 2
wings absent ......................................... A
2 two pairs of wings ................................. go to 3
one pair of wings ................................... B
3 wings with circular markings ................. C
wings without circular markings .............. D
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Which feature shows that a cell is a plant cell?
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The diagram shows an image of a chloroplast. The image is 5 cm long. The actual length of the chloroplast is $5 \mu m$. What is the magnification of the image?
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The diagram shows a plant cell which has lost water to its surroundings by osmosis. Which part is the partially permeable membrane?
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What describes active transport?
[Table_1]
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The graph shows how the activity of an enzyme varies with temperature.
What is the best or optimum temperature for this enzyme and at what temperature is the enzyme not working?
[Table_1]
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How does a plant use the sugar that it makes? [Table_1]
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The diagram shows a leaf as seen in cross-section under the microscope.
What are tissues 1, 2 and 3?
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The roots of plants take up nitrates from the soil. What are the nitrates used to make?
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597
Which disease do children suffer from if they do not get enough iron from their diet?
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What is the correct order of the processes that take place in the alimentary canal?
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The diagram shows part of the human alimentary canal.
Which organ produces hydrochloric acid?
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The diagram shows the stem of a plant. A strip of the outer tissue including the phloem has been removed.
How is transport in the plant affected?
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Which changes in atmospheric conditions can cause a plant to wilt?
[Table_1]
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515
Which substance is moved by translocation in a flowering plant?
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The graph shows the thickness of the muscular wall in each of the four chambers of the heart. Which chamber is the right ventricle?
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The diagram shows human blood cells, as seen under a microscope.
What is the function of cell X?
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Which row describes active immunity?
[Table: Depends on phagocytes; Memory cells are produced]
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541
After a race, athletes experience oxygen debt.
The diagram shows how the oxygen debt is removed.
What happens at X?
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What is the equation for aerobic respiration in plants?
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The diagram shows a vertical section through the front part of an eye when viewing a near object.
What describes structures R and S?
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When the blood glucose concentration is low, which hormone is released and which organ releases it? [Table_1]
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The diagram shows seedlings in two experiments on the tropic response of seedlings to gravity and light.
How have the seedlings responded?
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The diagram shows the structure of a sperm cell.
Which part is the flagellum?
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The graph shows a hormone that is involved in controlling the menstrual cycle.
What is the hormone?
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Ernst and Amy have four children of different blood groups, as shown.
What are the genotypes of Ernst and Amy?
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584
What is an adaptive feature of xerophytes?
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What are possible positions in a food chain of a carnivore and a herbivore? [Table_1]
502
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584
The diagram shows part of the nitrogen cycle.
What is process S?
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583
The graph shows the growth of a yeast population.
When was the rate at which cells were dying equal to the rate at which new cells were being formed?
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595
Which structures, found in bacteria, make them useful in genetic engineering?
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Why is yeast used in bread-making?
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An advantage of some genetically modified crop plants is that they will not
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Fertiliser leaks into a river resulting in eutrophication. What is the correct order of events leading to the death of animals in the river?
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