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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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Which name is given to a group of individuals that can reproduce to produce fertile offspring?
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Use the key to identify the animal shown in the diagram.
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Which row matches the cell membrane and cell wall of a palisade cell to their functions? [Table_1]
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In a plant, what is formed by a group of xylem vessels?
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What are the functions of xylem vessels?
[Table_1] showing the functions: absorption, conduction, photosynthesis, support with options A, B, C, D.
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Active transport is the movement of
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The diagram shows an experiment to demonstrate the movement of molecules.
After one hour, the water in the beaker turned red.
What is the most likely reason for this colour change?
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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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Which graph shows the effect of temperature on the activity of an enzyme?
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The diagram represents enzyme action.
What are parts W, X and Y in this chemical reaction?
[Table_1]
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In a photosynthesis experiment, a plant is left in bright sunlight for several hours. A leaf is then removed from the plant and tested for starch, using iodine solution.
The diagram shows the leaf from the plant that was used in the experiment.
Which diagram shows the result of the experiment?
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Which substance, needed for protein synthesis, is carried into a leaf from the stem?
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Which type of food is not digested before being absorbed by the body?
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The diagram shows the human alimentary canal.
In which structure is most glucose absorbed into the blood?
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Which dietary component is \textbf{unlikely} to be deficient in a meat-free diet?
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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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Which substances are dissolved in human blood plasma?
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Which chamber of the heart has the thickest muscle wall?
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What is the approximate percentage of oxygen in expired air?
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Compared with atmospheric air, air breathed out by a human contains
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What is produced by anaerobic respiration in yeast?
[Table_1]
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What is the word equation for aerobic respiration in plants?
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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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The diagram shows a neurone.
Which structures could be found at X and Y?
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What will be the effect of strenuous exercise on the volume of water lost through the skin and the kidneys?
[Table_1]
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Which organ is most often damaged by regularly drinking too much alcohol?
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When a baby is born, these processes occur.
1 breaking of the amniotic sac
2 contraction of muscles in the uterus wall
3 cutting of the umbilical cord
In which order do these processes usually occur?
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The diagrams show pollen grains from three different species of plant as they appear under the microscope. The diagrams are all to the same scale.
Which pollen grains are involved in insect-pollination?
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The diagram shows the human female reproductive system.
If a woman uses a femidom as a contraceptive, where would it be placed?
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Cells are formed by the division of existing cells. Four different cells are shown.
Which cell is produced by meiosis?
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Albinism is an inherited condition in which pigment does not develop in the skin, hair and eyes.
The allele for albinism is recessive.
What are the chances of albino parents having an albino child?
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Which name is given to the observable features of an organism?
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What is not a feature of natural selection?
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The graph shows a population growth curve.
Which factors would cause region X on the graph to become steeper?
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The diagram shows a simple food chain.
green plant → herbivore → carnivore
If a disease causes the number of herbivores to decrease, what will be the effect on the numbers of green plants and carnivores?
[Table_1]
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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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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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