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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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A rat has the scientific name _Rattus rattus_.
What do the two parts of this name refer to?
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The diagram shows a bird that lives near rivers.
Use the key to identify the bird shown in the diagram.
1. toes joined by a flap of skin ... go to 2
toes separate ................... A heron
2. beak as long or longer than the head ......... go to 3
beak not as long as the head ........... B little grebe
3. top of head black .................. C avocet
top of head white .................. D mute swan
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In a plant, what is formed by a group of xylem vessels?
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The diagram shows a palisade mesophyll cell.
Which structure is not found in an animal cell?
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Which statement is correct for phloem but not for xylem?
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Why does oxygen diffuse into the blood from an alveolus in the lungs?
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The diagram shows water and sugar molecules on either side of a partially permeable membrane.
What happens during osmosis?
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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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When a substance is added to meat, amino acids are produced. What is this substance?
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Which graph shows the effect of temperature on the activity of an enzyme?
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Which two substances are the products of photosynthesis?
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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 type of food is not digested before being absorbed by the body?
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The bacterium \textit{Salmonella enterica} can cause severe food poisoning and the lining of the alimentary canal may be damaged. In these cases absorption of digested food products cannot easily take place.
Which region of the alimentary canal is most affected?
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The diagram shows some of the organs of the human body.
In which organs does the digestion of proteins take place?
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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 graph shows most clearly what will happen to the rate of transpiration as humidity increases?
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The diagram shows the human heart and some of the blood vessels connected to it.
Before blood in W reaches Z it must
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Which substances are dissolved in human blood plasma?
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What are the approximate percentages of oxygen and carbon dioxide in atmospheric air? [Table_1]
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Which route is taken by air passing from the lungs of a human to the atmosphere?
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During aerobic respiration glucose is broken down. What is released in this process?
[Table_1]
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Which processes depend on the action of enzymes?
1. digestion
2. osmosis
3. respiration
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Which diet will cause the liver to produce the most urea?
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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 section through an eye.
Which structure controls how much light enters the pupil?
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What are the effects of adrenaline?
[Table_1]
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In which conditions will seeds germinate most quickly?
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What are the characteristics of asexual reproduction? [Table_1]
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The diagram represents processes in sexual reproduction.
[Image_1: Diagram of cells in reproductive organs, gametes, zygote, and cells of embryo with Q and R stages indicated.]
Which processes are represented by stages Q and R?
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Which name is given to the observable features of an organism?
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Which structure will be found in the nucleus of a body cell in a woman?
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In the food chain below, the population of snakes is halved owing to a viral disease.
grass → locusts → snakes → eagles
What effect does this have on the other members of the food chain?
[Table_1]
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Which is an example of a population?
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The diagram represents the carbon cycle.
Which process is represented by arrow X?
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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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