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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?
580
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506
Phototropism demonstrates which two characteristics of living organisms?
569
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554
The table shows the scientific names and the common names of four plants.
[Table_1]
Which word in their names shows that two of the plants share the greatest number of features?
533
537
575
What is the correct order of increasing size of the following structures, from smallest to largest?
535
519
535
In a plant, what is formed by a group of xylem vessels?
510
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563
The shaded area of the diagram represents structures found in both plant and animal cells.
Which cell structure is from the shaded area?
534
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585
A jar of air was placed upside down on top of a jar containing a brown gas as shown.
Which process has taken place?
561
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524
Which statement describes how young plants are supported?
532
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535
Small molecules are used as the basic units in the synthesis of large food molecules.
Which statement is correct?
576
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510
The diagram represents a chemical reaction.
Which diagram represents the enzyme for this reaction?
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Which graph shows the effect of temperature on the activity of an enzyme?
[Image_1: Four graphs labeled A, B, C, D showing enzyme activity against temperature (°C)]
516
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Four test-tubes are set up as shown in the diagram and left in full sunlight.
After several hours, which test-tube contains the most dissolved oxygen?
537
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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 treatment is best for a person with persistent diarrhoea?
539
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522
Which type of food is not digested before being absorbed by the body?
565
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533
Which graph shows most clearly what will happen to the rate of transpiration as humidity increases?
570
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524
The diagram shows a potted plant and the same plant 24 hours later.
What causes the change in the appearance of the plant?
551
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526
Which blood vessel has a high carbon dioxide concentration, a low oxygen concentration and a high blood pressure?
512
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589
Which substances are dissolved in human blood plasma?
600
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583
What is the path of carbon dioxide as it leaves the lungs?
538
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In some amphibians, gas exchange occurs through the whole skin surface. What are the most likely characteristics of the skin surface? [Table_1]
546
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511
Which description of anaerobic respiration in yeast is correct?
[Table with options provided]
The table gives options for whether it produces alcohol and if it releases more energy than aerobic respiration.
506
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530
What is an example of excretion in mammals?
538
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565
A person has been sitting in a room at 35°C for 30 minutes. What would be the effect of then drinking several glasses of iced water?
539
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526
The diagram represents a simple reflex arc.
What is the sequence of nerve cells through which an impulse passes during a reflex action?
541
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517
What is an example of gravitropism?
581
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518
Which organ produces a hormone?
553
588
572
What is a result of the excessive intake of alcohol?
535
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The table shows the conditions provided for four sets of seeds. Which of the seeds germinate? [Table_1]
545
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The diagram shows a human female’s reproductive organs. What is the name of structure X?
518
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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?
579
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In pea plants the allele for tall, T, is dominant to the allele for dwarf, t.
Which cross would produce plants in the proportion of 1 tall : 1 dwarf?
562
600
591
Which name is given to the observable features of an organism?
504
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501
Which characteristic shows discontinuous variation in humans?
588
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599
The graph shows the increase in the human population of the world since 1630.
What was the longest time taken for the population to double?
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The diagram shows a food chain.
tree \( \rightarrow \) small insects \( \rightarrow \) small birds \( \rightarrow \) birds of prey
What is the correct pyramid of numbers for this food chain?
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560
Which process is not part of the water cycle?
524
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585
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?
552
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504
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?
567
536
559
