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The diagram illustrates some of the processes carried out by living organisms.
Which characteristic of living organisms is represented by arrow X?
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The statements describe four different plants. Which plant must be a monocotyledon?
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557
The diagram shows four arthropods.
[Image with four arthropods labeled: Pediculus \times 20, Anopheles \times 10, Dermacentor \times 7, Carcinus \times 0.5]
How many of these arthropods are insects?
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600
The diagram shows an animal.
Use the key to identify this animal.
1 body covered with scales .......... go to 2
body covered with hair .......... go to 3
2 has a rounded bill .......... A
has a pointed bill .......... B
3 has webbed feet .......... C
does not have webbed feet .......... D
572
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577
Which diagram shows chloroplasts in their correct position in a plant cell?
501
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501
The diagram shows a plant cell.
Which features show that it is a plant cell?
592
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585
Which is \textit{not} an organ?
523
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500
What results from the destruction of cilia in the trachea due to smoking?
510
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How do carbon dioxide and oxygen move in and out of a mesophyll cell?
550
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534
Which statements are correct for both diffusion and osmosis?
[Table_1]
513
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559
An enzyme in potato cells causes oxygen to be produced from hydrogen peroxide.
Cubes of potato were incubated with hydrogen peroxide at different temperatures.
The numbers of bubbles of oxygen released per minute were counted at each temperature.
The table shows the results.
[Table_1]
The results suggest the optimum temperature for the enzyme is between which two values?
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548
The diagram shows an experiment on the digestion of the protein in egg albumen by protease. The protease was taken from a human stomach. In which test-tube will the protein be digested most quickly?
568
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523
Which row shows the elements and basic units that are used in the construction of large food molecules?
[Table_1]
589
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506
The diagram shows part of the human alimentary canal. In which part does protein digestion begin?
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Poor nutrition can lead to a condition called rickets in which bones fail to develop properly. The table shows some minerals and vitamins present in four foods. Which food would be best for a child who has rickets? [Table_1]
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The diagram shows a plant shoot and the same shoot six hours later.
Which change in environmental conditions could cause this change in the shoot?
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502
A celery stalk is placed in a beaker of blue dye. Once the dye reaches the leaves, the stalk is taken out and cut in half.
Which diagram shows the appearance of the cut end of the stalk?
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The table shows the composition of four samples of air.
[Table_1]
Which sample is inspired air and which sample is expired air?
566
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506
The diagram shows an experiment to investigate the respiration of yeast.
Which gas is evolved and which new compound is present after 24 hours?
587
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530
In which conditions do the leaves of a green plant respire? [Table_1]
535
571
525
Which two substances are both reabsorbed in the kidneys?
506
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511
What are correct descriptions of mitosis and meiosis? [Table_1]
514
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579
The diagram shows two antagonistic muscles and the directions of movement that they produce.
Which row correctly identifies these muscles and the directions of movement they produce on contraction?
584
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591
The diagram shows a germinating broad bean seed which has been cut in half.
Which labels show the cotyledon and the plumule?
509
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506
The diagram shows some changes which take place during a woman's menstrual cycle.
Assuming ovulation occurs on day 14, what is occurring at the time of ovulation?
548
524
575
In addition to a suitable temperature, what else is always necessary for seed germination?
502
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533
A man has three sons.
What is the chance of his next child being a son?
580
518
522
The diagram shows a cross between heterozygous tall pea plants.
Which statement is not correct?
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563
The bar chart shows the heights of pea plants grown from 500 pea seeds.
What variation do the plants show?
598
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592
Which pair of statements about energy flow in ecosystems is correct?
[Table_1]
570
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543
The diagram shows a food chain based on a tree.
Which diagram shows a pyramid of numbers for this food chain?
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521
Which process forms part of the carbon cycle?
593
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578
Herbivores take in carbon atoms from plants. How do carbon atoms leave the herbivores? [Table_1]
516
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513
In which stages in the water cycle is the water in vapour form? [Table_1]
565
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532
The graph shows how the population of the world has increased from 1650 until the present day.
What stage in the sigmoid population growth curve is represented by region P?
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584
Lichens are organisms that do not grow well in air containing sulfur dioxide. Which graph shows the change in number of lichen species from the centre of an industrial city to the countryside 15 km away?
512
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592
Which two gases \textbf{both} contribute to global warming?
545
503
573
