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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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What is a correct way of naming a species, according to the binomial system?
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The diagram shows four arthropods.
How many of these arthropods are insects?
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The key can be used to distinguish between four different chemical substances.
Use the key to identify which substance could be a protein.
1 contains the element carbon ................................................ go to 2
does not contain carbon ........................................... A
2 contains the element nitrogen ................................................. B
does not contain nitrogen .......................................... go to 3
3 gives a positive result with Benedict’s test ..................... C
gives a negative result with Benedict’s test ................... D
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The diagram shows two guard cells from a leaf. Which labelled part would also be found in liver cells?
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The diagram shows part of a leaf in cross-section. Structures X and Y are both part of the same
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The diagram shows a plant cell. Which features show that it is a plant cell?
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In a section through a plant, a student found a group of long, microscopic structures. The structures lacked end walls, cytoplasm and nuclei.
Which identification and reason best matches the student’s observations?
[Table_1]
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The diagram shows a specialised cell cut in half.
What does this diagram indicate about the structure of this cell?
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How do carbon dioxide and oxygen move in and out of a mesophyll cell?
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During osmosis, which molecules move and through which type of membrane? [Table_1]
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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?
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Which effect does a gradual decrease in pH from 13 to 1 have on the action of amylase?
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The diagram represents a protein molecule. What do the small circles represent?
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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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Which components make up most of the dry mass of a balanced diet?
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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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The diagrams show four different stages in one heartbeat.
What is the correct order for the stages after stage P?
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Which process in humans does not use energy released from respiration?
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The graph shows the results of an experiment to investigate the rate of respiration of an organism at different temperatures.
What explains the difference between the rate of respiration at 50°C and that at 30°C?
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The diagram shows an experiment to investigate the respiration of yeast.
Which gas is evolved and which new compound is present after 24 hours?
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Which function does not occur in the kidneys?
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Which labelled part of the eye contains muscle?
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Which method of birth control is based on knowing the stage of a woman’s menstrual cycle?
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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?
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In addition to a suitable temperature, what else is always necessary for seed germination?
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A genetic cross between two organisms may be shown as Gg \times Gg. What does g represent?
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Some fruit flies have orange eyes and others have red eyes.
If two orange-eyed fruit flies are crossed, their offspring always have orange eyes.
If two red-eyed fruit flies are crossed, their offspring sometimes include both orange-eyed and red-eyed flies.
What can be concluded from these observations?
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What can be continuously recycled in ecosystems?
[Table_1]
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Which diagram shows a pyramid of biomass for a woodland?
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Which of the following is an example of a food chain?
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The diagram shows the movements of water between oceans, land and the air. The figures are based on an annual mean precipitation of 100 units. What is the total of evaporation from the land and transpiration from plants at X?
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What is shown in the diagram?
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The table shows the birth rates and death rates in four countries. Which country will double its population most quickly?
[Table_1]
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Which two gases both contribute to global warming?
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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?
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