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What is a characteristic of all living organisms?
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What is the most accurate method of classifying animals?
526
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Scientists discover a new species of animal.
It has a segmented body with two pairs of legs on each segment.
To which group of animals does this new species belong?
564
545
573
In which part of a cell does photosynthesis take place?
544
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548
The diagram shows some of the blood vessels and other structures in the human body.
The blood vessels shown are all parts of the same
582
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517
A photograph shows a plant cell nucleus measuring 2 mm across.
If the magnification of the cell is ×500, what is the actual size of the nucleus?
502
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592
By which process do oxygen and carbon dioxide move between cells and capillaries?
517
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524
Which process is involved in the uptake of glucose by the epithelial cells of kidney tubules?
516
589
535
Which element is found in proteins but not carbohydrates?
505
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550
A DNA sample was tested to identify its bases.
35% of the bases in the DNA were G.
Which row shows the percentages of the other bases?
[Table_1]
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551
Starch is digested by amylase in the mouth, but it is not digested in the stomach.
What is the reason for this?
550
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576
A plant with striped leaves was kept in bright light for six hours.
A leaf was taken from the plant and the chlorophyll was removed. The leaf was then tested for starch using iodine solution.
Which diagram shows the result of the test?
558
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The graph shows daily carbon dioxide uptake and transpiration by the plant \textit{Agave americana}. The plant is adapted to live in very dry conditions.
What can be concluded from this graph?
516
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Statements 1 to 4 describe stages in the development of cholera.
1 Chloride ions are secreted into the gut.
2 Osmosis causes water to move into the gut.
3 The infected person becomes dehydrated.
4 Toxins are produced by the pathogenic bacteria.
What is the correct sequence of the four stages?
555
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539
What is the cause of the \textit{start} of dental decay?
582
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The diagram shows one of the stomata of a leaf, and some of the cells that are near it.
During transpiration, what describes the movement of water at X and at Y?
505
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505
A ring of phloem tissue was removed from the stem of a plant, as shown in the first diagram. Carbon dioxide containing radioactive carbon was supplied to the leaf of the plant. The second diagram shows where radioactive carbon was present after three hours.
Which statements does the experiment support?
1 Translocation of sugar only occurs in one direction.
2 Translocation occurs in the phloem.
3 Translocation requires energy.
593
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570
Through which blood vessels does blood flow into the heart?
1. pulmonary artery
2. pulmonary vein
3. vena cava
4. aorta
594
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A child is vaccinated against measles. After a period of time the child is infected with the measles virus.
The graph shows the concentration of measles antibodies in the child’s bloodstream during this time.
Which statement is consistent with the information in the graph?
524
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577
Which sequence of changes takes place when we breathe in?
593
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543
A student carried out an experiment to investigate the effect of temperature on the volume of urine produced.
Which row shows the experiment where the environmental temperature was increased from 20°C to 40°C but no other changes were made?
[Table_1]
582
531
526
Which row shows the levels of organisation for structures associated with the eye?
[Table_1]
510
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588
Which row correctly compares hormonal control with nervous control?
[Table_1]
582
539
575
Which statement about the regulation of human body temperature is correct?
580
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542
Why are people advised not to drive a car after drinking an excessive quantity of alcohol?
524
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535
What is a disadvantage of asexual reproduction when a new crop disease appears on a farm?
555
581
545
Where is progesterone produced in the late stages of pregnancy?
538
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504
The diagram shows structures involved in the synthesis of an enzyme in a cell.
What is structure 2?
564
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531
Which definition of mitosis is correct?
572
512
531
What is a correct description of a gene mutation?
521
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587
Adaptive features are inherited features that increase fitness.
What is the definition of fitness?
514
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568
The diagram shows energy transfer through a food chain. The labelled arrows represent the energy transfers.
Which energy transfers are shown by the labelled arrows?
589
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The organisms in a food chain can be represented by pyramids of numbers or pyramids of biomass.
Which diagram represents a pyramid of numbers?
509
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Scientists wanted to know which one of four different varieties of bacteria, A, B, C, or D, would be the best to use to make a protein. They grew the bacteria for five days using the same starting mass of each bacterium. They then measured the mass of bacteria and the mass of protein produced per gram of bacteria. The results are shown in the table.
Which variety of bacteria should the scientists choose?
[Table_1: A table showing mass of bacteria at the start, mass of bacteria after five days, mass of protein produced per gram of bacteria for varieties A, B, C, D.]
502
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The graph shows the annual deforestation and annual net release of carbon dioxide from an area of tropical forest between 1990 and 2001.
Which statements are correct?
1. The highest rate of deforestation occurred in 1995.
2. There is a close relationship between annual deforestation and carbon dioxide release.
3. The annual net release of carbon dioxide increases every year.
594
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