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What is a description of excretion?
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527
555
The scientific name for a domestic horse is $Equus\ caballus$.
Which row shows the two parts of the name using the binomial system?
[Table_1]
| | *Equus* | *caballus* |
|---|---|---|
|A|kingdom|species|
|B|species|genus|
|C|genus|kingdom|
|D|genus|species|
576
541
500
The diagram shows a type of plant cell.
Where does this type of cell come from?
510
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538
What is the formula for calculating magnification?
504
569
573
The diagram represents a substance moving across a cell membrane, using energy from respiration.
Which method of transport does the diagram represent?
514
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542
Which food-testing reagent shows a positive result when it turns from blue to purple?
544
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550
What are the characteristics of an enzyme?
[Table_1]
548
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An enzyme in potato cells causes oxygen to be produced from the breakdown of hydrogen peroxide.
Cubes of potato tissue were placed in a hydrogen peroxide solution at different temperatures.
The number of bubbles of oxygen released per minute was 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?
537
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585
Which molecules contain nitrogen?
510
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519
The photomicrograph shows the lower surface of a leaf.
Which part of the leaf is labelled X?
504
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500
Which row shows the correct enzyme, its substrate and the site of enzyme action in the alimentary canal?
[Table_1]
580
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569
A student set up the experiment shown in the diagram on a hot and dry day. The air bubble moved towards the leafy shoot by 30 mm in 1 hour.
The student was asked to predict and explain the result that would have been obtained on a hot and humid day.
Which row is correct?
[Table_1]
563
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563
Which statement describes the process of translocation?
533
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507
The diagram shows the human heart.
What are the semilunar valves?
513
563
551
Which component of the blood transports hormones?
569
569
590
During the process of vaccination, what stimulates an immune response?
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569
Muscles are responsible for the ventilation of the lungs during breathing.
Which row describes their action during the inspiration of air?
[Table_1]
505
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542
Which molecule is a product of anaerobic respiration in yeast?
563
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In a kidney nephron, which substances are filtered out of the blood in the glomerulus?
517
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528
How many types of cone cells are there in the human eye?
580
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568
The diagram shows a plant shoot growing towards the light.
Which row describes where auxin is produced, and which side of the shoot has the lowest concentration of auxin?
557
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526
Which statement about antibiotics is correct?
500
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516
The diagram shows a strawberry plant.
Which labelled part of the plant can only be produced by asexual reproduction?
597
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548
Which part of a flower can contain a pollen tube?
598
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519
To avoid extinction of rare plant species, a botanical garden keeps a collection of seeds known as a seed bank.
Which condition will prevent these seeds germinating while they are in storage?
522
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566
The graph shows the changes to the thickness of the lining of the uterus during the menstrual cycle.
Which hormone is responsible for the change to the thickness of the lining of the uterus shown between days 5 and 16?
517
583
564
Which hormone concentrations are high during pregnancy?
[Table_1]
511
531
522
By which route would an HIV infection \textbf{not} be transmissible?
572
526
559
Which description of a human gamete is correct?
590
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566
Which statements about meiosis are correct?
[Table_1]
507
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584
A female parent who is heterozygous for red-green colour blindness has a female child with a red-green colour-blind male parent.
What is the chance of the female child being colour-blind?
568
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508
A pure-breeding plant with smooth stems was crossed with a heterozygous plant with hairy stems.
What will be the ratio of hairy to smooth stems in the resulting plants?
507
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534
Which row shows the adaptive features of a xerophyte?
[Table_1]
563
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503
The diagram shows a marine food web.
At which trophic levels is the cod found?
575
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The diagram shows part of the carbon cycle.
Which labelled arrow would have the balanced chemical equation:
$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2$?
574
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Which statement explains why there is a lag phase in a population graph?
504
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534
The flow chart describes the process of eutrophication.
step X
$\downarrow$
increased growth of producers
$\downarrow$
increased decomposition after death of producers
$\downarrow$
step Y
$\downarrow$
death of organisms in water
What should be at step X and step Y in the flow chart?
[Table_1]
576
505
513
How can fish stocks be conserved?
544
540
513
Penicillin is produced in a fermenter by growing the fungus $Penicillium$. The graph shows how the mass of living $Penicillium$ fungus and the concentration of penicillin change over time.
When is the best time to collect the penicillin?
546
593
504
Which enzymes are required to produce human proteins, using genetic modification?
[Table_1]
564
573
539
