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Which characteristic of living organisms is responsible for the production of oxygen in the leaf of a plant exposed to sunlight?
590
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The scientific name for humans is _Homo sapiens_.
What does _Homo_ refer to?
548
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The diagram shows an insect.
Use the key to identify the insect.
1 wings present ............................................ go to 2
wings absent .............................................. A
2 two pairs of wings .................................... go to 3
one pair of wings ...................................... B
3 wings with circular markings .................... C
wings without circular markings ................. D
506
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596
Which diagram represents a typical plant cell?
569
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534
A student draws a diagram of a mitochondrion.
The diagram has a magnification of ×20,000.
The diagram is 5 cm long.
What is the actual size of the mitochondrion?
573
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555
The diagram shows a plant cell which has lost water to its surroundings by osmosis.
Which part is the partially permeable membrane?
594
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557
What would lead to a decrease in diffusion rate into a cell?
524
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The graph shows the effect of temperature on an enzyme-controlled reaction. Which statement describes the effect of temperature on this reaction?
572
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Curve X on the graph shows the effect of light intensity on the rate of photosynthesis.
How have the conditions changed to produce curve Y?
599
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575
An experiment is set up to investigate gas exchange in aquatic plants. The hydrogencarbonate indicator solution is orange at the start. Which colour is it after three hours?
501
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583
The roots of plants take up nitrates from the soil.
What are the nitrates used to make?
546
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What is the main cause of kwashiorkor?
[Table_1]
561
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528
What functions are carried out by the small intestine?
[Table_1: absorption of digested food, absorption of water, ingestion]
561
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570
The graph shows the effect of pH on the activity of a human digestive enzyme.
What is the enzyme?
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The diagram shows the stem of a plant. A strip of the outer tissue including the phloem has been removed.
How is transport in the plant affected?
549
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599
A plant shoot is placed in a solution of a dye.
The dye moves up the stem.
Under which conditions will the dye move slowest?
[Table_1]
541
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565
Which substance is moved by translocation in a flowering plant?
583
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The diagram shows a section through the heart.
Which is an atrioventricular valve in the right side of the heart?
528
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562
What is a correct function of the lymphatic system?
505
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560
The diagram shows human blood cells, as seen under a microscope. What is the function of cell X?
576
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543
Which change occurs during blood clotting?
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How does passive immunity differ from active immunity? In passive immunity
599
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After a race, athletes experience oxygen debt. The diagram shows how the oxygen debt is removed. What happens at X?
597
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What is the equation for anaerobic respiration in yeast?
597
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597
In a kidney tubule, which substances are filtered out of the blood in the glomerulus?
570
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553
When the blood glucose concentration is low, which hormone is released and which organ releases it? [Table_1]
521
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568
The diagram shows seedlings in two experiments on the tropic response of seedlings to gravity and light. How have the seedlings responded?
584
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503
What describes the nuclei in human reproduction?
[Table_1]
555
502
503
Which feature allows the sperm to dissolve the jelly coating of the egg cell?
588
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The graph shows a hormone that is involved in controlling the human female menstrual cycle.
Which hormone is shown by the curve?
515
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Which combination of chromosomes from egg and sperm cells will produce a boy?
[Table_1]
507
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530
What is the inheritance of colour blindness an example of?
566
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Which is an adaptive feature of hydrophytes?
580
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592
Which structures, found in bacteria, make them useful in genetic engineering?
521
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Why is yeast used in bread-making?
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580
An advantage of some genetically modified crop plants is that they will not
543
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When raw sewage is discharged into a stream, what is a result of eutrophication?
561
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538
