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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?
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The scientific name for humans is Homo sapiens.
What does Homo refer to?
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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
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Which diagram represents a typical plant cell?
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511
What is not an organ?
557
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502
The diagram shows a plant cell which has lost water to its surroundings by osmosis.
Which part is the partially permeable membrane?
511
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Which identifies the chemical elements found in proteins?
: A table showing the presence or absence of elements: carbon, hydrogen, oxygen, and nitrogen.
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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?
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Where are carbohydrates made in a green leaf?
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The diagram shows part of a leaf as seen in cross section under the microscope. What are the names of regions 1, 2, and 3?
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The roots of plants take up nitrates from the soil. What are the nitrates used to make?
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A child decided to eat only meat, oily fish, cheese and bread, and drink only water. Which nutrient would be in low levels in this diet?
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What functions are carried out by the small intestine? [Table_1]
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The diagram shows part of the human alimentary canal and associated organs. Where does amylase act on food?
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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?
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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: temperature and humidity]
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555
Which process releases water vapour into the atmosphere from the leaves of trees?
568
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Which blood vessel carries blood to the muscle of the heart?
549
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503
Which chamber of the heart receives blood directly from the pulmonary vein?
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The diagram shows human blood cells, as seen under a microscope.
What is the function of cell X?
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The diagram shows the breathing system.
What are the labelled structures?
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532
The equations represent chemical reactions that take place in living organisms.
Which reaction releases the greatest amount of energy?
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Where is urea made and where is it removed? [Table_1]
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572
In reflexes, which term describes light, heat and sound?
570
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562
What is a function of the cornea?
588
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570
The diagram shows seedlings in two experiments on the tropic response of seedlings to gravity and light.
How have the seedlings responded?
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Pollination is the transfer of pollen grains from
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528
The diagrams show four methods of birth control. Which one is placed in the uterus?
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541
Which method of birth control can protect a person from sexually transmitted infections?
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Which combination of chromosomes from egg and sperm cells will produce a boy?
[Table_1]
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A farmer buys a bull with unusual curved horns. He wants to know if the bull is pure-breeding for curved horns. He mates the bull with cows in his herd which are all pure-breeding for straight horns.
Which proportion of calves shows that the bull is pure-breeding for curved horns?
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An insect is usually pale in colour which helps to camouflage it on tree trunks. Occasionally black individuals of this insect occur. If the tree becomes dark in colour due to pollution, then the black individuals become more common. Which process causes this?
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The graph shows how the world population of humans is increasing.
What has contributed to this increase?
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Why is yeast used in bread-making?
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What is an example of genetic engineering?
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The diagram shows the results of a survey on the types of animals found along a stretch of river near to a factory.
Which of the following animals lives in the most polluted water?
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