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An *Amoeba* is a single-celled organism.
The diagram shows an *Amoeba* engulfing a food particle.
Which characteristics of living organisms are shown?
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The binomial names for five different species are listed.
1. _Calluna vulgaris_
2. _Garra rufa_
3. _Primula veris_
4. _Primula vulgaris_
5. _Vespula rufa_
Which species belong to the same genus?
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580
The diagram shows an animal.
What is the animal?
1 animal with a vertebral column ....................................... vertebrate
animal with an exoskeleton ....................................... go to 2
2 no distinct head, thorax and abdomen ....................... A
distinct head, thorax and abdomen ....................... go to 3
3 eye occupies less than one third of the head ................. B
eye occupies more than one third of the head ................. go to 4
4 wings are wider than they are long .................................... C
wings are longer than they are wide .................................... D
535
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The diagram shows two guard cells. Which label is correct?
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The diagram shows some cells. Where are these cells found?
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A student draws a root hair cell. The actual length of the cell is 0.8 mm and the drawing of the cell is 80 mm long.
What is the magnification of the student’s drawing?
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In which diagram would oxygen diffuse into the cell?
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Which statement about the role of the pressure of water in supporting plants is correct?
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In a photosynthesis experiment, a plant is left in bright sunlight for several hours. A leaf is then removed from the plant and tested for starch, using iodine solution.
The diagram shows the leaf from the plant that was used in the experiment.
Which diagram shows the result of the experiment?
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An experiment was carried out to investigate the effect of pH on enzyme action. The graph shows the results.
What are the labels for the x-axis and the y-axis?
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Four test-tubes were set up as shown in the diagram. In which test-tube is the starch digested most quickly?
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The diagram shows a section through a leaf.
What are structures K, L, M and N?
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Which element is present in all amino acids?
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A deficiency of which nutrient can cause scurvy?
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531
The diagram shows a large food molecule changing into smaller molecules.
What is process X?
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Which part of the alimentary canal produces an enzyme that digests proteins?
587
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540
By which method is water absorbed by root hair cells?
572
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Which graph shows the effect of increasing humidity on the rate of transpiration?
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572
The diagram shows a section through a mammalian heart. Which part carries blood directly from the lungs? [Image]
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The diagram shows the external structure of the human heart. Which label identifies a coronary artery?
504
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Some features that help to defend the body against pathogens are listed.
1. mucus
2. skin
3. stomach acid
4. phagocytosis
Which features can prevent pathogens entering body tissues?
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The diagram shows an alveolus.
Which gas is represented by the pathway shown by arrow X?
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The table shows some facts about aerobic respiration.
Which row is correct?
[Table_1]
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Which word equation represents anaerobic respiration in yeast cells?
520
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The diagram shows part of the excretory system of a female mammal.
What is tube X?
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Which part of the eye changes in size in response to changes in light intensity?
539
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A scientist investigated how the human body reacts to temperature.
Which row shows the expected responses when the environmental temperatures are 0°C and 40°C?
[Table_1]
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574
A seed is placed and grown on a rotating disc, as shown. Which diagram shows the appearance of the seedling shoot after seven days?
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541
Which statement describes a structural adaptation of wind-pollinated flowers?
581
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What is the correct order of structures through which human sperm must pass in order to fertilise an egg cell?
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Which pair of birth control methods are chemical methods of preventing pregnancy?
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Which process occurs in asexual reproduction?
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A condition called polydactyly gives a person extra fingers or toes. One type of polydactyly is caused by a dominant allele.
A man who is homozygous recessive for the condition marries a woman who is heterozygous for the condition.
What is the probability that their first child will have polydactyly?
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572
A species of insect usually has pale-coloured wings. This helps to camouflage them on pale-coloured tree trunks. A few of the insects in this species have darker coloured wings.
After a number of years the tree trunks become darker in colour due to environmental changes. The insects with dark-coloured wings become more common than insects with pale-coloured wings in this species.
Which process causes this change in the proportion of insects with dark-coloured wings?
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What is the initial source of energy input into most biological systems?
531
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Which combination of factors would cause the greatest reduction in the population growth of an animal species?
[Table_1]
570
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554
Which process releases carbon dioxide into the atmosphere?
534
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Three statements about the bacteria that are used in biotechnology and genetic engineering are listed.
1. They can convert simple molecules into more complex ones.
2. They can only reproduce very slowly.
3. Their genetic material can be changed.
Which statements are correct?
570
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559
What is meant by a sustainable resource?
589
532
520
