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The diagram shows what happened in an experiment with plant seedlings.
Which characteristic of living things made the seedlings grow towards the light?
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A rat has the scientific name Rattus rattus. What do the two parts of this name refer to?
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Explorers have found an unknown animal living in a rainforest. The animal
• lives on land but has also been seen in water
• lays soft-shelled eggs on land
• does not have gills
• has scaly skin
• is 1.0 m long
• does not produce milk.
To which group is the animal most likely to belong?
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Onion plant cells swell but do not burst when placed in distilled water.
Which cell component prevents the onion plant cells from bursting?
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The diagram shows part of the human body.
Which level of organisation does this diagram show?
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Which diagram shows the appearance of a plant cell several minutes after it has been placed in a concentrated solution of sugar?
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Which statement about active transport is correct?
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Which food-testing solution shows a positive result when it turns from blue to purple?
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Which statement about enzyme-controlled reactions is correct?
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Which substance found in a healthy diet helps to prevent constipation?
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The table shows the percentage of the daily recommended intake of nutrients in a serving of four foods.
Which food would be the best choice to prevent scurvy?
[Table_1]
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After passing through the root hair cells of a plant, what is the next tissue through which water passes?
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From which part of a leaf does most water evaporate during transpiration?
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Which blood vessel carries blood to the muscle of the heart?
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The diagram shows some veins in the human arm and the valves that they contain.
If blood is squeezed out of section X–Y, where should pressure be placed on a vein to stop blood flowing into this section again?
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What is a chemical barrier to pathogens?
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The diagram shows an alveolus and capillary in a human lung.
Which row shows the correct gas and concentrations for diffusion from X to Y in normal conditions?
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In which conditions do the leaves of a green plant photosynthesise?
[Table_1]
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In which conditions do the leaves of a green plant photosynthesise?
[Table_1]
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The diagram represents the flow of blood from the heart, through the liver and towards the kidneys. Where is urea made?
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When a man steps on a sharp object he moves his foot away very quickly.
In which part of his body are the effector cells involved in this action?
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Which row matches structures in the eye with their functions?
[Table_1]
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Which organ produces oestrogen?
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What is meant by the term phototropism?
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Drugs are substances that are taken into the body. Which statement also applies to the definition of a drug?
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The diagrams show pollen grains from three different species of plant as they appear under the microscope. The diagrams are all to the same scale.
Which pollen grains are most likely to be carried by the wind?
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The diagram shows the human female reproductive system. In which structure does fertilisation occur?
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Which disease is an example of an STI?
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Fur colour in cats is an observable feature. Which word is used to describe an observable feature?
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Which row shows the sex chromosomes in the body cells and in the gametes of a woman?
[Table_1]
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In mice, the allele for black hair is dominant to the allele for brown hair.
What proportion of offspring will have brown hair if a cross is made between a homozygous black mouse and a heterozygous black mouse?
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The graph shows the masses of two different types of tomato. What can be concluded from the graph?
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The diagram shows part of the carbon cycle.
What do X and Y represent?
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The diagram shows a food chain in a rock pool.
$$\text{seaweed} \rightarrow \text{whelks} \rightarrow \text{crabs} \rightarrow \text{seagulls}$$
What will happen if the number of secondary consumers increases?
There will be
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What is the role of anaerobic respiration in bread-making?
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A crop plant has been genetically modified to make it resistant to herbicides. Which is a possible disadvantage of introducing this new crop plant?
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Chickens are birds that are farmed to produce eggs for human consumption. A type of chicken has been bred to lay more eggs. Which method would be used to produce this type of chicken?
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Sewage treatment involves a number of stages. Three of the stages are listed.
1. filter beds with anaerobic microbes to digest sewage
2. screens to trap large objects
3. settlement tanks to let insoluble particles sink
What is the correct order for treating sewage?
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