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Why does the energy needed by a human increase during the first ten years of life?
Which features do animal cells share with plant cells? [Table_1]
Which feature is characteristic of both annelids and arthropods?
The diagram shows an animal.
Use the key to identify the animal.
1 wings present ........................... go to 2
wings absent ........................... go to 3
2 one pair of wings visible ............. A
two pairs of wings visible ............. B
3 three pairs of legs .................... C
four pairs of legs ....................... D
The diagram shows a cell.
Which structure is not present?
Which pair of statements about a plant cell is correct? [Table_1]
The diagram shows a cell.
Which type of cell does the diagram show?
The diagram shows a section through a root.
What are the levels of organisation of the labelled structures?
[Table_1]
Two identical cylinders, 40 mm long, are cut from a potato. One (W) is placed in water and the other (X) is placed in a concentrated sugar solution.
What are the lengths of the cylinders after two hours?
[Table_1]
Which structures contain a cell nucleus?
[Table_1]
What is a characteristic of all catalysts?
The bar chart shows the average number of chloroplasts in each of three different types of leaf cell.
What are the three types of cell?
Which blood vessel contains valves?
The diagram shows two food tests carried out on solution X.
Which nutrients are present in solution X?
A person has their gall bladder removed.
Which statement is correct?
The graph shows the energy released by two animals through respiration as the external temperature changes.

Which conclusion can be drawn from the graph?
When blood is flowing through a vena cava, which main blood vessel will it flow through next?
How does insulin move from the pancreas, where it is produced, to the cell where it acts?
The graph shows changes in the volume of air in the lungs of a person at rest, over a period of 30 seconds.
[Image_1: Graph showing volume of air in lungs at rest]
Which graph shows changes in the volume of air in the lungs of the same person immediately after they have done five minutes of vigorous exercise?
Which organs remove excretory products from the blood?
The diagram shows a simple reflex arc.
What is the correct order of events after the knee is tapped?
Four word equations are shown.
P carbon dioxide + water \( \rightarrow \) glucose + oxygen
Q glucose + oxygen \( \rightarrow \) carbon dioxide + water
R glucose \( \rightarrow \) lactic acid
S glucose \( \rightarrow \) alcohol + carbon dioxide
What are the equations for anaerobic respiration in humans and anaerobic respiration in yeast?
The diagram shows different parts of the female reproductive organs where different methods of birth control can be used.
Where should a diaphragm be placed before intercourse if a couple do not want a baby?
The graph shows the effect of an antibiotic treatment on bacterial populations in the blood. What conclusion can be drawn from the graph?
What are involved in reproduction in both animals and plants?
The diagram shows an experiment on germination. Groups of test-tubes were set up as shown. The groups were placed in different conditions.
[Image_1: Diagram of test tubes with seeds]
Which table shows the results?
Key:
✓ = seeds germinate
✗ = seeds do not germinate
The graph shows the masses of two different types of tomato.
What can be concluded from the graph?
In arthropods, growth occurs only after the exoskeleton is shed and before the new one hardens.
Which graph shows a typical growth curve for an arthropod?
The diagram shows a food chain.
If the carnivores in trophic level 3 suddenly die out as a result of disease, in which trophic levels will the number of organisms be likely to decrease?
Genetics is the study of
What is \textit{unlikely} to be affected by the environment?
The diagram shows what happens to the energy that enters the atmosphere from the Sun. How much of the Sun’s energy is not used for photosynthesis?
What are products of respiration in green plants?
The surface waters of the ocean contain a population of microscopic plants.
Which factor would result in fewer of these plants?
By which process does water enter the atmosphere?
The diagram shows part of the carbon cycle.
Which labelled arrow represents photosynthesis?
What is reduced when untreated sewage is released into rivers?
In 2005, fifteen mice were set free on an island where mice had never lived before. The table shows how their population changed over the next three years.
[Table_1]
What caused the population change shown in the table?
The diagram shows a food chain.
A farmer sprays his cabbages with pesticide.
Which organisms does the farmer want to kill?
Which pollutants of water can lead to eutrophication?
[Table_1]