13+ Science ISEB
1. Underline the option which best completes each of the following.
(a) the Sun
(b) a producer and one or more consumers
(c) C
(d) a fuse
(e) A has a higher frequency than B
(f) CuSO4
(g) solute
(h) discontinuous variation
(i) renewable resource
(j) carbon
10 marks
2. (a) (i) On the same graph, plot the data in the table for the solubility of potassium nitrate.
points correctly plotted
4 marks
0.5 mark for each point
2. (a) (i) On the same graph, plot the data in the table for the solubility of potassium nitrate.
1 mark
(b) Using your graph
accept answers 23–27 °C
1 marks
(i) state the temperature at which the solubilities of sodium chloride and potassium nitrate are the same. 25 °C
(ii) underline the words in the boxes to complete the sentence below describing how the solubility of sodium chloride changes with temperature. rises slowly
2 marks
(iii) Underline the words in the boxes to complete the sentence below which describes how the solubility of potassium nitrate changes with temperature. rises rapidly
1 mark
(c) State the name given to a solution which has the maximum amount of a salt dissolved in it. saturated
1 marks
3. The diagram below shows the lungs. The lung surface is greatly folded, has very thin walls and has an extensive blood supply.
(a) (i) Suggest why the lung surface is greatly folded.
It creates an increased surface area
(ii) Suggest why the walls of the lung are very thin.
To facilitate diffusion of gases
(iii) Suggest why the lungs have an extensive blood supply.
To carry gases to and from lungs
1 mark
accept valid alternatives
1 mark
1 mark
(b) To which organ does the blood flow after it has passed through the lungs?
The heart
1 mark
(c) Suggest why a person having an asthma attack finds it difficult to breathe.
Airways narrow/become blocked, reducing airflow to the lungs
or words to this effect
2 marks
(d) Suggest why the inhaler will make breathing easier.
Widens airways, it enlarges the airflow to the lungs
2 marks
or words to this effect
(e) Explain how smoking can cause breathing difficulties.
Tar covers lung walls/airways and there is less surface area for gas exchange
2 marks
accept valid alternatives
5(a) (i) Why is red cabbage water a good indicator for distinguishing between a very acidic solution and a very alkaline solution? Different colours easily distinguish acid and alkaline solutions
(ii) Why is red cabbage water less useful for distinguishing between a neutral and a weakly-acidic or a weakly-alkaline solution? Can be difficult to identify the difference in the colours pink and purple
(b) Which three other indicators are good for identifying an alkaline solution? red onion water, turmeric water, red litmus
(c) Explain how you could use the litmus paper to identify a neutral solution. Both blue and pink litmus paper show no colour change in a neutral solution
(d) Complete the table below to show whether a substance is acid, alkaline or neutral.
pH acid, neutral or alkaline?
less than 7 = acid
7 = neutral
more than 7 = alkaline
2 marks
2 marks
3 marks
2 marks
1 marks
5(a) Complete the boxes with suitable questions to identify the vertebrate groups shown by the drawings. Suitable questions in boxes requiring yes/no answer
(b) Can the key above be used to identify to which group this animal belongs? Explain your answer. Answer depending on questions in part (a)
3 marks
2 marks
(c) (i) Suggest a reason why skin-covering is useful in identifying vertebrate groups. Each vertebrate group has a different skin-covering. Skin-covering is a diagnostic feature in vertebrates
(ii) Complete the table below showing how skin-covering can be used to identify the vertebrate groups.
Amphibians = moist and no scales
birds = feathers
fish = wet scales
mammals = fur/hair
reptiles = dry scales
3 marks
0.5 mark for each
(d) Suggest why the scientists thought this was a joke. Has the features both of a bird and a mammal
2 marks
6. (a) Add the label P to the diagram to show where on Earth you would observe a partial eclipse. Letter P anywhere in light grey zone on surface of the Earth
(b) Suggest two things you would notice if you were outside during a total eclipse on a cloudy day. Increased darkness, drop in temperature, change in wind direction
(c) Suggest why people use a pinhole viewer to see an eclipse. To prevent eye damage.
(d) Draw the image of the eclipse on the screen in the diagram.
1 mark
2 marks
Any 2 sensible suggestions
1 mark
2 marks
1 mark for the shape
1 mark for orientation
(e) Tick boxes in the table below to indicate whether the objects shown in the diagram are opaque or luminous.
3 marks
(f) Using the formula distance 5 speed 3 time, calculate how far the Moon has travelled during the eclipse.
Show your working.
2 marks
3 700 3 4 5 14 800 km
7. (a) What do you understand by the term fair test ?
Test only one variable at a time
All other variables are kept the same
2 marks
(b) Complete the planning document below to ensure that the investigation is fair.
5 marks
accept valid alternatives
(c) Why is this a good idea? To ensure that results are reliable
1 mark
8. (a) By ticking the appropriate box, state whether the forces in the following situations are balanced or unbalanced.
6 marks
(b) Add arrows to the diagram below to show the forces acting on the table. Downward force arrow longer than upward force arrow
2 marks