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Figure 7 shows the time taken for blood to clot at different temperatures - Edexcel - GCSE Biology Combined Science - Question 4 - 2020 - Paper 1
Question 4
Figure 7 shows the time taken for blood to clot at different temperatures. temperature in °C time taken for blood to clot in seconds 5 90 15 70 25 55 35 40 45 110 ... show full transcript
Worked Solution & Example Answer:Figure 7 shows the time taken for blood to clot at different temperatures - Edexcel - GCSE Biology Combined Science - Question 4 - 2020 - Paper 1
Step 1
Draw a graph to show the data in Figure 7.
Answer
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Set up the axes: On the horizontal axis (x-axis), label the temperature in °C, ranging from 0 to 50. On the vertical axis (y-axis), label the time taken for blood to clot in seconds, ranging from 0 to 120.
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Create a linear scale: Ensure both axes are evenly scaled, for example, using increments of 5 units for temperature and 10 units for time.
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Plot the points: Mark the following coordinates on the graph based on the data in Figure 7:
- (5, 90)
- (15, 70)
- (25, 55)
- (35, 40)
- (45, 110)
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Connect the points: Carefully draw a line connecting these points to represent the relationship between temperature and clotting time, ensuring the graph is clear and readable.
Step 2
Step 4
Step 5
Explain how one structure of a vein helps the blood return to the heart.
Answer
One structure of a vein that helps blood return to the heart is the presence of valves. These valves prevent backflow of blood, ensuring that it moves in the correct direction towards the heart, especially in areas where the blood flow may be against gravity.