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The graph shows the body temperature of two animals at different external temperatures - Edexcel - GCSE Biology - Question 6 - 2018 - Paper 1
Question 6
The graph shows the body temperature of two animals at different external temperatures. (i) Calculate the difference in body temperature of these two animals when t... show full transcript
Worked Solution & Example Answer:The graph shows the body temperature of two animals at different external temperatures - Edexcel - GCSE Biology - Question 6 - 2018 - Paper 1
Step 1
Calculate the difference in body temperature of these two animals when the external temperature is 25°C.
Answer
To find the body temperature of each animal at an external temperature of 25°C, we need to refer to the graph:
- For the fish, the body temperature at 25°C is 25°C.
- For the mammal, the body temperature at 25°C is 39°C.
Now, calculate the difference between the two:
Difference = Body temperature of mammal - Body temperature of fish = 39°C - 25°C = 14°C.
Step 2
Explain the relationship between the body temperature of the fish and the external temperature.
Answer
The fish is poikilothermic, meaning its body temperature varies with the external temperature. As the external temperature increases, the body temperature of the fish also increases. This relationship indicates that the fish's body does not maintain a constant temperature but instead reflects changes in the environment.