In general you need to note the trend of the graph ie is there positive or negative correlation and is this correation strong or weak, does the graph plateau, does the graph stop at any points or is it steep at any points etc then relate that to what the graphs measuring.
If give values you can pinpoint any of significance eg y intercept or graph peak values and give an explanation for them relating it to the graph measures. Eg enzyme activity vs temp graph you would pinpoint the peak value and mention that's the optimum temperature the enzyme is active at.
They might ask you to explain any lags in graphs, like why does the curve not immediately decline in a scenario etc. Or maybe why a curve doesn't immediately shoot up. Possible answers could be that it takes time for a response from whatever is being measured etc
Graphs could range from rate of photosynthesis graphs, enzyme activity graphs rate graphs etc so you can draw up each type and write model descriptions of each with the title at the top graph in the middle and bullet point descriptions and then explanations of what the descriptions mean for the measures tested.
Key words like plateau, optimum, correlation, linear relation etc are important in answers.
You should practise doing graph question from past papers and looking at the mark scheme to see how to answer them.
You can use physics and maths tutor to get the past papers
https://www.physicsandmathstutor.com/past-papers/a-level-biology/
https://www.physicsandmathstutor.com/biology-revision/a-level-aqa/
There's some help on how to interpret different graphs here. They give teachers answers on different graphs.
https://www.ocr.org.uk/subjects/science/maths-for-biology/graphs/ but its not much
If give values you can pinpoint any of significance eg y intercept or graph peak values and give an explanation for them relating it to the graph measures. Eg enzyme activity vs temp graph you would pinpoint the peak value and mention that's the optimum temperature the enzyme is active at.
They might ask you to explain any lags in graphs, like why does the curve not immediately decline in a scenario etc. Or maybe why a curve doesn't immediately shoot up. Possible answers could be that it takes time for a response from whatever is being measured etc
Graphs could range from rate of photosynthesis graphs, enzyme activity graphs rate graphs etc so you can draw up each type and write model descriptions of each with the title at the top graph in the middle and bullet point descriptions and then explanations of what the descriptions mean for the measures tested.
Key words like plateau, optimum, correlation, linear relation etc are important in answers.
You should practise doing graph question from past papers and looking at the mark scheme to see how to answer them.
You can use physics and maths tutor to get the past papers
https://www.physicsandmathstutor.com/past-papers/a-level-biology/
https://www.physicsandmathstutor.com/biology-revision/a-level-aqa/
There's some help on how to interpret different graphs here. They give teachers answers on different graphs.
https://www.ocr.org.uk/subjects/science/maths-for-biology/graphs/ but its not much
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