Freddie1M
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#1
Report Thread starter 6 years ago
#1
This is the question:


2 (c) Other scientists showed that plants grown in an increased concentration of carbondioxide have a higher carbon : nitrogen ratio than plants grown in atmospheric carbondioxide concentration. What does this suggest about the protein concentration in theplants grown in the increased concentration of carbon dioxide? Explain your answer.

The only information we have been given is that the mean mass of caterpillars is greater at atmospheric conc. of CO2 rather than increased conc. of CO2.

Here are the links to the papers and mark schemes if you want a better idea:
http://filestore.aqa.org.uk/subjects...W-QP-JAN10.PDF
http://filestore.aqa.org.uk/subjects...W-MS-JAN10.PDF



I don't understand why C02 conc. will have an effect on protein conc., surely the ratio changes only due to the fact that the plant has more Carbon because of more C02, rather than less nitrogen (protein is made up of nitrogen.) Can someone explain the answers in the mark scheme please. Does increase Conc of CO2 reduce amount of nitrogen in plants? If so, why?
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