The diagram shows the bean plant root and the swellings (nodules) on it. A bean plant grows well in nitrogen-poor soil because bacteria living in swellings ...
Question 1 Report
The diagram shows the bean plant root and the swellings (nodules) on it.
A bean plant grows well in nitrogen-poor soil because bacteria living in swellings on its roots supply it with nitrogen compounds. What does the plant provide to these bacteria in return?
Answer Details
This is a mutually beneficial partnership. The nitrogen-fixing bacteria in the root nodules supply the bean plant with nitrogen compounds, and in return the plant supplies the bacteria with carbohydrates (sugars) that it made in photosynthesis, which the bacteria use as an energy source. The plant does not give the bacteria nitrogen gas, nitrates or carbon dioxide; those would not be a food supply. Remember that the plant provides the organic food, made by photosynthesis, that powers the bacteria.
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