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Help! IA Bio question needed!

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Hello, I have been unable to come up with an IB bio question for my IA. I had submitted the ones below but my teacher said I decided to add more complexity, however, we have only studies unit 1 and 2 and I don't have a great understanding of what we have learned in class so far. 

How does light intensity affect the rate of photosynthesis of plants?

Or

How does the light intensity affect the rate of water uptake (transpiration) in plants?

Or

How does temperature affect the activity of enzyme amylase (on starch)?

 

I have also been considering the following question, however, I am unsure if it is good and easily testable: 

How does increasing the duration of Ultraviolet light irradiation affect the production of glucose in plants?

Recommendations? Can you recommend a good but easy IA question?

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