Cherrygrape1234
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Hi
Please could someone explain limiting factors graphs to me for biology related to photosynthesis. Currently, I am doing my GCSEs but I don’t get the idea how u can tell how something is the limiting factor! Many thanks
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Waterlife
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(Original post by Cherrygrape1234)
Hi
Please could someone explain limiting factors graphs to me for biology related to photosynthesis. Currently, I am doing my GCSEs but I don’t get the idea how u can tell how something is the limiting factor! Many thanks
Hi,

So what you need to think about is the x and y axis. Usually on the y axis it will be rate of photosynthesis and let us say the x axis is light intensity. First the graph will have a linear relationship (ie light intensity will be directly proportional to rate of photosynthesis ). Once the curve starts to level off (i.e plateau) this means the rate is constant. In this section another factor such as Carbon Dioxide is limiting any further increase so the rate becomes constant.

Does that make sense?
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Cherrygrape1234
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(Original post by Waterlife)
Hi,

So what you need to think about is the x and y axis. Usually on the y axis it will be rate of photosynthesis and let us say the x axis is light intensity. First the graph will have a linear relationship (ie light intensity will be directly proportional to rate of photosynthesis ). Once the curve starts to level off (i.e plateau) this means the rate is constant. In this section another factor such as Carbon Dioxide is limiting any further increase so the rate becomes constant.

Does that make sense?
It makes sense up until this part: this means the rate is constant. In this section another factor such as Carbon Dioxide is limiting any further increase so the rate becomes constant. I dont get how something else suddenly becomes the limiting factor surely if the graph becomes constant the light intensity is constant? Please explain!!
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Waterlife
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(Original post by Cherrygrape1234)
It makes sense up until this part: this means the rate is constant. In this section another factor such as Carbon Dioxide is limiting any further increase so the rate becomes constant. I dont get how something else suddenly becomes the limiting factor surely if the graph becomes constant the light intensity is constant? Please explain!!
The light intensity is constant but a factor is preventing light intensity to increase with rate of photosynthesis. Think of it as a road block so cars can't get past and hence you would need to remove the road blocks so cars can get past. At GCSE it would be sufficient to say ' light intensity levels off and hence something else is the limiting factor' and that would give you the marks. At GCSE I found this quite confusing too however quoting what I have said should always give you the mark in exams.
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Cherrygrape1234
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(Original post by Waterlife)
The light intensity is constant but a factor is preventing light intensity to increase with rate of photosynthesis. Think of it as a road block so cars can't get past and hence you would need to remove the road blocks so cars can get past. At GCSE it would be sufficient to say ' light intensity levels off and hence something else is the limiting factor' and that would give you the marks. At GCSE I found this quite confusing too however quoting what I have said should always give you the mark in exams.
Omg this makes sooo much sense now I don’t know how I didn’t get it before! Thank you soooo much
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