Biology help please -Tissue culture investigation . Really need the help

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JanaALEVEL
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There was a question on the limitations of the procedure used to test this hypothesis ‘The higher the concentration of a plant growth regulator the greater the rate of growth of the plant tissue.’

Here is the mark scheme answer (these are 2 mark schemes for the same question)
https://imgur.com/a/KAn4zjC
I don't understand Mp4 in the MS on the right (I think it's the same as Mp5 on the left-which I also don't understand)
Could someone please explain it to me ? And what is another variable that could be a limiting factor for plant tissue growth that isn't controlled in the investigation ? (Mp4 on the left)


I genuinely need the help, if you can help me, please do
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t
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(Original post by JanaALEVEL)
There was a question on the limitations of the procedure used to test this hypothesis ‘The higher the concentration of a plant growth regulator the greater the rate of growth of the plant tissue.’

Here is the mark scheme answer (these are 2 mark schemes for the same question)
https://imgur.com/a/KAn4zjC
I don't understand Mp4 in the MS on the right (I think it's the same as Mp5 on the left-which I also don't understand)
Could someone please explain it to me ? And what is another variable that could be a limiting factor for plant tissue growth that isn't controlled in the investigation ? (Mp4 on the left)


I genuinely need the help, if you can help me, please do
Hey which exam paper is this? I can try to do the whole paper and then tell you
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JanaALEVEL
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(Original post by t)
Hey which exam paper is this? I can try to do the whole paper and then tell you
The one on the right is Jan 2012 and the one on the left is Jan 2019
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Sara03042002
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from what i understand , in the experiment only one type of plant growth regulator hormone is used (according to the hypothesis stated), so the limitation is different types should be used as they give a coordinated response
plant growth regulators are plant hormones like auxines, cytokins and stuff
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t
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Hey I'm literally so sorry for not getting back to you!! I got really worked up with other stuff I've hardly done any past papers I hope you got an answer to your question? I'll try to do the Jan 2012 soon at least!
(Original post by JanaALEVEL)
The one on the right is Jan 2012 and the one on the left is Jan 2019
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