Edexcel 6BIO2 ~ 3rd June 2013 ~ AS Biology

Original post by Relaxedexams

That is exactly what is in the student book. In a mark scheme and the revision guide, its given the other way round!!

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Which paper and what question?

Reply 162

Should we learn to draw the cell wall structure??

Reply 163

And how do you compare the functions of the xylem and sclerenchyma?

Reply 164

Original post by NilFBosh

Which paper and what question?

Jan 2011 q5 (b) (2)

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Reply 165

Original post by Relaxedexams

Jan 2011 q5 (b) (2)

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Well, the question was how does it contribute to the physical properties of the plant, so u have to talk about the secondary cell wall because it is the "net like " arrangement of the microfibrils which increase the strength of the cell wall.

Remember, as the cell grows a secondary wall will be formed

Reply 166

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Original post by NilFBosh

Well, the question was how does it contribute to the physical properties of the plant, so u have to talk about the secondary cell wall because it is the "net like " arrangement of the microfibrils which increase the strength of the cell wall.

Remember, as the cell grows a secondary wall will be formed

Sorry, the mark sheme does not state which layer has criss cross (right angle ) microfibrils, the revision guide is what is confusing me!

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Reply 167

Original post by Relaxedexams

Sorry, the mark sheme does not state which layer has criss cross (right angle ) microfibrils, the revision guide is what is confusing me!

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Read this article.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2224504/

"In some regions, the wall appears to consist entirely of longitudinal microfibrils so that the rib forms an integral part of the wall."

I'd ask ur teacher if I were u.

Reply 168

Original post by NilFBosh

Read this article.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2224504/

"In some regions, the wall appears to consist entirely of longitudinal microfibrils so that the rib forms an integral part of the wall."

I'd ask ur teacher if I were u.

My teacher says wat is in the student book. The revision guide says otherwise. I did check on the net, but it doesnt address my issue directly, it just complicates things.

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Reply 169

Original post by Relaxedexams

My teacher says wat is in the student book. The revision guide says otherwise. I did check on the net, but it doesnt address my issue directly, it just complicates things.

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Wikipedia states "The organization of microfibrils forming the primary cell wall are rather disorganized"
Better to learn the mark scheme I guess.

Reply 170

QUANTAM

11

Hey can someone post Assassins notes up because they aren't working. Really appreciated!

Reply 171