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Scientific diagrams

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sidzeman:
ahhhh I see thank you
Also, did you guys learn the functions of all these structures or just how to draw them - it doesn't really specify in the dotpoint

pikachu975:

--- Quote from: sidzeman on August 13, 2017, 04:45:10 pm ---ahhhh I see thank you
Also, did you guys learn the functions of all these structures or just how to draw them - it doesn't really specify in the dotpoint

--- End quote ---

Yes. You know the function of xylem and phloem already from another dot point. Companion cells have a nucleus and I guess supply the energy for the phloem so that translocation can be carried out.

sidzeman:
Sorry so what are the structures again?
Phloem is composed of living sieve cells which are joined end to end, with perforations to allow the movement of sap

What is xylem composed of and what is the purpose of sieve plates in phloem

angelahchan:

--- Quote from: sidzeman on August 13, 2017, 09:48:23 pm ---Sorry so what are the structures again?
Phloem is composed of living sieve cells which are joined end to end, with perforations to allow the movement of sap

What is xylem composed of and what is the purpose of sieve plates in phloem

--- End quote ---

This is pretty late, but xylem is composed of two  tissues: xylem vessels (the wood of the stem) and tracheids. Xylem are dead, hollow tubes strengthened by lignin which provides support.
I'm not sure you need to know the function of sieve plates, since it wasn't in my notes, but I googled it anyway. Apparently the pores in the sieve plates can block phloem sap from flowing out when the phloem cell is damaged, protecting the phloem sap from intruding animals. (I'm assuming they close off but idk)

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