Confusion about drawing of phloem and xylem (1 Viewer)

[jannny]

Ok, my teacher and the textbook are saying differnt answers.

In the textbook some of them shows that if we're asked to draw a longitudinal section of stem, we should show companion cells in the ploem?

Teachers say that we just show tubes..

Can anyone tell me what should I draw if asked about longitudinal or transverse section of a steam to get full marks

thanks.

 

[beentherdunthat]

You have to draw companion cells in the longitudinal section. Want a demonstration??? Or do you know how to draw it?

 

[jannny]

that's what I did and got 0/3, yes demonstration please, will be really appreciated =]

 

[jannny]

Cool thanks, so If we are asked about drawing longitudinal section of a stem will this be the right order?

Epidermis - Phloem(show companioncell) - Xylem(just tubes) - Xylem(just tubes) - Phloem(show companioncell) - Epidermis

Am i missing something?

 

[beentherdunthat]

DAMNS. THIS POSTING AN IMAGE THING NEVER WORKS.

 

[beentherdunthat]

Here. I drew the longitudinal section of Xylem and Phloem on how I used to draw them. I'll get the transverse ones on later. With the phloem you have to basically repeat the drawing after the companion cells. Or that's about it, whatever you want

 

[ssglain]

You have to draw companion cells in the longitudinal section.

True.

& In addtion to that, phloem tubes would not be able to perform their function without companion cells so they're important enough to have marks attached to them in exam. This is because the energy provided by companion cells to first actively transport sugars from the source into the phloem tubes kicks off the whole pressure flow mechanism for the translocation of sugars. Similarly, at the sink end companion cells provide energy to move sugars out of the phloem tubes.

 

[Buiboi]

YESSSS!! i needed this dotpoint lol
do we have to know abot the symplastic and apoplastic loading?

 

[ssglain]

YESSSS!! i needed this dotpoint lol
do we have to know abot the symplastic and apoplastic loading?

I wouldn't imagine so, but then I wouldn't really know.

 

[ssejamafone]

YESSSS!! i needed this dotpoint lol
do we have to know abot the symplastic and apoplastic loading?

lol. i sure hope we DON't need to know about that, coz we definitely did not learn that in class. >_>"