hespongymesophyllcontainslotsofairspacesandalargesurfaceareaforgasexchange
helowerepidermiscontains guardcellswhichopenandclosestomata to preventwaterloss
Stomata are gaps inthe lowerepidermis whichallowgasexchange
, ranslocation
Phloemtubestransportfood
d
Made
of columnsofelongatedlivingcellswithsmallpores in theendwalls to
ÉPÉE
Wow a sap to flowthrough
ygg.gg
heytransportfoodsubstances mainly dissolvedsugars made inthe leaves
to therestoftheplantforimmediateuse orforstorage
The transport directions This process is calledtranslocation
goes inboth
Xylemtubes takewaterup
Made deadcellsJoinedend to endwith noendwallsand aholedown
y of
themiddle They'restrengthened withlignin
They carry waterandmineral ions fromtheroots to thestem and
leaves
Themovementof waterfromtheroots through thexylemand out of theleaves is called
the transpiration stream
ranspirationisthe
loss ofwaterfromtheplant
1 Transpiration iscausedbyevaporation anddiffusion
Itamar 2 This evaporationcreates a slightshortage of
i
water in theleaf so morewater is drown up
fromtherestoftheplantthroughthexylemvessies
This meansmorewater isdrawn
upfrom theroots
and so there's a constanttranspiration stream of
water
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller allegra1010. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £5.94. You're not tied to anything after your purchase.
