100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
Summary WJEC (England) Eduqas A-Level Biology 3. Requirements for life - 1. Plant Gas Exchange CA$5.57   Add to cart
Quickly navigate to
Preview
  2.  
  3. WJEC
  4.  
  5. Biology
  6.  
  7. 3. Requirements for life

Summary

Summary WJEC (England) Eduqas A-Level Biology 3. Requirements for life - 1. Plant Gas Exchange
 14 views  0 purchase
  • Course
  • 3. Requirements for life
  • Institution
  • WJEC

I achieved a high A* Grade in my final A-Level exams using these notes!!! I believe you can achieve an A* if you can memorise these notes! Simply use blurting, a method of active recall, to write everything you remember from the notes, then identify the parts you couldn’t remember, then repeat ...

[Show more]

Preview 1 out of 3  pages

Document information

  • May 2, 2023
  • 3
  • 2020/2021
  • Summary

Subjects

  • stomata
  • adaptations

Written for

  • A/AS Level
  • WJEC
  • Biology
  • 3. Requirements for life
All documents for this subject (7)

Seller

avatar-seller
tnotes

Reviews received

Content preview

J. structure of angiosperm leaf
Cuticle
Upper epidermis
Palisade mesophyll
Spongy mesophyll + air spaces
Lower epidermis: stomata + guard cell




K. Adaptations

light absorption
leaves
- plant can orientate towards light: expose greater SA to sun – absorb max light
- flat: large SA – absorb max light
- thin – allow light to penetrate
transparent cuticle & epidermis – allow light to penetrate
palisade cells
- elongated – reduce number of cell walls absorbing light (prevent it reaching chloroplasts)
- lots chloroplasts – absorb max light
o move inside cells – best position to absorb max light



gas exchange with air spaces & stomata
leaves
- thin: short diffusion distance
- flat: large SA – many stomata
spongy mesophyll
- large SA for gas exchange
- air spaces – allow gases to diffuse between stomata & cells
- moist



reduce water loss – moist gas exchange surface (dehydrated with water loss)
- Waxy cuticle – reduce water loss by evaporation
- Guard cells: change shape to close stomata at night + only on bottom (less sunlight for evaporation)




L. role of leaf as organ of gas exchange
Rely entirely on diffusion
Respiration: all day
Photosynthesis: sunlight hours


stomatal opening
- light: guard cells photosynthesise = ATP – actively transport K + in
- triggers conversion: starch (insoluble) to malate ions (soluble)
- K+ & malate ions: lower water potential – water enters by osmosis = turgid
- outer wall: thinner – stretches more than inner wall = pore between guard cells

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

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 tnotes. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for CA$5.57. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

73314 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
CA$5.57
  • (0)
  Add to cart