Resumen
Summary Leaf gas exchange
- Grado
- Institución
Year 1 Biology AQA A level notes. Achieved an A* in my final exam using these notes. They are based on the mark scheme requirements.
[Mostrar más]Vista previa 1 fuera de 1 páginas
Vista previa 1 fuera de 1 páginas
Añadir al carrito
Añadir al carrito
Vendedor
Seguir
arabellasherratt
Vista previa del contenido
Leaf gas exchange summary notes05 December 2022 11:33
- When photosynthesis is occurring most carbon
dioxide is obtained from external air, most
oxygen diffuses out of plant
- When photosynthesis is not occurring- ie in the
dark- oxygen diffuses into leaf as it is constantly
being used for respiration- carbon dioxide
produced in respiration diffuses out
Structure
- Large surface area- Diffusion takes place in gas
phase which makes it more rapid - palisade and
spongy mesophyll tissue are surrounded by air
spaces over which gases can exchange which
increases the surface area for gas exchange
- Short diffusion distance- each photosynthetic cell
is surrounded by air spaces, chloroplasts are
positioned next to cell wall, cross section of leaf is
thin- minimises diffusion distance between open
stomata and photosynthetic cell
- Steep concentration gradient- in day time the
rate of photosynthesis is high, CO2 is being used
to synthesise glucose- this ensures that the
palisade and spongy mesophyll tissue have a low
CO2 concentration relative to the outside air-
CO2 diffuses down the concentration gradient
through the open stomata
Leaves
- Stomata - short diffusion distance - most on the
underside of leaf. Have guard cells that surround
them which open and close the stomatal pore-
controls rate of gas exchange - balances
conflicting needs of gas exchange and control of
water loss- close stomata when water loss would
be excessive
Los beneficios de comprar resúmenes en Stuvia estan en línea:
Garantiza la calidad de los comentarios
Compradores de Stuvia evaluaron más de 700.000 resúmenes. Así estas seguro que compras los mejores documentos!
Compra fácil y rápido
Puedes pagar rápidamente y en una vez con iDeal, tarjeta de crédito o con tu crédito de Stuvia. Sin tener que hacerte miembro.
Enfócate en lo más importante
Tus compañeros escriben los resúmenes. Por eso tienes la seguridad que tienes un resumen actual y confiable. Así llegas a la conclusión rapidamente!
Preguntas frecuentes
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.
100% de satisfacción garantizada: ¿Cómo funciona?
Nuestra garantía de satisfacción le asegura que siempre encontrará un documento de estudio a tu medida. Tu rellenas un formulario y nuestro equipo de atención al cliente se encarga del resto.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller arabellasherratt. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for 5,55 €. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
45,681 summaries were sold in the last 30 days
Founded in 2010, the go-to place to buy summaries for 14 years now