As biology gas exchange in plants
- Created by: wahub ali
- Created on: 02-02-17 17:12
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- AS Biology: gas exchange - In plants
- Xerophytic - Marram grass
- Rolled leaf
- Traps water vapour inside the leaf, increasing the humidity: Leading to a less steep water potential gradient
- Stomata -sunken in pits
- They're sunk in pits: which helps reduce air movement
- Thick waxy cuticle
- Helps stop evapouration
- Rolled leaf
- Xerophytic plant: Cacti
- Contains a thick waxy cuticle
- Contains small surface area - Minimise evaporation. it does this by losing its spines
- Stems can store water. this makes them called "succulents"
- Stems are flated for expansion (to get to water)
- Wide spread root system
- Hydrophytes - Plants that live in water
- Challenges are to:
- Give O2 to their submerged tissue
- And to make sure to keep the plant "afloat"
- Meaning that they're exposed to the SUN for them to be photosynthesised
- Challenges are to:
- Other important features of plants:
- Stomata closes when water availability is low
- Some plants increase their salt content of their cells, reducing the water po within the cells leading to a less steep water potential gradient. this as a whole reduces evaporation
- This happens to cells that are exposed to air spaces
- Xerophytic - Marram grass
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