Gas Exchange/Water loss in plants
- Created by: jessicawarren
- Created on: 25-04-16 13:59
View mindmap
- Gas Exchange in Plants
- DicotyledonosPlants
- 1) Plants need CO2 for photosynthesis, produces O2 as waste gas. Need O2 for respiration which produces CO2 as waste gas
- Exchange gases at surface of mesophyll cells. Large SA
- 3) Gases move in and out through stomata in epidermis
- 4) Stomata can open to allow exchange of gases, close if plant loses too much water. Guard cells control opening/closing of stomata
- Water loss in insects
- Close spiracles using muscles
- Have waterproof, waxy cuticle- reduces evaporation
- Tiny hairs around spiracles, reduces evaporation
- Water loss in plants
- Stomata usually kept open during the day to allow gaseous exchange
- Water enters guard cells, making them turgid, opens stomatal pore
- If plant becomes dehydrated, guard cells lose water, become flaccid, closes pore
- Xerophytes
- Warm, dry, windy habitats
- Stomata sunk in pits that trap moist air, reduces evaporation
- Layer of hairs around epidermis to trap layer of moist air
- Curled leaves with stomata inside, protects them from wind/diffusion
- Reduced number of stomata, less places for water to escape
- Waxy, waterproof cuticles to reduce evaporation
- DicotyledonosPlants
Comments
No comments have yet been made