77837
Transpiration + translocation
- Transpiration
- Loss of water vapour from aerial part of a plant
- Inevitable process of photosynthesesis.
- Stomata are open for gaseous exchange
- Stomata are open for gaseous exchange
- Osmosis from xylem vessels to mesophyll cells
- Evaporation mesophyll into air spaces
- Diffusion of water vapour through stomata
- Diffusion of water vapour through stomata
- Evaporation mesophyll into air spaces
- Increase
- No of leaves (SA)
- Density of stomata
- Light intensity
- Temperature
- Wind Speed
- Wind Speed
- Temperature
- Light intensity
- Density of stomata
- No of leaves (SA)
- Decrease
- Thick waxy cuticle
- Specialised adaptions
- Xerophytes
- Smaller leaves
- Thick waxy cuticle
- Dense spongy mesophyll reduces air spaces
- Hair on suface = moist trapped air, lower WP
- Sunken stomata pits = moist trapped air, lower WP
- Sunken stomata pits = moist trapped air, lower WP
- Hair on suface = moist trapped air, lower WP
- Dense spongy mesophyll reduces air spaces
- Thick waxy cuticle
- Smaller leaves
- Xerophytes
- Humidity
- Thick waxy cuticle
- Loss of water vapour from aerial part of a plant
- Translocation
- Movement of assimilates
- Sink - removes sucrose from phloem
- Source - releases sucrose into phloem
- Source - releases sucrose into phloem
- Leaf = source, sucrose produced
- Sucrose moves to phloem, active transport
- High to Low
- Water moves down phloem, and contents down sieve elements
- Contents move to sink (bud)
- High to Low
- Sucrose into sink via facilitated diffusion
- Sucrose into sink via facilitated diffusion
- High to Low
- Contents move to sink (bud)
- Water moves down phloem, and contents down sieve elements
- High to Low
- Sucrose moves to phloem, active transport
- H+ pumped out of companion cell
- Ions diffuse back into companion cell, with sucrose - facilitated diffusion
- Sucrose, HIGH TO LOW into sieve tube elements
- Sucrose, HIGH TO LOW into sieve tube elements
- Ions diffuse back into companion cell, with sucrose - facilitated diffusion
- Movement of assimilates
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