Transport in Plants
Plant organs
Why do plants need a transport system?
Phloem
Loss of water from plants
Factors effecting rate of transpiration
Xylem
- Plant organs include roots, stems and leaves
- Each play an importwant role in the plants survival ensuring it recieves nutrients
Parts of leaf with explanation
- Guard cells surround stomata: allow gas exchange - Co^2 out and Oxygen in
- The mesophyll have many chloroplasts - where photosynthesis occurs
- To supply minerals which are dissolved in water
- e.g nitrates - proteins, magnesium - chlorophyll
Potassium - flowers - roots
- To distribute glucose up and down the plant
- To supply water for photosynthesis
- Glucose is used for:
-Respiration
-conversion into starch for storage,
-conversion into cellulose for cell walls
- Transports water and minerals
-which enters through root hair cells
-xylem is non-living, it is hollow
-has rings of lignin which provide it support
- Glucose is made in the leaves by photosynthesis
- Glucose can travel to all other parts of the plant
- Transports sugar
-phloem are made of living cells
-are made of sieve tubes and companion cells
- Most water is lost through the stomata by Evapotration
- Guard cells open when filled with water Osmosis
- Water is lost from a plant by Transpiration
- Transpiration occurs during daylight when the stomata are open
Humidity - higher temperatures mean higher the rate of transpiration
Surface area - increased surface area increases the rate of transpiration
Wind Speed - the higher the wind speeds the higher the rate of transpiration