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2.3 Organisation in Plants - Coggle Diagram
2.3 Organisation in Plants
Plant tissue structure
Mersistem tissue
Root and shoot tips
Contains stem cells
Where cell division occurs
Leaf structure
Plant organ
Palisade layer - top of leaf, contains chloroplasts for photosynthesis
Spongy mesophyll - facilitate diffusion of gases, loosely packed cells
Xylem and phloem - transport
Lower epidermis - contains stomata
Stomata and guard cells - gas exchange
Transport systems
Root hair cells
Adapted for exchange: thin. wall, large surface area, lots of mitochondria
Stem
Xylem
Transports water via transpiration
Dead, hollow cells, strengthened with lignin
Phloem
Made from elongated living cells
Transports sugars via translocation
The leaf
Stomata and guard cells control the rate of gas exchange and transpiration
Transpiration
Rate depends on: temperature, humidity, wind speed and light intensity
Water evaporates and exits the plant via the stomata