B3.1.3 Exchange systems in plants Flashcards
How does water enter a plant?
Through osmosis in the roots.
How do mineral ions enter a plant?
Through active transport in the roots.
What are the adaptations of root hair cells that allows them to maximise the efficiency of absorption?
High surface area
Short diffusion pathway
How does carbon dioxide enter a plant?
By diffusion through the stomata.
How does oxygen leave a plant?
By diffusion through the stomata.
How are leaves adapted to maximise the absorption of carbon dioxide and sunlight.
Flat shape = large surface area
Thin = short diffusion pathway
Stomata = Can open and close to allow diffusion.
What is the purpose of the internal air spaces in spongy mesophyll layer?
Increases surface area of leaf to absorb more carbon dioxide
What is the purpose of the guard cells around stomata?
Allows the size of stomata to be adjusted
Prevents water loss to stop the plant from wilting
Where does most of a plants water loss take place?
The stomata.
