Plants transport Flashcards
What substance is vitally important for all plants?
Water
What do plants use light energy to do?
To photosynthesise; convert carbon dioxide and water into glucose and oxygen.
What must plants have to allow water to move from where it is absorbed to where it is needed?
A transport system
What vessel does the water move up through plants in?
Xylem
What substance is the xylem strengthened by?
Lignin- spirals or curls around it
What is the function of a guard cell?
It controls wether the stomata are opened or closed
Why do leaves have a large surface area?
To absorb light
What are stomata?
Stomata are pores found on the surfaces of leaves
What do the stomata do?
They allow gases to move into and out of the leaf and also allows water vapour to leave the plant by evaporation
What happens to the guard cells when a plant has a little water?
The guard cells become plasmolysed and the stomata close this conserves the water
What happens to the guard cells if the plant has a good supply of water?
The guard cells become turgid and the stomata open
Why are most of the stomata found on the lower surface of the leaf?
Because the stomata are protected from wind and sunlight so they don’t loose as much water
What is transpiration?
Transpiration is the diffusion of water vapour from the leaf into the air
Why do root hair cells have extensions that project into the soil?
Because it increases the surface area to allow more absorption to take place.
What is sugar transported by in a plant?
Sugar is transported by tubes called phloem
