Transport in plants
Studied by 0 people
Learn
Practice Test
Spaced Repetition
Match
Flashcards1/16
There's no tags or description
Looks like no tags are added yet.
Name | Mastery | Learn | Test | Matching | Spaced |
|---|
No study sessions yet.
17 Terms
What does the xylem do?
It transports water and mineral ions and supports the plant
What does the Phloem do?
It transports sucrose and amino acids
Where are the xylem and phloem found in the roots?
They’re found in the centre.
Where are the xylem and phloem found in the stems?
They’re arranged in groups close to the outer edge.
Where are the xylem and phloem found in leaves?
They’re found in the veins.
What are the features of xylem vessels?
Thick, strong lignified walls
No cell contents
Cells are joined end to end with no cross walls
This helps them carry out their functions of support and water transport.
How do root hair cell’s features help them?
Their large surface area helps them to absorb water and mineral ions.
How does water move from the root to the leaves?
Water moves from the root hair cells through the root cortex
Through the xylem
And into the mesophyll cells in leaves
What is transpiration?
The movement of water vapour from in-leaf air spaces to air outside the leaf, through the stomata.
Where does the water vapour in air spaces come from?
It comes from the mesophyll cells, as it evaporates through their cell walls.
What the water vapour from leaves do?
Reduces the pressure at the top of xylem vessels
Water moves up due to the transpiration pull.
What is transpiration pull?
When attractive forces between water molecules help the water move in a continuous column.
What increases the rate of transpiration?
High temperatures
High wind speeds
Why does high temperatures increase transpiration rates?
Increases the kinetic energy of molecules
Speeds up rate of evaporation and diffusion
Why do high wind speeds and low humidity increase transpiration rates?
It increases the diffusion gradient for water vapour from the air spaces in the surrounding air
Why do plants wilt?
When they lose water faster than they absorb it
Cells loose their turgidity
What is translocation?
The transport of sucrose and amino acids from sources to sinks in phloem tubes.