Ch. 8 Transport in plants ✅ Flashcards
What absorbs water/mineral ions and transports it to the leaves?
Xylem
What transports sucrose and amino acids from leaves?
Phloem
What is xylem?
Plant tissue made up of dead empty cells joined end to end
What is phloem?
Plant tissue made up of living cells
Where do xylem vessels run from?
From roots through steams to leaves
What are xylem vessels made of?
Ligning and cellulose
What is the purpose of ligning?
To support the plant
What is a vascular bundle?
A group of xylem and phloem tubes
Where is vascular bundle located in root?
At the centre
Where is vascular bundle located in steam?
Arranged in ring near outside edge
How are root hair?
Protective cap at the end, rest of root covered in cells called epidermis
What are epidermis?
Cells covering root hairs
What is the function of root hairs?
To absorb water and mineral ions
How does water move into root hair?
By osmosis
What happens after water moves into root hair?
Diffuses down concentration gradient
How does water move up xylem?
Higher and lower pressure, transpiration steam
What’s transpiration?
Loss of water vapour from a plant
Where does most of transpiration occur?
In the leaves
How happens transpiration?
Water leaves through stomata, moisture covering mesophyll cells leaves
What’s the transpiration pull?
A force produced by the loss of water vapour from a leaf, which reduces the pressure at the top of xylem vessels
What’s the rate of transpiration?
The rate at which a plant takes up water
How is transpiration rate measured?
By using photometer and recording how fast water meniscus goes up
What conditions affect transpiration rate?
- Temperature (higher temperature means higher transpiration rate)
- Wind (more wind = more transpiration rate)
- Humidity (more humidity = less transpiration rate)
What is the translocation?
The movement of sucrose and amino acids on phloem from sources to sinks
