B2.2.4 - Plant Transport Systems

Question 1

Plants’ two transport systems

Answer 1

Xylem and phloem

Question 2

What does the xylem do?

Answer 2

Xylem tissue transports water and mineral ions from roots into whole plant
- water diffuses into roots (osmosis)
- mineral ions taken in (active transport)

Question 3

What does the phloem do?

Answer 3

Phloem tissue transports dissolved sugars (from photosynthesis) and other (soluble) food moles.
- known as translocation

Question 4

What is a vascular bundle?

Answer 4

The xylem and phloem tissue formed as a structure

Question 5

Explain the xylem structure

Answer 5

• made of dead xylem cells w no cell walls
• thickened cellulose for support
• one way only
• lignin stiffens the walls

Question 6

Explain the phloem structure

Answer 6

• living cells
• cell walls down break down fully
• sieve plates form w small holes, for sugar to go through
• two way flow

Question 7

How do vascular bundles provide support?

Answer 7

• In leaf: network forms supporting softer tissue
• In stem: located around outer edge, preventing stem bending in wind
• In root: central, roots act as anchor, bending in wind