Xylem And Phloem

Question 1

Phloem

Answer 1

Transports products of photosynthesis form source to sink.

Question 2

Xylem Components

Answer 2

• Lignin: coats cell walls. Waterproof and stops cell collapsing under high pressure
• Dead cells: flow of liquids doesn’t affect osmosis
• No end walls: continuous tube and no resistance
• Pits in walls: liquids move sideways in and out of vesicles.

Question 3

Phloem Components

Answer 3

• Lots of mitochondria and ribosomes: only in some cells. Supports other cells with little cytoplasm (supply’s protein/ATP).
• Sieve plates: end walls periferated, liquids move from cell to cell with little resistance.
• Minimum cytoplasm and organelles: more space to transport fluids, low resistance.
• Living cells

Question 4

Xylem

Answer 4

Transports water and mineral ions from roots to leaves.