Xylem & Phloem Flashcards

All 5 cards in this deck

Name two substances transported by xylem and state the direction of movement.

Water and mineral ions, carried upwards from the roots to the leaves.

Give two structural features of xylem vessels.

Thick (lignified) walls and continuous hollow tubes with no end walls.

Why are xylem vessel walls lignified?

Lignin strengthens the walls, supporting the plant and stopping the vessel collapsing.

Describe the structure of phloem tissue.

Living cells joined end to end with sieve plates that have pores, plus companion cells containing many mitochondria.

True or false? Phloem transports sucrose without using any energy.

False. Phloem cells are living and use energy (from companion cell mitochondria) to transport sucrose.