2.3B Xylem

Question 1

xylem function

Answer 1

transport water from roots to stems and leaves, but it also transports nutrients.

Question 2

4 different types of cells

Answer 2

• vessels
• tracheids
• fibres
• xylem parenchyma

Question 3

function of vessel cells

Answer 3

the main conducting cells

Question 4

function of tracheids

Answer 4

conduct water but are not as well adapted as vessels

Question 5

function of fibres

Answer 5

used for support (no role of water conduction)

Question 6

function of xylem parenchyma

Answer 6

used as packing tissue (like bubble wrap)

Question 7

what are the vessels made of

Answer 7

dead cells joined together (forming long empty tubes)
containing lignin + cellulose

Question 8

lignin is….

Answer 8

tough and waterproof

Question 9

what characteristics does the appearance of xylem have

Answer 9

laid down in rings

Question 10

what stops xylem vessels from collapsing under pressure

Answer 10

lignin

Question 11

where is the xylem arranged in roots + why

Answer 11

arranged in centre.
ideal for anchoring plant in substrate

Question 12

where is the xylem arranged in stem + why

Answer 12

in vascular bundle, outside area
flexible support + resistance to bending