Distribution xylem and phloem

Question 1

3 reasons plants need transport system?

Answer 1

large size
metabolic demands
small sa:vol

Question 2

how does size impact need plant transport system?

Answer 2

water absorbed soil + light absorbed from above but both needed all over plant so needs to be transported
- large distance to travel

Question 3

how does metabolic demands impact need plant transport system?

Answer 3

• cells in roots need glucose for respiration but it is made in leaves + needs waste products removed
• ions for synthesis large mols need to go to all cells

Question 4

how does small sa:vol impact need plant transport system?

Answer 4

can rely on diffusion so needs transport system

Question 5

what is vascular bundle?

Answer 5

xylem + phloem
- structure + transport

Question 6

vascular bundle in stem?

Answer 6

several on outside for support of stem to prevent bending (in ring shape going all the way round)
xylem inside ( in dicot)
cambium has meristem cells (always divide)

Question 7

vascular bundle in roots?

Answer 7

• central with drill like structure to enable plant to push down into root to withstand tugging from wind
• Xylem strongest so in centre X like structure

Question 8

vascular bundle in leafs

Answer 8

xylem on top of phloem
midrib is main vein and gives support
branching smaller veins spread out and give support and transport to leaf
(think T shape for cross section)