biology unit 8

Question 1

State the functions of xylem and phloem

Answer 1

xylem - transport of water and mineral ions, and support

phloem - transport of sucrose and amino acids

Question 2

State that the large surface area of root hairs

Answer 2

increases the uptake of water and mineral ions

Question 3

Outline the pathway taken by water through the root, stem and leaf as:

Answer 3

root hair cells > root cortex cells > xylem > mesophyll cells

Question 4

Describe transpiration

Answer 4

as the loss of water vapour
from leaves

Question 5

State that water evaporates from the surfaces of

Answer 5

the mesophyll cells into the air spaces and then
diffuses out of the leaves through the stomata as
water vapour

Question 6

Describe translocation

Answer 6

as the movement of
sucrose and amino acids in phloem from sources
to sinks

Question 7

Describe sources

Answer 7

as the parts of plants that release sucrose or amino acids

Question 8

describe sinks

Answer 8

sinks as the parts of plants that use or store
sucrose or amino acids