8- transport in plants

Question 1

how to identify xylem from phloem in a diagram

Answer 1

xylem is on the inside in the stem.
xylem on top in leaves.

Question 2

what happens when there is a lack of water in a plant

Answer 2

Wilting, as turgor pressure of vacuole on cell wall decreases

Question 3

explain what happens in translocation

Answer 3

1. movement of sucrose and a.a in phloem from sources to sinks
2. sources are where the solutions are made (high conc)
3. sinks is where they end up (low conc)

Question 4

where are sources and sinks in a plant

Answer 4

1. when growing:
   a- leaves are sources since they are actively PS
   b- reproductive structures and stem act as sinks
2. in winter: its the opposite

Question 5

what are phloem tubes made of

Answer 5

columns of elongated living cells with pores in the walls to allow for flow

Question 6

what are xylem tubes made of

Answer 6

1. tubes of dead cells joined together and no end walls to prevent obstruction flow of water and minerals
2. strengthened by material named lignin