10th of December

Question 1

explain how water enters root hairs and passes to the vascular tissue

Answer 1

H2O enters root hairs by osmosis
soil H2O is more dilute
H2O moves from cell to cell by osmosis

Question 2

Describe the principal features of the cohesion-tension model

Answer 2

transpiration pulls H2O up stem
H2O molecules stick together
forms continuous stream of H2O molecules
H2O molecules tend to adhere to xylem walls

Question 3

why is rate of transpiration and that of water uptake similar

Answer 3

high transpiration allows more water to be taken in

Question 4

2 conditions for the highest rate of transpiration

Answer 4

warmest and brightest times

Question 5

where is vascular tissue located in a young stem

Answer 5

in the vascular bundles

Question 6

how do minerals enter a plant?

Answer 6

by diffusion

Question 7

strong forces of attraction exist between water molecules. give an account of the importance of these forces in raising water to great heights in plants

Answer 7

called cohesion.
h2o evaporates from leaf and is replaces
causes tension- upward pull, of water
gives rise to a continuous stream of H2O

Question 8

1 type of modified stem and why is it a stem

Answer 8

potato stem tuber

has many vascular bundles