Water Transport In Plants

Question 1

Apoplast Pathway

Answer 1

Water moves through spaces in the cell walls and between cells because of the cohesive and adhesive properties of water.

Question 2

Symplast Pathway

Answer 2

Water moves from cell to cell through the cytoplasm and plasmodesmata because of water potential gradients

Question 3

Casparian strip

Answer 3

This is a band of a waterproof substance called suberin that surrounds the endodermis cells. It forces water out of the apoplast pathway and into the symplast pathway.

Question 4

Cohesion

Answer 4

Hydrogen bonding causes water molecules to stick together and move as one continuous column

Question 5

Adhesion

Answer 5

Hydrogen bonding between polar water molecules and non-polar cellulose in xylem vessel walls pulls water upwards through the xylem

Question 7

Factors affecting transpiration

Answer 7

• Temperature
• Humidity
• Light Intensity
• Wind Speed