XYLEMS

Question 1

Define Xylem

Answer 1

The tissue in a plant that transports water and mineral ions from roots to the leaves and shoots

Question 2

Define Transpiration

Answer 2

Transpiration is the loss of water vapour from plant leaves. Water vapour is lost by evaporation at the surface of the mesophyll cells; this water vapour then diffuses through the stomata and out of the plant

Question 3

Cohesion in H2O/nutrient transport in plants

Answer 3

• Applies for xylems, a specialized pathway for water and nutrients
  → root → stem → leaf
• Roots absorb water & nutrients → travels up the xylem/stem → reaches the leaves (used for photosynthesis)
  → Upward movement fights against the force of gravity as it travels up the plant
  → Plants r erect to grab as much sunlight as possible
• Process of transpiration & cohesion allows the water to travel upwards the xylem despite the force of gravity
  → As plants leave the plant thru the stomata of the leaves, it leaves room for more H2O molecules to move up thru cohesive forces

Question 4

Adhesion in H2O/nutrient transport in plants

Answer 4

• The xylem walls are composed of polar molecules, like H2O. ∴ H2O molecules r attracted to the walls
  → attraction between these forces help create tension which supports upward movement against gravity