Plant adaptations (exam 2)

Question 1

Plant morphological adaptations to life on land (2)

Answer 1

Waxy cuticles
Stomata for gas exchange

Question 2

Water potential

Answer 2

potential Energy of water in system vs. pure water at atmosphereic Pressure, at the same Time.
in MegaPascals (MPa)
water poteintal usually negative (-MPa)
Closer to zero = higher

Question 3

TRANSPIRATION-COHESION THEORY

Answer 3

Transpiration thru leaves driven by low atmosphereic water potiental

Water flows down the gradient from higher to lower water potential.

HOH drawn from soil into root by water potiental gradient

Question 4

Water-use efficiency

Answer 4

-amount water lost fixing one mole CO2
-decreased water lost –> increase Water use efficienty
-increase in CO2 inside lf stomata close.
-increase in water loss in stomata opens