Transpiration Flashcards
Transpiration
process of plants losing water by evaporation through their stomata
Water Potential
water potential is the potential energy of water to move across a membrane and is measured in units of pressure called pascals
What is the formula for water potential?
water potential = solute potential + pressure potential
Solute Potential
inversely related to solute concentration; meaning if solute concentration increases solute potential decreases and vice versa
Pressure Potential
the amount of pressure in the solution
What happens if solute concentration increases?
water potential decreases
What happens if pressure increases?
water potential increases
Osmosis
water will move from a solution of higher water potential to lower water potential
Where does water exit?
through the stomata (which is located on the leaf)
What is the cohesive nature of water?
basically means water sticks to itself
Water Moving up the Plant
negative pressure potential; cohesion; as water transpires` out the pressure potential decreases allowing the water potential to increase and water is pulled up
What does stomata do?
let out water and take in carbon dioxide
What controls the opening of stomata?
guard cells
How does the stomata react to sunrise and sunset?
sunrise- stomata open to start photosynthesis
sunset- stomata close because there is no more light for photosynthesis
Waxy Cuticle
leaf and stem epidermis has waxy cuticle; minimizes water loss but prevents gas exchange; which is why stomata are important
Hypotonic
less concentration; more water
Hypertonic
more concentration; less water
Isotonic
equal solutes and water
Humidity and Transpiration
HIgh humidity decreases transpiration and low humidity increases transpiration
Temperature and Transpiration
warmer temperatures increase transpiration, but if temps are too high and the plant risks losing too much water it will slow transpiration
Wind and Transpiration
as wind increases it increase transpiration; if wind decreases temperature then it will decrease transpiration
Which one has more water or is hypotonic? Solution that has -1 water potential or solution that has -3 water potential
-1; if a water potential is less negative is means that the water potential is higher because there is more water to move around
Which one has more solute or is hypertonic? Solution that has -1 water potential or solution that has -3 water potential
-3; if a water potential is more negative it more than likely means that it has more solute in it and there is less water to move around
