18 Questions
What percentage of water taken up by the root is lost as water vapor from the leaf in transpiration?
97%
What is the approximate ratio of water molecules diffused out to CO2 molecules diffused in during photosynthesis?
400:1
What is the primary property of water molecules that enables them to act as a wide-ranging solvent?
Hydrogen bonding ability
What is the essential physiological function that requires turgor pressure in plant cells?
Stomatal movement
What is the source of electrons that reduce CO2 to carbohydrate level during photosynthesis?
Water
What is the primary function of water in plant cells, apart from its solvent properties?
Turgor pressure creation
What is the primary mechanism driving transpiration in plants?
The absorption of sunlight by the leaves
What is the main function of the stomata in plant leaves?
To facilitate photosynthesis
What is the primary location of water evaporation in plant leaves?
The mesophyll cells
What percentage of a plant's water loss occurs through the stomata?
95%
What is the role of guard cells in regulating transpiration?
To balance water conservation with photosynthesis
What is the primary function of the cuticle in plant leaves?
To limit water loss through the leaf surface
Under what conditions is there no further net movement of water in a cell?
When the water potential of the cell is equal to that of the extracellular environment
What is the primary function of aquaporins in plant cells?
To facilitate the transport of water molecules across the plasma membrane
What happens to a cell when it loses turgor pressure?
It becomes flaccid
What determines the direction of water movement across membranes?
The difference in water potential
What is the result of turgid cells pushing against each other in nonwoody tissues?
The tissue becomes stiffened
What is the purpose of the partially elastic wall in a plant cell?
To exert turgor pressure and confine the pressurized protoplast
Learn how water moves into and out of plant cells, and the importance of balancing water uptake, transport, and loss in land plants.
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