The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of
lignified thick walls
cohesion and adhesion
weak gravitational pull
transpiration pull
The movement of water from one cell of the cortex to the adjacent one in roots is due to
accumulation of inorganic salts in the cells
accumulation of organic compounds in the cells
chemical potential gradient
water potential gradient
Some of the growth regulators affect stomatal opening. Closure of stomata is brought about by
indole butyric acid
abscisic acid
kinetin
gibberellic acid
Guttation is caused by
transpiration
osmosis/DPD
root pressure
osmotic pressure
Two cells A and B are contiguous. Cell A has osmotic pressure 10atm, turgor pressure 7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will be
movement of water from cell B to A
no movement of water
equilibrium between the two
movement of water from cell A to B
If turgidity of a cell surrounded by water increases, the wall pressure will
increase
decrease
fluctuate
remain unchanged
In soil, water available for roots (to plants) is
capillary water
hygroscopic water
gravitational water
chemically bound water
Stomata of a plant open due to
influx of hydrogen ions
influx of calcium ions
influx of potassium ions
efflux of potassium ions
Stomata in angiosperms open and close due to
their genetic constitution
effect of hormones
change of turgor pressure in guard cells
pressure of gases inside the leaves
Water enters a cell due to
OP
SP
TP
WP