Basis of stomatal opening is
exosmosis
endosmosis
decrease in cell sap concentration
plasmolysis of guard cells
Stomata of CAM plants
open during the night and close during the day
never open
are always open
open during the day and close at night
Guttation is caused by
transpiration
osmosis/DPD
root pressure
osmotic pressure
In guard cells when sugar is converted into starch the stomatal pore
opens fully
opens partially
closes completely
remains unchanged
Opening and closing of stomata is due to
hormonal change in guard cells
change in turgor pressure of guard cells
gaseous exchange
respiration
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
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
An innovative professor who wanted to give a live demonstration of a physiological process, filled a glass bottle with previously moistened mustard seeds and water. He screwcapped the bottle and kept it away in a corner and resumed his lecture. Towards the end of his lecture there was a sudden explosion with glass pieces of bottle thrown around. Which of the following phenomena did the professor want to demonstrate ?
Diffusion
Osmosis
Anaerobic respiration
Imbibition
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
The direction and rate of water movement from cell to cell is based on
WP
TP
DPD
incipient plasmolysis
