Guard cells help in
protection against grazing
transpiration
guttation
fighting against infection
Water enters a cell due to
OP
SP
TP
WP
Stomata of a plant open due to
influx of hydrogen ions
influx of calcium ions
influx of potassium ions
efflux of potassium ions
Osmotic pressure in the leaf cells is positive during
excessive transpiration
low transpiration
excessive absorption
Which of the following is an effective adaptation for better gas exchange in plants ?
Presence of multiple epidermis
Presence of hair on the lower epidermis
Presence of waxy cuticle covering the epidermis of the leaves
The location of the stomata primarily on the lower surface of the leaf, the side turned away from the direct sun rays.
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
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
In which of the following plant sunken stomata are found ?
Neriumspp
Hydrillaspp
Mango
Guava
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
osmosis/DPD
root pressure
osmotic pressure
