Increase in the carbon dioxide level in the outside air over the normal limit results in __________ in rate of transpiration.
increase
decrease
static
both a and b
Adhesive and cohesive forces are
physical forces
chemical forces
electrical forces
magnetic forces
Stomata of a plant open due to
influx of hydrogen ions
influx of calcium ions
influx of potassium ions
efflux of potassium ions
Water and salts move from one cell to the next cell by
osmosis
transpiration
absorption
Diffusion
The rate of transpiration will ________ with the decreases in atmospheric pressure.
decrease slowly
decrease rapidly
none of the above
Ascent of sap takes place through
xylem fibres
xylem parenchyma
xylem vessels
none of these
Guard cells help in
protection against grazing
guttation
fighting against infection
From root hairs water and salts pass into epidermal cells _______ cells, endodermis and finally into xylem.
guard cells
cortical
stomata
phloem
In which condition the transpiration pull is maximum?
Open stoma, dry atmosphere and moist soil
closed stomata, dry atmosphere and moist soil
closed stoma, dry atmosphere
open stoma, high humid atmosphere and dry soil
The escape of sap from the cut or ruptured parts of the plant is called
bleeding
clotting
