Conversion of starch to organic acid is essential for
stomatal closure
stomatal opening
stomatal initiation
stomatal growth
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
Root system in a plant is well developed
due to deficiency of auxins
due to deficiency of cytokinins
due to deficiency of minerals
for increased absorption of water
Guard cells help in
protection against grazing
transpiration
guttation
fighting against infection
Osmotic pressure in the leaf cells is positive during
excessive transpiration
low transpiration
excessive absorption
Water enters a cell due to
OP
SP
TP
WP
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
Basis of stomatal opening is
exosmosis
endosmosis
decrease in cell sap concentration
plasmolysis of guard cells
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.
In guard cells when sugar is converted into starch the stomatal pore
opens fully
opens partially
closes completely
remains unchanged
