#Question id: 12194
#Unit 6. System Physiology – Plant
#Question id: 12193
#Unit 6. System Physiology – Plant
#Question id: 12192
#Unit 6. System Physiology – Plant
#Question id: 12191
#Unit 6. System Physiology – Plant
#Question id: 11902
#Unit 6. System Physiology – Plant
A chemiosmotic model
has been proposed to explain
Polar transport , following steps are involve in the transport of auxin
polarly;
a) IAA enters the cell either passively in the undissociated
form (IAAH) or by secondary active cotransport in the anionic form (IAA–)
b) The cell wall is maintained at an acidic pH by the
activity of the plasma membrane H+- ATPase
c) In the cytosol, which has acidic pH, the IAAH form
predominates
d) The anions exit the cell via auxin anion efflux carriers
that are concentrated at the basal ends of each cell in the longitudinal
pathway
Which of the following is the correct statements about the polarly transporting of auxin?
#Question id: 11850
#Unit 6. System Physiology – Plant
The first step in polar transport is auxin influx. According
to the model, auxin can enter plant cells from any direction by either of two
mechanisms:
a) Passive diffusion of the protonated (IAAH) form across
the phospholipid bilayer
b) Secondary active transport of the dissociated (IAA–) form
via a 2H+–IAA– symporter
c) Active diffusion of the protonated (IAAH) form across the
phospholipid bilayer
Find out the correct statements of about diffusion of IAA.