#Question id: 10494
#Unit 6. System Physiology – Plant
Sucrose is an osmotically active solute in guard cells, One implication of these osmoregulatory features is that stomatal opening & closing is associated with which of the following given statements?
#Question id: 10493
#Unit 6. System Physiology – Plant
Which wavelength modulates guard cell osmoregulation by means of its activation of proton pumping, solute uptake, and stimulation of the synthesis of organic solutes;
#Question id: 10491
#Unit 6. System Physiology – Plant
Acidification of the lumen stimulates zeaxanthin formation, and alkalinization favors violaxanthin formation. Lumen pH depends on photosynthetic photon flux density, most effective at
#Question id: 10490
#Unit 6. System Physiology – Plant
Which of the following is a correct Match of the stomatal opening and closing mechanism;
| COLUMN A | COLUMN B |
| P- Opening of Stomata | i) Chloride anions are taken up into the guard cells from the apoplast |
| Q- Closing of stomata | ii) The malate content of guard cells decreases |
| iii) starch content in guard cells increases during end of the | |
| iv) Acidification of the lumen stimulates zeaxanthin formation which activates the H+ ATPase causing | |
| v) Accumulation of solute in vacuole such as sucrose and malate leads to |
#Question id: 10489
#Unit 6. System Physiology – Plant
Malate anions, by contrast, are synthesized in the guard cell cytosol, in a metabolic pathway that uses carbon skeletons generated by
#Question id: 10488
#Unit 6. System Physiology – Plant
Blue light activates a proton pump at the guard cell plasma
membrane. The relationship between proton pumping at the guard cell plasma
membrane and stomatal opening is evident from the observations that;