#Question id: 10482
#Unit 6. System Physiology – Plant
A herbicides dichlorophenyldimethylurea (DCMU) is known as diuron an inhibitor of photosynthetic electron transport. Which one of the following option would be correct about diuron?
a.) Blocks electron flow at the plastoquinone acceptors of PSII by competing for the binding site of plastoquinone
b.) causes a partial inhibition of stomatal closing
c.) accepts electrons from the early acceptors of PSI such as A0 and then reacts with oxygen to form superoxide, O2 –
d.) causes a partial inhibition of light-stimulated stomatal opening
#Question id: 10483
#Unit 6. System Physiology – Plant
Given below some facts regarding the stomal responses in light condition. Which one of the following would be INCORRECT?
#Question id: 10484
#Unit 6. System Physiology – Plant
Blue light mediated activation of proton pumps which is electrogenic in nature can be measured or analyze by using which system?
#Question id: 10485
#Unit 6. System Physiology – Plant
What is the role of blue light in terms of stomatal study?
a.) Blue light activates a proton-pumping ATPase in the guard cell plasma membrane and leading to stomatal opening
b.) blue-light stimulation lowers the pH of the apoplastic space surrounding the guard cells, and generates the driving force needed for ion uptake and stomatal opening
c.) The sensitivity of guard cells to blue light increases as a function of their zeaxanthin concentration
d.) npq1 mutant opens at higher fluence rates of blue light, whereas the phot1/phot2 mutant fails to show any blue light–stimulated opening
Which one of the following combination is correct?
#Question id: 10486
#Unit 6. System Physiology – Plant
A patch clamp study shows a guard cell protoplast treated in the dark with the fungal toxin fusicoccin which is a well-characterized,
#Question id: 10487
#Unit 6. System Physiology – Plant
During the patch clamp experiments measure outward electric
current in picoamps, pA at the plasma membrane of a guard cell protoplast
stimulated by two points A and B showing in the graph.
What is A and B
