#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: 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: 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: 10472
#Unit 6. System Physiology – Plant
In greenhouse grown leaves of broad bean stomatal movements closely correlate with incident solar radiation at the leaf surface and stomatal aperture opening and closing as light levels reaching the leaf surface given in graph
A. Mid of the day stomatal aperture has a largest
diameter, water loss and transpiration rate will be highest at the same time
B. In mid of the day incident light is highest in
terms of PPFD and can also say CO2 diffusion will be highest
C. The stomatal aperture has a largest diameter
resulting closing of stomatal pore, water loss and transpiration rate will be
lowest due to closing of stomata
D. In mid of the day incident light is highest in
terms of PPFD resulting CO2 will not diffuse
which of the following combination from the given graph will be CORRECT?
#Question id: 10471
#Unit 6. System Physiology – Plant
Under temperate conditions, which one of the two major factors that are involved with light-dependent stomatal opening are,
#Question id: 10470
#Unit 6. System Physiology – Plant
when the environmental stimuli associated with high CO2 demand inside the leaf are transduced into