The following statements regarding to the pancreas and its function.

a. The pancreas is composed of two major types of tissues, (1) the acini, which secrete digestive juices into the duodenum, and (2) the islets of Langerhans, which secrete insulin and glucagon directly into the blood.

b. The islets contain three major types of cells, alpha, beta, and delta cells

c. The beta cells, constituting about 25 percent of all the cells of the islets, lie mainly in the middle of each islet and secrete insulin and amylin.

d. The alpha cells, about 60 percent of the total, secrete glucagon and the delta cells, about 10 percent of the total, secrete somatostatin.

#Question id: 10497

#Unit 6. System Physiology – Plant

Blue light stimulated opening of stomata, closing of stomata is also takes place by many other such mutants and mechanisms such as,

a.) npq1 mutants leads to closing of stomata

b.) In high PPFD leads to conversion of violaxanthin to zeaxanthin which will  leads to closing of stomata

c.) Green light in the 500 to 600 nm region of the spectrum, abolishes the opening of stomata

d.) Mutant of phototropin 1 & 2 (PHOT1/PHOT2)  leads to closing of stomata

e.) Starch content in the guard cell decreases during closing of stomata at the end of the day

Which of the following given statements will be correct for closing of stomata?

#Question id: 10496

#Unit 6. System Physiology – Plant

Blue light–stimulated stomatal opening is abolished by green light in the 500 to 600 nm region of the spectrum,what are these alphabet showing in the graph?

#Question id: 10495

#Unit 6. System Physiology – Plant

Guard cells have different mechanisms mediating responses to blue light. The npq1 mutant has a lesion in the enzyme that covert violaxanthin to zeaxanthin. What will causes if the npq1 mutant?

#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