#Question id: 9584
#Unit 6. System Physiology – Plant
In given Relationship of oxygen production to flash energy, the first evidence for the interaction between the antenna pigments and the reaction centre, What conclusion can be drawn about based on graph;
a.) several hundred pigments are associated with each reaction centre and that each reaction centre must operate four times to produce 1 molecule of oxygen—hence the value of 2500 chlorophylls per O2
b.) low light intensity of the curve, an increase in the number of photons stimulates a proportional increase in oxygen evolution. Thus, the slope of the curve measures the quantum yield for oxygen production
c.) The quantum yield for a particular process can range from 0 →if that process does not respond to light to 1.0→if every photon absorbed contributes to the process by forming a product
d.) O2 require more than a single photochemical event to be formed, and therefore have a lower quantum yield of formation than the photochemical quantum yield. It takes about ten photons to produce one molecule of O2, so the quantum yield of O2 production is about 0.1
Which of the following statements would be correct relates with graph?
#Question id: 9585
#Unit 6. System Physiology – Plant
In light reaction the reaction centre of PSII receives electron from water molecules by splitting into oxygen, If 5 oxygen molecules evolved per 50 quanta was
absorbed then what is the quantum yield?
#Question id: 9586
#Unit 6. System Physiology – Plant
The photochemical quantum efficiency (quantum yield) is nearly 100%, the energy conversion efficiency is only 27%, and the overall efficiency of conversion of solar
energy is only a few percent the solar energy storage efficiency is a measure of how much of the energy in the entire solar spectrum is converted to usable form, if it
can be measure in terms of C3 and C4 plant?
#Question id: 9587
#Unit 6. System Physiology – Plant
The structure of the four major protein complexes in the thylakoid membrane are organised form such as ;
a.) PSII is located predominantly in the stacked regions of the thylakoid membrane and Cytochrome b6f complexes are evenly distributed
b.) PSI and ATP synthase are found in the unstacked regions protruding into the stroma
c.) Lateral separation of the two photosystems requires that electrons and protons produced by PSII be transported directly to PSI and the ATP coupling enzyme
d.) Four main protein complexes of the thylakoid membrane, shown also are the two diffusible electron carriers—plastocyanin, which is located in the thylakoid lumen, and plastohydroquinone (PQH2) in the membrane, The lumen has a positive electrical charge with respect to the stroma
Which of the following statements correct?
#Question id: 9588
#Unit 6. System Physiology – Plant
The light-absorbing antenna systems are organised in different manner, which of the following statements about antenna would be Incorrect?
#Question id: 9589
#Unit 6. System Physiology – Plant
The physical mechanism by which excitation energy is conveyed from the chlorophyll that absorbs the light to the reaction centre, By this mechanism the excitation energy is transferred from one molecule to another by a nonradioactive process, this mechanism is known as