#Question id: 10165
#Unit 6. System Physiology – Plant
In the C4 photosynthetic carbon cycle involves uptake of CO2 in the form of HCO3-, the acceptor of the HCO3- is
#Question id: 10166
#Unit 6. System Physiology – Plant
plants such as maize whose vascular tissues are surrounded by two distinctive photosynthetic cell types In this anatomical context, the transport of CO2 from the external atmosphere to the bundle sheath cells proceeds through five successive stages such as;
a.) Fixation of the HCO3 − in phosphoenolpyruvate by PEP Case in the bundle sheath cells
b.) Transport of the four-carbon acids (malate or aspartate) to mesophyll cells that surround the vascular bundles
c.) Decarboxylation of the four-carbon acids and generation of CO2 which is then reduced to carbohydrate via the Calvin–Benson cycle
d.) Transport of the three-carbon backbone (pyruvate or alanine) formed by the decarboxylation step back to the mesophyll cells
e.) Regeneration of phosphoenolpyruvate, the HCO3 – acceptor
Which of the following stages are FALSE?
#Question id: 10167
#Unit 6. System Physiology – Plant
Mechanisms of C4 acid transported mesophyll → bundle sheath for decarboxylation, which of the following CORRECT combination of decarboxylation process?
a.) NADP–malic enzyme (NADP–ME)→ transport Malate from mesophyll to bundle sheath
b.) NAD–malic enzyme (NAD–ME)→ transport Aspartate from mesophyll to bundle sheath
c.) PEP carboxykinase (PEPCK)→ transport Aspartate from mesophyll to bundle sheath
d.) PEP carboxylase (PEPCase)→ transport Malate from mesophyll to bundle sheath
#Question id: 10168
#Unit 6. System Physiology – Plant
Mesophyll cells of NADP–ME type C4 photosynthesis use four transport steps across the chloroplast envelope to fix one molecule of atmospheric CO2
a.) import of cytosolic pyruvate through unknown transporter
b.) import of cytosolic oxaloacetate through dicarboxylate transporter
c.) Import of stromal phosphoenolpyruvate through unknown transporter
d.) export of stromal malate through dicarboxylate transportere.) export of stromal phosphoenolpyruvate through phosphoenolpyruvate phosphate translocator
f.) export of cytosolic oxaloacetate through dicarboxylate transporter
Find the correct four transporter from the given statements
#Question id: 10169
#Unit 6. System Physiology – Plant
Which of the following is not the effect of C3 and C4 cycle in hot and dry climates ?
#Question id: 10170
#Unit 6. System Physiology – Plant
Which of the following given facts regarding CAM Plants are TRUE?
a.) The leaves of CAM plants have traits that minimize water loss, such as thick cuticles, large vacuoles, and stomata with small apertures
b.) All CAM plants, the initial capture of CO2 into four-carbon acids takes place at night, and the posterior incorporation of CO2 into carbon skeletons occurs during the day
c.) The CO2 taken up during the night is fixed into malate
d.) Tight packing of the mesophyll cells enhances CAM performance by restricting CO2 loss during the day