The smooth ER is especially abundant in cells that synthesize extensive amounts of

#Question id: 10162

#Unit 6. System Physiology – Plant

Following are certain statements regarding C3, C4 and CAM plants

a.) The atmospheric CO2 assimilates into the single cell C4 cycle diatoms, C4 conc. Is higher at the external side where the C3 conc. Is higher at the internal side where the CO2 assimilation takes place and the transport to the vascular tissue

b.) In mitochondria, two molecules of glycine yield a molecule of serine with the concurrent release of CO2 and NH4+ by the successive action of the glycine decarboxylase complex Only

c.) Plant with the C4 metabolism need less rubisco than C3 plants to achieve a given rate of Photosynthesis

d.) CAM Plant PEP Case only active during the Dark due to its phosphorylation while C4 PEP Case active throughout the day

Which of the following combination from above statements are TRUE?

#Question id: 10163

#Unit 6. System Physiology – Plant

Some statements regarding C2, C3, C4 and CAM plants

a.) For Sucrose synthesis after C2 C3 and C4 cycle having different procedure

b.) C4  cycle reduces occurrence of C2 which is thermodynamically very expensive and toxic by increasing the assimilation of CO2 at high temperature almost at 35⁰ C

c.) C4 plant is generally found in near to equator  and they are more abundant than C3 plant

d.) In Dark when stomata are closed and CO2 not assimilated in the CAM plants

Which of the following statements from above combination is true?

#Question id: 10164

#Unit 6. System Physiology – Plant

C4 photosynthetic carbon cycle is also known as the

#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