Location of $SDH$ (Succinate dehydrogenase) enzyme of the Krebs cycle in plants is

In respiration,pyruvic acid is .........

Identify $A$ and $B$ in the given reaction:
$\text{Pyruvic acid} + \text{CoA} + \text{NAD}^+ \xrightarrow{\text{Mg}^{2+}} A + B + \text{NADH} + \text{H}^+$

In one turn of the citric acid cycle,how many substrate-level phosphorylation reactions occur?

One molecule of $\text{GTP}$ is synthesised in the citric acid cycle,during conversion of :

In aerobic respiration,the complete oxidation of pyruvate by the stepwise removal of all the hydrogen atoms produces how many molecules of $CO_{2}$?