In which processes do the enzymes succinate dehydrogenase and cytochrome oxidase occur,respectively?

The term 'floating respiration' is used when the respiratory substrate is .........

Given below are two statements.
Statement-$I$: Conversion of pyruvic acid to acetaldehyde in prokaryotes occurs in cytoplasm.
Statement-$II$: Conversion of pyruvic acid to acetyl CoA in eukaryotes occurs in mitochondria.
In the light of above statements,choose the correct answer from the options given below.

$A$: Carbohydrates are the primary source of energy in living organisms.
$R$: Glucose is the common substrate used in respiration.

How many statements from the following are correct?
$(a)$ In plants,phosphorylation occurs by three different ways.
$(b)$ Substrate level phosphorylation is a direct phosphorylation of $ADP$ by transfer of a phosphate group from any suitable substance.
$(c)$ Substrate level phosphorylation occurs in the cytoplasm of the cell only.
$(d)$ Oxidative phosphorylation occurs on the inner mitochondrial membrane only.

The hexose monophosphate shunt is also called