Which main events occur in aerobic respiration?

What is the significance of the Krebs cycle?

For the existence of nitrogen in its stable molecular form,how many nitrogen atoms are required?

Choose the correct statements:
$(i)$ The complete combustion of glucose,which produces $CO_2$ and $H_2O$ as end products,yields energy,most of which is given out as heat.
$(ii)$ The scheme of glycolysis was given by Gustav Embden,Otto Meyerhof,and $J$. Parnas and is often referred to as the $EMP$ pathway.
$(iii)$ In glycolysis,$ATP$ is utilised at $2$ steps,not $4$.
$(iv)$ In both lactic acid and alcohol fermentation,not much energy is released; less than $7$ percent of the energy in glucose is released and not all of it is trapped as high-energy bonds of $ATP$.
$(v)$ For aerobic respiration to take place within the mitochondria,the final product of glycolysis,pyruvate,is transported from the cytoplasm into the mitochondria.

Match the processes involved in aerobic respiration given in Column-$I$ with their occurrence in the cell from Column-$II$ and choose the correct option.

Column-$I$	Column-$II$
$i$. Glycolysis	$b$. Cytoplasm
$ii$. Krebs cycle	$a$. Mitochondrial matrix
$iii$. $ETS$	$c$. Inner mitochondrial membrane

Select the correct option:
$(1)$ Fermentation / Aerobic respiration does not have an electron transport system.
$(2)$ Combustion / Respiration is a biochemical process.