Differentiate between (Any two):
$(a)$ Respiration and Combustion
$(b)$ Glycolysis and Krebs' cycle
$(c)$ Aerobic respiration and Fermentation

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(N/A) Respiration and Combustion
RespirationCombustion
$(1)$ It is a biochemical process.$(1)$ It is a physiochemical process.
$(2)$ It occurs in living cells.$(2)$ It does not occur in living cells.
$(3)$ $ATP$ is generated.$(3)$ $ATP$ is not generated.
$(4)$ Enzymes are required.$(4)$ Enzymes are not required.
$(5)$ It is a biologically-controlled process.$(5)$ It is an uncontrolled process.

$(b)$ Glycolysis and Krebs' cycle
GlycolysisKrebs' cycle
$(1)$ It is a linear pathway.$(1)$ It is a cyclic pathway.
$(2)$ It occurs in the cytoplasm.$(2)$ It occurs in the mitochondrial matrix.
$(3)$ It occurs in both aerobic and anaerobic respiration.$(3)$ It occurs only in aerobic respiration.
$(4)$ It generates $2$ $NADH$ and $2$ $ATP$ molecules per glucose.$(4)$ It produces $6$ $NADH$, $2$ $FADH_2$, and $2$ $ATP$ per two acetyl-$CoA$ molecules.

$(c)$ Aerobic respiration and Fermentation
Aerobic respirationFermentation
$(1)$ Oxygen is used for energy derivation.$(1)$ Occurs in the absence of oxygen.
$(2)$ Occurs in the cytoplasm and mitochondria.$(2)$ Occurs only in the cytoplasm.
$(3)$ End products are $CO_2$ and $H_2O$.$(3)$ End products are ethyl alcohol and $CO_2$.
$(4)$ Complete oxidation of substrate occurs.$(4)$ Incomplete oxidation of substrate occurs.
$(5)$ About $36$ $ATP$ molecules are produced.$(5)$ Only $2$ $ATP$ molecules are produced.

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