Answer:
(a) Differences between Respiration and Combustion
(b) Differences between Glycolysis and Krebs' Cycle
S.N.
Respiration
Combustion
1.
2.
3.
4.
It is the breakdown of complex
compounds through oxidation within
the cells, leading to release of
considerable amount of energy,
It is a controlled biochemical
process,
Many chemical bonds break
simultaneously by releasing large
amount of energy
Enzymes are involved.
Combustion is the complete burning
of glucose, which produces CO2 '
and H2O and yield energy which is
given out as heat.
It is an uncontrolled physico
chemical process.
Chemical bonds break one after
another to release energy.
Enzymes are not involved.
(c) Differences between Aerobic Respiration and Fermentation
S.N.
Glycolysis
Krebs' Cycle
1.
2.
3.
4.
It is also called as Embden Meyern of-Parnas (EMP) pathway,
It occurs in the cytosol of prokaryotes as well as eukaryotes.
It starts with the oxidation of glucose.
It is an enzyme-controlled 10 steps process by which glucose, fructose or sucrose is reduced to form pyruvic acid with the production of ATP and NADH2.
It is also known as citric acid cycle or tricarboxylic acid cycle.
In eukaryotes, is occurs in matrix of mitochondria and in prokaryotes, it occurs in cytoplasm.
It starts with the oxidation of pyruvic acid.
It involves 8 steps to oxidise two molecules of acetyl Co-A.
S.N.
Aerobic Respiration
Fermentation
1.
2.
3.
4.
The presence of O2 is required for
complete oxidation of organic
substances.
It releases CO 2 water and a large
amount of energy present in the
substrate,
Only to molecules of ATP are
produced,
NADH is oxidized to NAD + slowly.
In complete oxidation of glucose
occurs in the absence of oxygen.
Pyruvic acid is converted to CO2 and ethanol and less amount of energy is released.
Many molecules of ATP are produced.
This reaction is very vigorous under aerobic respiration.
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