Biology Class 11 NCERT Solutions: Chapter 14 Respiration in Plants Part 2 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Q: 5. Give the schematic representation of an overall view of Krebs cycle.


Q_5_Krebs Cycle

Q: 6. Explain ETS.


ETS or electron transport system is located in the inner mitochondrial membrane. It helps in releasing and utilizing the energy stored in , which is formed during glycolysis and citric acid cycle, gets oxidized by dehydrogenase (complex I) . The electrons so generated get transferred to ubiquinone through . In a similar manner, (complex II) generated during citric acid cycle gets transferred to ubiquinone. The electrons from ubiquinone are received by cytochrome (complex III) and further get transferred to cytochrome c. The cytochrome c acts as a mobile carrier between complex III and cytochrome c oxidase complex, containing cytochrome a and , along with copper centres (complex IV) .

During the transfer of electrons from each complex, the process is accompanied by the production of from and inorganic phosphate by the action synthase (complex V) . The amount of produced depends on the molecule, which has been oxidized. molecules are produced by the oxidation of one molecule of . One molecule of , on oxidation, gives molecules.

Electron Transport System in Image
Q_6_3 ATP Molecules

Q: 7. Distinguish between the following:

(A) Aerobic respiration and Anaerobic respiration

(B) Glycolysis and Fermentation

(C) Glycolysis and Citric acid Cycle


(A) Aerobic respiration and Anaerobic respiration

Q_7_A_Table of Aerobic and Anaerobic Respiration
Aerobic respirationAnaerobic respiration
1.It uses oxygen for deriving energy.1.It occurs in the absence of oxygen.
2.It occurs in cytoplasm and mitochondria.2.It occurs in cytoplasm.
3.The end products of aerobic respiration are carbon dioxide and water.3.The end products of fermentation

are ethyl alcohol and carbon-dioxide.

4.Complete oxidation of respiratory substrate takes place.4.Incomplete oxidation of respiratory substrate takes place.
5. ATP molecules are produced.5.Only ATP molecules are produced.
The Aerobic Respiration
The Anaerobic Respiration

(B) Glycolysis and Fermentation

Q_7_B_Table of Glycolysis and Fermentation
1.Glycolysis occurs during aerobic and anaerobic respiration1.Fermentation is a type of anaerobic


2.Pyruvic acid is produced as its end product.2.Ethanol or lactic acid is produced as its end product.

(C) Glycolysis and citric acid cycle

Q_7_C_Image of Glycolysis and Citric Acid Cycle
GlycolysisCitric acid cycle (Krebs Cycle)
1.It is a linear pathway.1.It is a cyclic pathway.
2.It occurs in the cell cytoplasm.2.It occurs in the mitochondrial matrix.
3.It occurs in both aerobic and anaerobic respiration.3.It occurs in aerobic respiration.
4.One glucose molecule breaks down to generate and ATP molecules.4.It produces , and 2 ATP molecules on breakdown of two

acetyl-coA molecules.

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