Biology Class 11 NCERT Solutions: Chapter 14 Respiration in Plants Part 2

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

Answer:

Q 5 Image of Krebs Cycle

Q 5 Image of Krebs Cycle

Q 5 Image of Krebs Cycle

Q: 6. Explain ETS.

Answer

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

Electron Transport System in Image

Electron transport system in image

Q 6 Image of 3 ATP Molecules

Q 6 Image of 3 ATP Molecules

Q 6 Image of 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

Answer:

(A) Aerobic respiration and Anaerobic respiration

Q_7_A_Table of Aerobic and Anaerobic Respiration
Q_7_A_Table of Aerobic and Anaerobic Respiration

Aerobic respiration

Anaerobic 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.

6.

Image of the Aerobic respiration

Image of the Aerobic Respiration

Image of the Aerobic respiration

6.

Image of the Anaerobic respiration

Image of the Anaerobic Respiration

Image of the Anaerobic respiration

(B) Glycolysis and Fermentation

Q_7_B_Table of Glycolysis and Fermentation
Q_7_B_Table of Glycolysis and Fermentation

Glycolysis

Fermentation

1.

Glycolysis occurs during aerobic and anaerobic respiration

1.

Fermentation is a type of anaerobic

respiration.

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
Q_7_C_Image of Glycolysis and Citric Acid Cycle

Glycolysis

Citric 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.