Biology Class 11 NCERT Solutions: Chapter 14 Respiration in Plants Part 1

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Q: 1. Differentiate between

(A) Respiration and Combustion

(B) Glycolysis and Krebs' cycle

(C) Aerobic respiration and Fermentation

Answer:

(A) Respiration and Combustion

Respiration vs Combustion
Respiration vs Combustion

Respiration

Combustion

1.

It is a biochemical process.

1.

It is a physiochemical process.

2.

It occurs in the living cells.

2.

It does not occur in the 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

Glocolysis and Krebs Cycle
Glocolysis and Krebs Cycle

Glycolysis

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.

It generates and ATP molecules on the breakdown of one glucose molecule.

4.

It produces , , and ATP molecules on the breakdown of two molecules.

(C) Aerobic respiration and fermentation

Aerobic vs. Respiratation
Aerobic vs. Respiratation

Aerobic respiration

Fermentation

1.

Oxygen is used for deriving energy

1.

Occurs in the absence of oxygen

2.

Occurs in the cytoplasm and mitochondria

2.

Occurs in the cytoplasm

3.

End products are carbon dioxide and

water

3.

End products are ethyl alcohol and

carbon dioxide

4.

Complete oxidation of the respiratory substrate takes place

4.

Incomplete oxidation of the respiratory substrate takes place

5.

About ATP molecules are produced

5.

Only ATP molecules are produced

Q: 2. What are respiratory substrates? Name the most common respiratory substrate.

Answer

The compounds oxidised during the process of respiration are called respiratory substrates. Carbohydrates, especially glucose, act as respiratory substrates. Fats, proteins, and organic acids also act as respiratory substrates.

Image of the respiratory substrates

Image of the Respiratory Substrates

Image of the respiratory substrates

Q: 3. Give the schematic representation of glycolysis?

Answer:

Generating Energy

Generating Energy

Generating Energy

Q: 4. What are the main steps in aerobic respiration? Where does it take place?

Answer

The major steps in aerobic respiration and the sites where they occur are listed in the given table.

The major steps in aerobic respiration

The Major Steps in Aerobic Respiration

The major steps in aerobic respiration

Processes and Sites
Processes and Sites

Step

Site of Ocuurrence.

1.

Glycolysis

1.

Cytoplasm

2.

Krebs cycle

2.

Matrix of mitochondria

3.

Electron transport system

3.

Inner mitochondrial membrane

4.

Oxidative phosphorylation

4.

particles in the inner mitochondrial membrane