Question 1

Which of the following is the first pathway of respiration shared by both aerobic and anaerobic respiration?

Accepted Answer

Glycolysis is the first stage of cellular respiration that occurs in the cytoplasm of all living cells. It is common to both aerobic and anaerobic respiration and does not require oxygen.

Question 2

Where does the process of glycolysis take place in a cell?

Accepted Answer

Glycolysis takes place in the cytoplasm of the cell, where glucose is partially broken down into two molecules of pyruvic acid.

Question 3

The net gain of ATP molecules during glycolysis from one glucose molecule is:

Accepted Answer

During glycolysis, 4 ATP molecules are produced and 2 ATP molecules are consumed, resulting in a net gain of 2 ATP molecules.

Question 4

In anaerobic respiration (fermentation) by yeast, glucose is converted into:

Accepted Answer

In yeast, during fermentation, pyruvic acid is converted into carbon dioxide and ethanol, along with the release of a small amount of energy.

Question 5

Which enzyme converts glucose into glucose-6-phosphate during the first step of glycolysis?

Accepted Answer

Hexokinase is the enzyme that catalyzes the phosphorylation of glucose to glucose-6-phosphate using one ATP molecule in the first step of glycolysis.

Respiration in Plants — CBSE Class 11 Biology Important Questions & Revision Notes