NCERT Class 11-Biology: Chapter –14 Respiration in Plants Part 3

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Question 2:

What is meant by the statement “aerobic respiration is more efficient.”?

Answer:

Aerobic respiration is more efficient because:

(i) Aerobic respiration produces more energy as compared to anaerobic respiration. It is a high energy yielding process.

(ii) Anaerobic respiration produces less energy as compared to anaerobic respiration.

Efficiency is attributed to the number of ATP produced from one molecule of glucose. In Aerobic respiration produces 38 ATP molecules from a single glucose molecule while anaerobic respiration produces only 2 ATP molecules from a single glucose molecule. Therefore, aerobic respiration is more efficient than anaerobic respiration.

Question 3:

Pyruvic acid is the end product of glycolysis. What are the three metabolic fates of pyruvic acid under aerobic and anaerobic conditions? Write in the space provided in the diagram.

Under the Aerobic conditions

Under the Aerobic Conditions

Answer:

Under the Aerobic conditions, the metabolic product of pyruvic acid is Carbon Dioxide and Water, i.e., and .

Under the Anaerobic conditions (Hypoxia) in the skeletal muscles, the metabolic product of pyruvic acid is lactic acid.

Under the Anaerobic conditions in the anaerobic organism like yeast, the metabolic product of pyruvic acid is ethanol and carbon dioxide, i.e., and .

Under the Aerobic conditions

Under the Aerobic Conditions

Question 4:

The energy yield in terms of ATP is higher in aerobic respiration than during anaerobic respiration. Why is there anaerobic respiration even in organisms that live in aerobic condition like human beings and angiosperms?

Answer:

Anaerobic respiration occurs in organisms that live in aerobic condition like human beings when there is intensive exercise or stress on a muscle it leads to inadequate oxygen in the cells, the pyruvic acid gets reduced to lactic acid, and this is known as homolactic fermentation. In angiosperms, the germination of seeds leads to anaerobic respiration for releasing the energy for the seedling to emerge from the soil.

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