Question

During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the(a) cytoplasm(b) chloroplast(c) mitochondria(d) golgi bodyNCERT Class XScience - Exemplar ProblemsChapter_Life Processes

Answer 1

Answer:

Cytoplasm.

In the absence or deficiency of oxygen, cells convert pyruvic acid in to lactic acid by the reduction of pyruvate in to lactate by the production of NAD+ from NADPH. Enzyme that help in the conversion of pyruvic acid in to lactic acid is lactate dehydrogenase. This process is known as anerobic glycolysis.

Answer 2

Answer:

Cytoplasm

Explanation:

Part 1 -  Definition - Anaerobic respiration

Anaerobic means without air (an means without).  

Anaerobic respiration is the partial breakdown of glucose into acid or alcohol along with carbon dioxide in the absence of oxygen.

Part 2 - Anaerobic respiration in muscles

During vigorous exercise, our heart and lungs could not get sufficient oxygen for our muscles in order for them to respire aerobically.

In this case, muscles carry out anaerobic respiration.

In this process, glucose is partially oxidized to pyruvate, which further converts into form lactic acids in muscles.

The reaction proceeds as follows:-

Glucose   →    Lactic acid + Energy

Part 3 - Location

Anaerobic respiration is divided into two parts: glycolysis and fermentation.

Both occur in the cytoplasm of a muscle cell.

Part 4 - Conclusion

Usually, the pyruvate formed from the glycolysis enters the Kreb's cycle as acetyl coenzyme A in the mitochondrial matrix and generates a pool of chemical energy (ATP, NADH and FADH).

​One of the alternate fates of pyruvic acid in cellular respiration is that it can be converted into lactic acid. This commonly occurs in the cytoplasm of muscular tissue under strenuous conditions.

Final step: During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the cytoplasm.