Question

Anaerobic respiration occurs in:
A. Mitochondria
B. Nucleus
C. Cytoplasm
D. Ribosome

Answer 1

Hint: Incomplete oxidation of glucose and loss or absence of the oxygen in the respiration system and also less amount of carbon dioxide, ethyl alcohol. In this process glycolysis serves as energy production to the cells that cannot be able to produce adequate energy through the process of oxidative phosphorylation.

Complete answer:
 It is a very fast process but creates toxic products like carbon dioxide and ethyl alcohol. It is present in the prokaryotic cells and eukaryotic cells but sometimes absent in the eukaryotic cells but always present in the prokaryotic cells. In eukaryotic the lactic acids produced by anaerobic system. There are two types of fermentation a) lactic acid b) ethanol. The process of fermentation of lactic acid and ethanol occurs in the cytoplasm. The three main steps in the anaerobic system 1) glycolysis 2) decarboxylation 3) reduction (GDR).
Anaerobic respiration is always present inside the mitochondria that are energy sources of ATP (adenosine triphosphate). In anaerobic metabolism glycolysis generates only 4 ATP. Further fermentation generates two more ATP so alternatives generate maximum 6 to 8 ATP. In the anaerobic process mature erythrocytes (present in blood) do not possess mitochondria and play a role in the production of anaerobic glycolysis for ATP.

Therefore the correct answer is (C) Cytoplasm.

Note: Anaerobic respiration produces more and more energy but it is possible only with the help of the present required amount of oxygen. In anaerobic respiration the cells break down the sugar molecules and regenerate the energy in the absence of the oxygen. And obtained oxygen has the most efficient electron acceptor present for respiration due to the presence of high affinity for electrons.