EVERYDAY SCIENCE

Detailed explanation-1: -Respiration in the complete absence of oxygen occurs in yeast cells, where glucose is broken down to form ethanol, carbon dioxide, and energy. Anaerobic respiration takes place in human muscle cells, where the breakdown of glucose produces lactic acid and energy.

Detailed explanation-2: -Lactic acid is the waste product produced during anaerobic respiration. Running fast can lead to a build-up of lactic acid in your muscles, causing cramp.

Detailed explanation-3: -Lactic acid is an organic compound produced via fermentation by different microorganisms that are able to use different carbohydrate sources. Lactic acid bacteria are the main bacteria used to produce lactic acid and among these, Lactobacillus spp. have been showing interesting fermentation capacities.

Detailed explanation-4: -Reason (R): They produce lactic acid anaerobically. Therefore, the muscles respire anaerobically and produce lactic acid from glucose, but ONLY when oxygen is lacking. Hence, The assertion is True.

Detailed explanation-5: -In this type of anaerobic process, glucose is broken into two molecules of lactic acid to form two ATPs molecules.