Question

Anaerobic respiration of animals/humans produces

A. glucose and ${O_2}$ 

B. ${C_{{2_{_{}}}}}{H_5}OH$ and $C{O_2}$ 

C. lactic acid and water

D. $C{O_2}$ and ${H_2}O$ 

Answer 1

Hint: Cellular respiration that occurs in animals is mostly aerobic in nature. However, in stressful conditions, respiration turns anaerobic to fulfill the energy demands. End products of anaerobic respiration in animals are lactic acid and water whereas in plants they are alcohol and carbon dioxide.

Complete answer: 

Option A- glucose and ${O_2}$ 

Glucose reacts with molecular oxygen and produces carbon dioxide and water. The carbon atoms present in glucose are oxidized. Which means that they lose electrons and go to a higher oxidation state.

Option B- ${C_2}{H_5}OH$ and $C{O_2}$ 

${C_2}{H_5}OH$ is the formula for Ethanol. It is an organic chemical compound. $C{O_2}$ stands for carbon dioxide.

Option C- lactic acid and water

Anaerobic respiration is the process in which glucose breaks down without oxygen. During this chemical reaction, energy is transferred from glucose to the cell. Anaerobic respiration produces lactic acid, rather than carbon dioxide and water as its end products. Unfortunately, this leads to painful muscle cramps.

Option D- $C{O_2}$ and ${H_2}O$ 

Carbon dioxide is not produced in Anaerobic respiration. Anaerobic respiration produces lactic acid, rather than carbon dioxide and water.

So the answer is option (C), 'Lactic acid and water'. 

Note: Anaerobic respiration occurs in places where mitochondria are not present. In humans, red blood corpuscles do not possess mitochondria, that's why anaerobic respiration always happens in RBCs. It occurs in muscle cells, when there is a lack of oxygen, and results in the production of lactic acid.