Name the final product$(s)$ obtained in anaerobic respiration if it takes place in a plant (like yeast).

During respiration,exchange of gases takes place in:

If a person holds their breath after expiration for about $25 \ s$, would there be an occurrence of any exchange of respiratory gases in the lungs during this period? Explain.

Lack of oxygen in muscles often leads to cramps in the legs of sprinters. This is due to the conversion of pyruvate to:

Which of the following statement$(s)$ is (are) correct?
$(i)$ Pyruvate can be converted into ethanol and carbon dioxide by yeast.
$(ii)$ Fermentation takes place in aerobic bacteria.
$(iii)$ Fermentation takes place in mitochondria.
$(iv)$ Fermentation is a form of anaerobic respiration.

Give one reason why multicellular organisms require special organs for the exchange of gases between their body and their environment.