How does gaseous exchange take place in $Amoeba$?

State whether the following statement is true or false: During respiration, plants take in $CO_2$ and release $O_2$.

Which of the following are the respiratory organs of a plant?

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.

In which of the following organisms does gaseous exchange during respiration not take place through the cell membrane or skin?

Explain how it would benefit deep-sea divers if humans also had gills.