Question

Describe the exchange of gases in unicellular organisms

Answer 1

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Gas exchange in unicellular and multicellular organisms. ... They are larger organisms made up of many cells aggregated together. They have a smaller surface area to volume ratio that unicellular organisms and so diffusion across their body surfaces alone is not enough to satisfy their respiratory needs.

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Answer 2

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In Lower organisms like Protozoans (eg:- Amoeba, Paramecium, etc), sponges (e.g. Sycon) and Coelenterates (e.g. Hydra), there are no special structures for Respiration.

In these animal groups, every cell of body is in direct contact with water so there is direct exchange between oxygen of surrounding water and carbon dioxide of body cells, demonstrating the principle of diffusion. This is called Body-surface Respiration.

Inside the cells , oxygen is used in the oxidation of glucose inside the mitochondria to produce CO2, water and energy-rich molecules.