Question on: JAMB Biology - 2024

Gaseous exchange occurs directly through the plasma membrane in single-celled organisms and simple multicellular organisms.* Paramecium is a single-celled organism, and therefore it relies on diffusion across its plasma membrane for gas exchange.* Hydra, while multicellular, has a simple body plan where all cells are close to the external environment, and gas exchange occurs directly via diffusion.* Flatworms and Earthworms have more complex body plans and specialized respiratory structures (or, in the case of earthworms, their skin) for gas exchange, rather than relying solely on the plasma membrane.

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