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Organisms exchange substances with their environment (AQA AS
Biology) PART 2 of 5 TOPICS

Gas exchange:
Gas exchange is when oxygen is reached to the respiring cells and waste products are removed.

Single celled organisms such as amoeba have a thin membrane that is moist.

Exchange surfaces have a large…

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Insects: These organisms have a tracheal system which is similar to plants. Oxygen diffuses in
through the spiracles into the tracheae and then into the trachieoles to the respiring cells.
Waste gases then exit through the spiracles.

Xeromorphic plants such as xerophytes reduce water loss as they have a thicker…


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