πŸ”¬ Unicellular nutrition in Amoeba and multicellular nutrition in Hydra


Unicellular nutrition
Multicellular nutrition


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Unicellular nutrition

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Single cells such as Amoeba absorb food particles from their environment and digest them directly inside themselves (their single cell).

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There is no designated area of the cell where phagocytosis takes place as the food gets absorbed. Pseudopods can extend out of the cell to aid with capturing the food.

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During absorption, vesicles within the plasma membrane of Amoeba can be formed to imbibe the food particles.

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Digestive enzymes inside the phagolysosome break down the food into smaller particles, and excretory byproducts are released back into the environment.

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Multicellular nutrition

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Once an organism is multicellular, it can concoct actual structures dedicated to digestion. The most basic such structures involve simple,Β undifferentiated sac-like gutsΒ with just aΒ single opening, while more complex ones are tubes withΒ two openingsΒ (one for ingestion and one for egestion; so the nutrients in food and the waste products don’t mix together) andΒ separate regions for digesting different types of food substance…