Single celled organisms viz. Amoeba takes up the food with the help of special extensions (pseudopodia) present on its entire body surface. These pseudopodia forms food vesicle upon fusion with food (Fig 14). Similarly, Paramecium takes the help of cilia on its body surface for the update of the food. The process of uptake of food by the living organisms becomes more complicated in multicellular organisms.
Fig 14 shows the process of uptake of food by Amoeba
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