Distinguish between 1) Nutrition in Amoeba and Paramecium.
Answers
1. doesnt have specific organisation. i.e can catch food from any side.
2. catches food with the help of finger like appandages called pseudopodia.
In Paramacieum-
1. specific organisation i.e can catch food from one spot called oral groove.
2. catches food with the help of hair like cilia.
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There are two very simple animals namely amoeba and paramecium. They are made up of single cell and so known as unicellular animals. So, all the 5 processes of nutrition are performed by single cell. The mode of nutrition in amoeba is holozoic. They eat tiny or microscopic plants and animals as food which floats in water in which it lives. The process of obtaining food by Amoeba is called phagocytosis means cell feeding.
(i) Ingestion: Amoeba has no mouth so food is ingested by using pseudopodia. When food comes near amoeba, then amoeba ingests this food particle by forming temporary finger like projections called pseudopodia around it. And the engulfed food with water formed a food vacuole which is considered as ‘ Temporary stomach’ of Amoeba.
(ii) Digestion: In Amoeba food is digested in the food vacuole by digestive enzymes. These enzymes break down the food in to small and soluble molecules by chemical reactions.
(iii) Absorption: The digested food present in the food vacuole of Amoeba is absorbed directly in to the cytoplasm by diffusion. Due to the presence of one cell, blood is not required to carry the digested food. The food just spreads out from the food vacuole in to the whole cell of Amoeba and finally food vacuole disappears.
(iv) Assimilation: A part of the absorbed food is used to obtain energy through respiration and the remaining part of the food leads to the growth in Amoeba. And then amoeba can reproduce by dividing in to two daughter cells.
(v) Egestion: Amoeba has no fixed place for removing the undigested part of food.When a considerable amount of undigested food collects inside amoeba, then its cell membrane suddenly ruptures at any place and undigested food is thrown out of the body of Amoeba.
In case of Paramecium, hair like structures called cilia helps to sweep the food particles from water and put them in to mouth. This step is known as ingestion which is followed by other steps such as digestion, absorption etc.
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