paramecium-2

paramecium-2 - binary fission. The ciliate stops moving (1)...

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Paramecium 2 Paramecium - Feeding Paramecium and amoeba both live in fresh water pools or ponds and feed on microscopic organisms such as bacteria and single-celled algae. Amoeba is able to take in food at almost any point on its surface. Paramecium, on the other hand, can take in food only at the cytostome. The cilia in the oral groove create a current of water which wafts the food organisms up to the cytostome where they are ingested in a food vacuole. This food vacuole then follows a specific route through the cytoplasm. On its travels, enzymes are secreted into the vacuole and the food is digested. The digested substances are then absorbed into the cytoplasm. Any undigested matter is expelled through the anal pore. This contrasts with amoeba which can expel the undigested remains from almost any point. Reproduction Paramecium reproduces, like amoeba, by
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Unformatted text preview: binary fission. The ciliate stops moving (1) and both mega- and micronucleus divide and move to opposite ends of the organism (2). The cytoplasm then divides at right angles to the long axis (3) and the daughter paramecia separate (4). Binary fission may take place 2 or 3 times each day. There is also a complex sexual process in which two paramecia join by their oral surfaces. The meganucleus breaks down and the micronucleus divides. One of the micronuclei of each individual crosses to the partner and fuses with the remaining micronucleus there. The partners then separate and reproduce by binary fission. food particles drawn into oral groove by ciliary current food ingested into a food vacuole undigested remains expelled circuit followed by food vacuoles slow movement Paramecium feeding 1 2 3 4 Binary fission D.G. Mackean...
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This note was uploaded on 11/29/2011 for the course BIO 218 taught by Professor Young during the Fall '11 term at BYU.

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