The discharged trichocysts serve for anchoring or defence or it may be a reaction to injury. The latter opens into the endoplasm. Undigested food is passed out through cytopyge. Paramecium caudatum contains a single large macronucleus and one small micronucleus.
Paramecium aurelia has one macronucleus and two micronuclei. Paramecium contains two contractile vacuoles surrounded by 5 to 12 radial feeding canals. The food vacuoles are meant for intracellular digestion.
Both asexual and sexual reproductions are found in Paramecium. Asexual reproduction occurs through transverse binary fission.
Various methods of sexual reproduction in Paramecium are conjugation, autogamy — it corresponds to self-fertilization, endomixis — it corresponds to parthenogenesis, cytogamy — it shows the characters of both conjugation and autogamy, and hemixis — only the macronucleus takes part in hemixis. In hemixis the macronucleus first breaks into a few irregular pieces; later some pieces reunite to form the macronucleus. Remaining pieces disintegrate in the endoplasm. This ciliate lives as an endoparasite in large intestine of human beings.
It causes ciliary dysentery which is characterized by diarrhea and ulceration of large intestine. The transmission of parasite is through cysts in contaminated food or water. Carbarsone, Aureomycin and Terramycin are ideal medicine for curing the ciliary dysentery. Top Menu BiologyDiscussion. Difference between Gymnosperms and Angiosperms Plant Kingdom. Archaebacteria: Definition, Types and Uses.
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One is a small diploid micronucleus that is involved in reproduction and the other is a larger polypolid macronucleus that is involved in cell regulation.
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