Schema d'observation d'une paramécie: légende


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Qu'est-ce que les paramécies?

Les paramécies (SVT) Les paramécies sont des organismes unicellulaires microscopiques.
. Elles appartiennent au groupe des protozoaires.
. La taille de la cellule varie entre 50 et 300 micromètres.
. Les paramécies utilisent des cils situés sur leur membrane pour se déplacer et se nourrir.

Quelle est la taille d'une paramécie?

La taille de la cellule varie de 0,1 à 0,3 mm de long suivant les espèces.
. La paramécie utilise des cils pour se déplacer et se nourrir (essentiellement de bactéries, par phagocytose).
. La ciliature somatique, qui recouvre la cellule et bat de façon synchronisée, lui permet de se déplacer.

Quel est le cycle de vie de la paramécie ?

Puis vient la néoformation des structures qui ne sont pas conservées lors de la division (le péristome et la deuxième vacuole pulsatile). 2) Reproduction sexuée La paramécie présente un cycle de vie de type diplobiontique (prédominance de la phase diploïde).
. Les individus sont diploïdes et la méiose survient juste avant la fécondation.










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