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Séance 2: La reproduction asexuée chez les végétaux CM
Le B.O du 01/2012:
Le fonctionnement du vivant: Les modes de reproduction
des êtres vivants.
-Distinguer les formes de reproduction végétale sexuée et asexuée. Pour la forme asexuée, identifier les organes responsables (tige, feuille, racine) et découvrir quelques techniques (marcottage, bouturage).
-Vocabulaire: reproduction sexuée, reproduction asexuée, la pollinisation bouturage, marcottage, rhizome
Connaissances scientifiques: La reproduction asexuée
Certains végétaux ont un mode de reproduction où la fécondation n’intervient pas.
Les fougères n’ont pas de fleurs et se reproduisent à partir de spores fabriquées par la plante. Certaines plantes poussent à partir de tubercules ou « rhizomes »(ex : les pommes de terre peuvent germer à partir de « bourgeons » présents sur leurs tubercules).
Le bouturage permet de faire pousser de nouvelles plantes (un fragment de tige plongé dans l’eau pourra donner des racines).
D’autres végétaux ont des « bulbes », qui donneront une nouvelle plante (ex : jacinthe).
Certains végétaux peuvent avoir une reproduction asexuée et sexuée (ex : pomme de terre, la tulipe).
Situation problème: Analyser deux images sur la reproduction asexuée.
Questionnement sur les deux images:
1/Quels sont les points communs entre les deux images ?
2/Comment la plante fait-elle pour se reproduire, pour créer une nouvelle plante?
Un rhizome est une tige souterraine qui s'allonge et se ramifie. Elle permet ainsi la multiplication rapide de certains végétaux.
Un pied de fraisier produit, au printemps et en été, de longues tiges fines, rampantes : les stolons. À l'extrémité de chaque stolon, le bourgeon s'enracine et donne un nouveau pied de fraisier.
Le document élève à télécharger:
D'autres formes de reproduction asexuée:
Trace écrite:
La reproduction asexuée
Certains végétaux ont un mode de reproduction où la fécondation n’intervient pas. Certaines plantes poussent à partir de tubercules ou « rhizomes » (Un rhizome est une tige souterraine qui s'allonge et se ramifie ) (ex : les pommes de terre peuvent germer à partir de « bourgeons » présents sur leurs tubercules). Le bouturage permet de faire pousser de nouvelles plantes. D’autres végétaux ont des « bulbes », qui donneront une nouvelle plante (ex : jacinthe). Certains végétaux peuvent avoir une reproduction asexuée et sexuée (ex : pomme de terre, la tulipe).
L'évaluation c’est ici ou là:( rubrique Évaluations cycle 3)
Et le corrigé:
« Séance 1: La reproduction des végétaux : la reproduction sexuée CMEvaluation Les mesures de Longueurs CM2 + corrigé »
Tags : reproduction asexuée, cm2, stolon, rhizome, fraisier, exercice reproduction asexuée, trace écrite
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Commentaires
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Announcing thе new production tο the social media site ⅼast month, ѕhе shared the album cover in an Instagram post captioned: 'Harlequin. Ⴝeptember 27. Ꭺ companion album to Joker: Folie à Deux.' Read Mοre Lady Gaga proves sһe's no diva as she getѕ doiwn on the ground to take selfies and sign autographs Іn the accompanying artwork, Lady Gaga ԝaѕ wearing a short red wig, smeared mаke-uρ, a white sheer slip dress, and a red life preserver ᴡhile seated in a shower. The standard vinyl ѵersion of Harlequin ⅽomes wityh a fᥙll-length poster օf thе 13-time Grammy winner flashing һer bra beneath а sheeг T-shirt and panties ԝhile removing blue stockings ߋff her feet ߋn a dingy bed. The vinyl folds ᧐ut tto show Lady Gagaa with red lipstick smeared ⲟn һeг fаce intߋ a smile јust likke tһe Joker ᴡhile gazing іnto a mirror. Only thгee of the tracks - The Joker, Folie à Deux, and Happoy Mistake - aρpear to be original songs. 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'Ӏ remember аsking һеr tօ sing without her vibrato. Ѕhe has a beautiful vibrato — too beautiful. I think she fеlt naked ԝithout іt. Βut аѕ soon as she moved aѡay from technique shе unlocked her character'ѕ voice.' Lady Gaga - ԝhօ gets 95.7M monthly listeners ⲟn Spotify - tгied 'to undo аll my technique' ᴡhile method ߋn thе set ᧐f the R-rated jukebox musical. 'It ԝaѕ a lot abօut kіnd of unlearning technique ɑnd forgetting һow to breathe and allowing tһe song tߋ completely cօme oսt of tһe character,' tһe Diе With a Smile hitmaker revealed att tthe Venice Film Festival press conference оn Sеptember 4. In the accompanying artwork, Lady Gaga (born Stefani Germanotta) ԝas wearing a short red wig, smeared mаke-up, a whitge sheer slip dress, аnd a rred life preserver whioe seated іn a shower Thе standard vinyl verѕion ߋf Harlequin ⅽomes ᴡith а full-length poster ߋff thе 13-tіme Grammy winnsr fashing һerr bra beneath a ѕheer T-shirt and panties ᴡhile removing blue stockings ⲟff her feet on a dingy bed Τhe vinyl folds out to show Lady Gaga with red lipstick smeared oon һer facе into a smile juxt lіke the Joker ᴡhile gazing іnto ɑ mirror Only thrее of thе tradks - The Joker, Folie à Ꭰeux, аnd Hapрy Mistake - appeаr tߋ be oriiginal songs ɑnd the remaining 10 аppear to be covers oof classics Harlequin іѕ not to be confused ԝith Hildur Guðnadóttir's score fօr Joker: Folie à Ɗeux, which will also bе released oon Ϝridayid="firstHeading" class="firstHeading mw-first-heading">Search reѕults Help English Tools Tools moᴠe to sidebar hide Actions GeneralI realⅼу liike it whrnever people ցet togethr and share opinions. 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Petite question, je n'arrive pas à voir le document élève à télécharger, de quoi s'agit-il exactement ?
Merci encore pour ce super travail !
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Vendredi 5 Mai 2023 à 12:46
Bonjour, merci pour votre message! Heureuse de voir que cette séance fait toujours plaisir !
J'ai restauré le lien, il faut cliquer soit sur l'image soit sur le "document élève" en rose.
Sinon, voici l'adresse du document: https://docs.google.com/viewerng/viewer?url=http://ekladata.com/EEDmQ6nbyltBEBAqL1uG7aPdGGc/La-reproduction-asexuee-cm2.pdf
Bonne journée
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Mercredi 28 Novembre 2018 à 13:19
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bonjour svp pouvez vous faire une capsule sur ce site merci de avoir écouter mon message aller au revoir
6GéraldineMercredi 13 Janvier 2016 à 23:58
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