adalberto angiospermas : monocotiledôneas e dicotiledôneas
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Angiospermas:
Monocotiledôneas e Dicotiledôneas
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Semente óvulo fecundado e desenvolvido (= embrião 2n) e endosperma (3n) em seu interior.
a quantidade de sementes num fruto depende da quantidade de óvulos que havia no ovário, além da presença de grãos de pólen para cada ovário.
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Embrião• Contido na semente
• Formado por: radícula, caulículo e cotilédone
• Monocotiledôneas: apresentam um cotilédone
• Dicotiledôneas: apresentam dois cotilédones
Monocotiledônea Dicotiledônea
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Dicotildôneas O material de reserva (endosperma) é transferido para os cotilédones
(folhas modificadas), que se hipertrofiam, ex : feijão, soja, amendoim, etc.
mamonadicotiledônea
endosperma
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MonocotiledôneasNo milho que é uma Monocotiledônea, o cotilédone não acumula nutrientes, que ficam no endosperma triplóide.
dico mono
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Critérios para diferenciação
Monocotiledôneas DicotiledôneasExemplos Arroz, Palmeira, Trigo, Beterraba, Café, Alface,
Banana, Milho, Orquídea, Eucalipto, Azaléia, Feijão,
Coqueiro, Abacaxi, Gramínea, Soja, Amendoim, Laranja,
Cana-de-açucar Roseira, Mamona
Raiz
Fasciculada Axial ou Pivotante
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Monocotiledôneas Dicotiledôneas
Folhas(nervuras)
ParalelinérveasReticulinérvea
Caule
Não formam troncos Podem formar troncos
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Monocotiledôneas Dicotiledôneas
Número de Verticilos
Florais
Estrutura Trímera
3, 6, 9, 12...
Estrutura Tetrâmera ou Pentâmera
4, 8, 12, 16... 5, 10, 15, 20...
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Grupos muito importantes ao homem :
Leguminosas
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Pé de feijão
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Gramíneas
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Mecanismo evolutivo em Metaphyta
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