Gimnospermas 1
Transcript of Gimnospermas 1
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Fanerógamas
•Plantas com flores • A flor é uma importante adaptação para viver no
ambiente terrestre, pois o pólen (estrutura que carrega a célula que formará o gameta masculino) produzido pode ser transportado por vento, insetos, pássaros e outros animais.
•Pode ser dividida em dos grandes divisões:• Gimnospermas: plantas com flor e semente
• Angiospermas: plantas com flor, fruto e sementes
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Flor de angiospermas
Flor de gimnospermas - estróbilos
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O tubo polínico – é o gametófito masculino, local por onde se desloca o gameta masculino até o feminino sem a necessidade de água
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Gimnospermas
Traqueófitas
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Formação do grão de pólen
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Formação do saco embrionário
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Angiospermas
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Morfologia da flor
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Androceu
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Formação do Grão de Pólen
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Gineceu
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Formação do Óvulo
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Polinização
•A polinização é o transporte do grão-de- pólen da antera até ao estigma do carpelo
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Mecanismos que impedem a autopolinização
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Agentes polinizadores
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Fecundação
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