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GYMNOSPERMAS E
ANGIOSPERMAS
REPRODUÇÃO
Prof. Valdete
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O pinhão, semente da
araucária, árvore-
símbolo do Estado do
Paraná, é o principal
alimento da Gralha-azul
no inverno.
Vive na mata, gosta de se reunir
em bandos nos pinheiros, que
ajudam a disseminar, pelo ato de
desmanchar a pinha no galho,
comendo somente um ou outro
pinhão, enquanto a maioria das
sementes, cai no solo e germina.
A Gralha-azul tem o hábito de
enterrar pinhões
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Cycadophyta: Zamia e Cica
Ginkgophyta: Ginkgo biloba
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Coniferophyta: Pinus e Araucaria
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SEMENTES ESPERMATÓFITAS são as plantas que
possuem sementes.
INDEPENDÊNCIA DA ÁGUA PARA
REPRODUÇÃO.
sucesso evolutivo das espermatófitas é
atribuído À PROTEÇÃO que a semente
proporciona ao embrião.
EMBRIÃO, UM TECIDO DE RESERVA
(ENDOSPERMA) E TEGUMENTO
(CAMADA PROTETORA).
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PODE-SE OBSERVAR PINHA DE ARAUCÁRIA REPLETA DE PINHÕES
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o sistema mais
aceito no meio
acadêmico é
o APG
(“Angiosperm
Phylogeny
Group”),
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EUDICOTILEDÔNEAS Apresenta somente plantas que apresentem grão de
pólen triaperturado, característica derivada de um
ancestral comum, que torna o grupo monofilético
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Magnólia –
dicotiledônea basal
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MONOCOTILEDÔNEAS
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MONOCOTILEDÔNEAS
um cotilédone;
partes das flores são constituídas de três
elementos (flores trímeras);
pólen monoaperturado (apenas uma
abertura);
nervação das folhas paralelinérveas
(nervuras paralelas entre si);
os feixes vasculares estão dispostos no caule
de forma dispersa.
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pólen monoaperturado os feixes
vasculares estão
dispostos no
caule de forma
dispersa.
folhas paralelinérveas
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flores trímeras
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DICOTILEDÔNEAS
dois cotilédones;
partes das flores são constituídas de quatro
ou cinco elementos (flores tetrâmeras ou
pentâmeras);
pólen triaperturado (com três aberturas);
Enervação das folhas reticuladas
(formando uma rede);
os feixes vasculares estão dispostos no caule
em anel.
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flores tetrâmeras ou pentâmeras
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pólen triaperturado Enervação das folhas reticuladas
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CAULE DICOTILÊDÔNEA
CAULE
MONOCOTILEDÔNEA
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MASCULINO
FEMININO
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