as plantas: follas
TRANSCRIPT
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AS PLANTASAS PLANTASAs follas
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A FOLLA é unha estrutura, xeralmente laminar de formas e tamaños moi variados, con células dotadas de cloroplastos.
A maioría das follas son verdes.
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LIMBO
PECIOLO
xema
cara
envés
nervos
A folla é a encargada da respiración e da fotosíntese (nutrición) da planta.
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CARA ENVÉS
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cloroplastos
estomas
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CLASES DE FOLLASSEGUNDO A ESTRUTURA
SIMPLESLimbo nunha soa peza
COMPOSTAS limbo formado por varias pezas
(foliolos)
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agulla
FORMAS DO LIMBOFOLLAS SIMPLES
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filiforme
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linear
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lanceolada
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falciforme
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redonda
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elíptica
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oval
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romboide
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abano
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irregulares
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fendida
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palmeada
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palmeada
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palmeada
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escama
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ril
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poligonal
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FOLLAS COMPOSTAS
PINNADAS
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imparipinnadas
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paripinnadas
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paripinnadas
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Compostas-dobles
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COMPOSTAS PALMEADAS
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BEIRAS
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Beira enteira
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Beira serrada Beira dentada
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Beira lobulada
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TIPOS DE NERVIACIÓN
pinnada
palmeada
paralela
radial
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ASENTAMENTO NO TALO
peltadacon peciolo sen peciolo
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abrazadora
envainadora
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DISTRIBUCIÓN NO TALO
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FOLLAS ESPECIAIS
gabiáns
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Órganosde flotación
estoloníferas
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Proteción contra a luz e a seca:pelos, cubertas coirentas…
Espiñas,Pelos…
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pelos urticantes
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Follas transformadas en espiñas
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brácteas
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filodio
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Follas carnosas: almacén de auga
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A folla máis grande: Ra phia fa rinife ra (Madagascar): 20 m.
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CLASES DE FOLLASSEGUNDO A SÚA DURACIÓN
PERSISTENTES CAEDIZAS
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Alimento leitugas, repolos, acelgas, berros, grelos, espinacas, pirixel, te, ...
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Febras palmeiras
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Varios construción, cubertas, cestería, decoración...
ALGÚNS USOS DAS FOLLAS
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Montaxe: Adela LeiroFotos: Adela Leiro, InternetDebuxos: Mon Daporta