as plantas: raiz
TRANSCRIPT
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AS PLANTASAS PLANTASA raízA raíz
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Parte da planta, case sempre subterránea.Formada por-raíces principais e secundarias-pelos absorbentes
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Zona de pelos absorbentes Os pelos absorbentes aumentan a superficie das membranas celulares para facilitar e activar a ósmose (movemento de líquidos a través de membranas situadas entre disolucións con distinto grao de concentración).
Floema
Xilema
Punto de crecemento Parte final da raíz onde as células se reproducen moi activamente.
Zona de alargamentoNesta zona as células en contacto coa auga alónganse e fan que a raíz medre cara abaixo.
Cofia Parte engrosada da punta das raíces formada por unhas células endurecidas que protexen a zona de crecemento.
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CLASES DE RAÍCES SEGUNDO A ESTRUTURA
FASCICULADAVarias raíces iguais.
TÍPICAUnha raíz principal da que saen outras máis pequenas.
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raíz típica
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raíz típica
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Raíz napiforme: típica coa parte central moi grosa para almacenar substancias.
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raíz fasciculada
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raíz fasciculada
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Raíz tuberosa: fasciculada coas raíces engrosadas para almacenar substancias.
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AÉREAS: fora da terra. Distintas funcións-Suxección-Absorción de aire-Absorción de humidade-Absorción de nutrintes (plantas parásitas)
CLASES DE RAÍCES SEGUNDO A SITUACIÓN
SUBTERRÁNEASDebaixo da terra, medran en sentido contrario ao talo.
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Raíz aérea de suxección
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Raíz aérea de suxección
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Raíz aérea de suxección
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Raíz aérea para absorber aire (neumatóforos)
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Raíz aérea para absorber humidade
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Raíz para a absorción de nutrintes (plantas parásitas)
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Raíz para a absorción de nutrintes (plantas parásitas)
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As raíces das plantas suxeitan o solo e protéxeno da erosión.
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ALGUNHAS RAÍCES ÚTILES
xinseng
nabos
rábano
remolachacenoira
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batata (boniato)
iuca (mandioca)
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Montaxe: Adela LeiroFotos: Adela Leiro, Mon Daporta, InternetDebuxos: Mon Daporta