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lunes, 3 de mayo de 2010

Las partes de las plantas


La raíz es el órgano que fija la planta al suelo .

Por la raíz se alimenta la planta absorbiendo del suelo el agua y los minerales.

La raíz crece dentro de la tierra.

La raíz sirve de medicina o de alimento.

PARTES DE LA RAÍZ

Las partes de la raíz son : La zona terminal o pilorriza, la zona de crecimiento y alargamiento, la zona pilifera, la zona de ramificacion y el cuello.

LA ZONA TERMINAL: Es muy resistente y dura; sirve para la penetracion de la raíz en el suelo. También se la conoce como cofia o caliptra

LA ZONA DE CRECIMIENTO: Formado por células que se reproducen constantemente. Estas células forman el tejido llamado meristemo primario.

LA ZONA PILIFERA: Con abundantes pelos radicales. Estos pelos absorben el agua y las substancias minerales.

LA ZONA DE RAMIFICACION: En la que se distingue la RAÍZ PRINCIPAL y las raíces secundarias.


EL CUELLO: Es donde la raíz se une con el tallo.

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Publicado por Simei Tavera en 11:35
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