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PART 3 ANIMALS EXAMEN BIOLOGIA PRIMER QUATRIMESTRE
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TEMA 8.3: ÒRGANS VEGETATIUS I REPRODUCTORS DE LES PLANTES1. INTRODUCCIÓ
Nota: en les angiospermes l’òrgan reproductor és la flor i el fruit.
2. L’ARREL
NOTA 1: dicotiledònies: origen embrionari, l’arrel es de tipus pivotant o axonomorf, hi
ha una arrel principal amb + importància
,Nota 2: monocotiledònies: origen caulinar, l’arrel es de tipus en cabellera o fasciculat,
hi ha moltes arrels que neixen des de la tija que tenen la mateixa tija i a més a més
tenen la mateixa llargada o pareguda i mateixes funcions.
Nota 3: diferencies: l'embrió te tres parts: a la figura.
en les primeres la llavor germina ´l'arrel es la radicula de la llavor es el primer que surt
en les segones la llavor germina: la radicula en aquest cas mor i es substitueix per
moltes
2.1. L’ARREL: ANATOMIA PRIMÀRIA
, Nota: només la dicotiledònia te anatomia secundària
3. LA TIJA
3.1. FUNCIONS:
- Sosteniment
- Conducció de substancies
- Reserva de substancies
3.2. PARTS:
- Borrons apicals i axil·lars
- Nusos (dins dels quals hi ha els meristemes apicals)
- Entrenusos ( on es disposen els òrgans folials i la distància entre nus i nus
s’anomena entrenus )
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