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Lecture notes

PART 4 ANIMALS EXAMEN BIOLOGIA PRIMER QUATRIMESTRE

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August 25, 2022
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2022/2023
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TEMA 8.4. LES PLANTES: CLASSIFICACIÓ SISTEMÀTICA
1. INTRODUCCIÓ




2. PLANTES TERRESTRES O EMBRIÒFITS: 8 grans grups




Totes provenen d’un ancestre comú.

Els tres grans grups són: hepàtiques, molses típiques i antocerotes: les plantes vasculars es
divideixen en licopodis , cues de cavall, falgueres típiques. Finalment hi ha les plantes amb
llavor.

, 3. EVOLUCIÓ DELS GRANS GRUPS DE PLANTES TERRESTRES




4. LES MOLSES : 25.000 espècies
- Terrestres, petites, de llocs humits ( poiquilhidres)
- Fil·lidis, caulidis i rizoides ( anàlegs a fulles, tiges i rels de cormòfits)
- Paret cel·lular sense plasmodesmes
- Epidermis sense cutícula ni estomes
- Feixos conductors absents o molt senzills ( hidroides i leptoides)
- Sense elements de sosteniment ni lignina
- Rizoides fixadors, no absorbents
- Esporòfits (2n) paràsit del gametòfit (n) que es la generació dominant
- Ecològicament molt importants a les torberes ( 1% S total del planeta); indicadors de
contaminació
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