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Samenvatting Theorie Cellen en Weeftsels plantkunde $3.19
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Samenvatting Theorie Cellen en Weeftsels plantkunde

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Dit is de te kennen theorie over cellen en weefsels voor het examen, aan de hand van de powerpoints en de curcus (Ik was geslaagd voor dit vak door mijn samenvattingen en de powerpoints voor het praktijk gedeelte)

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  • January 8, 2025
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  • 2023/2024
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Plantkunde

Zaadloze vasculaire planten: cellen en weefsels

De weefsels kunnen ingedeeld worden in 2 grote categorieën
 Meristematische weefsels (meristemen)
Permanente weefsels

1. Meristemen
- Eerste gevormde weefsel
- Delingsweefsel
- Differentiatie in verschillende weefsel
 Taakverdeling
 Vorming permanent weefsel
- Vorming van bepaalde zones met continue celdeling (handhaven meristemen)
- We hebben een primair en een secundair meristeem
 Apicale meristemen: knopvorming, bladvorming, apicale groei
 Laterale meristemen: secundaire diktegroei
 Intercalaire meristemen: lengtegroei (bij bv. Grassen)
2. Permanente weefsels
- Grondweefsel
1) Parenchym
 Minst gespecialiseerd
 Vormt de grondmassa waarin andere weefsels liggen
 Aansluitende complexen of kleine groepjes
 Basisprocessen: fotosynthese, assimilatie, dissimilatie en opslag
 Vaak isodiametrische vorm
 Geen secundaire wand
 Levende protoplast
 Grote centrale vacuole
 Verschillende types parenchym
2) Collenchym
 Verwant aan parenchym
 Levende cellen met complexe protoplast (+ chloroplasten)
 Langgerekte cellen met verdikte wanden
 Perifere ligging
 Verschillende types collenchym
3) Sclerenchym
 Dikke secundaire wand
 Houtstof of lignine
 Volwassen cel = dood
 Steunende en beschermende functie
- Afsluitweefsel
1) Epidermis
 Is de buitenste cellaag van het primair plantenlichaam
 Aanpassing aan landleven: bescherming, beperking en controle transpiratie, regeling
van gaswisseling, fotosynthese, absorptie, perceptie prikkels (bv. plant die bij
aanraking zijn bladeren sluit)

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