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Summary Lewenswetenskappe Gr. 10 Opsommings - Plantweefsel
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- Life Sciences
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- 10
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By: lindienortier • 1 year ago
By: annelizeneethling • 2 year ago
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LEWENSWETENSKAPPE GRAAD 10: KWARTAAL 2 OPSOMMINGSONDERWERP 1:
PLANTWEEFSEL
, LEWENSWETENSKAPPE GRAAD 10: OPSOMMINGS
1. MERISTEMATIESE WEEFSEL
HOOFGROEPE BASIESE STRUKTUUR FUNKSIES DIAGRAM
Apikale meristeem • Klein selle • Maak primêre groei
• Groepies selle naby • Dun selwande (lengtegroei) moontlik.
wortelpunte en –stingels • Geen vakuole
• Verantwoordelik vir • Kubusvormige selle
lengtegroei. • Groot selkerne
• Geen intersellulêre
lugruimtes nie
Laterale meristeem • Dieselfde as apikale • Maak sekondêre groei
• Word tussen xileem en meristeem, behalwe dat (diktegroei) moontlik.
floeëm in vaatbuntdels die selle platter en
aangetref = kambium. effens verleng is.
• Verantwoordelik vir
diktegroei.
1
, LEWENSWETENSKAPPE GRAAD 10: OPSOMMINGS
2. PERMANENTE WEEFSEL
HOOFGROEPE BASIESE STRUKTUUR FUNKSIES DIAGRAM
1. Epidermis • Epidermisselle is baksteenvormig in • Beskerm weefsels teen
Vorm buitelaag om ‘n enkellaag gerangskik beserings en uitdroging.
wortels, stingels en • Deurskynende selle • Kutikula voorkom vogverlies.
blare. • Besit geen chloroplaste nie. • Epidermis laat sonlig deur vir
• Geen intersellulêre lugruimtes. fotosintese.
• Blare en stingels is met ‘n • Wortelhare absorbeer water
wasagtige laag bedek = kutikula. en minerale uit grond.
• Epidermisselle wysig tot wortelhare • Sluitselle beheer oop- en
of sluitselle van huidmondjie. toegaan van huidmondjie vir
gaswisseling.
2. Parenchiem • Groot selle met dun selwande. • Berg voedsel en water.
Volopste plantweefsel. • Groot intersellulêre lugruimtes. • Vervaardig koolhidrate vir
• Selle het groot vakuole. fotosintese.
• Stingel- en blaarparenchiem besit • Intersellulêre lugruimtes laat
chloroplaste = chlorenchiem. gaswisseling toe.
• Vakuole verleen stewigheid
a.g.v. turgordruk.
2
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