Summary Lewenswetenskappe Gr. 10 Opsommings - Anatomie van dikotiele plante (hoofstreke)
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Course
Life Sciences
Institution
10
In lyn met KABV/CAPS dokument.
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Verdere en gedetailleerde uitbreiding van die hoofstreke van 'n blaar (epidermis, korteks en vaatbundels)
Word met epidermislaag bedek. Twee tipes mesofilselle: • Bestaan uit xileem en floeëm wat
Beskerm onderliggende 1. Palissademesofilselle; aaneenlopend is met die xileem en
weefsels. 2. Sponsmesofilselle. floeëm van die wortel en stingel.
Selle besit nie chloroplaste nie • Water wat uit die grond geabsorbeer is
Deurskynend → lig na onderliggende 1. Palissademesofilselle: en langs die wortel- en stingelxileem tot
weefsels vir fotosintese. • Langwerpige, dunwandige in die blaarxileem vervoer is, beweeg
parenchiemselle; deur osmose tot in die mesofilselle waar
Kutikula: dit vir fotosintese gebruik word.
• Geleë onder die boonste epidermis.
Bedek epidermis → • Floeëm vervoer organiese
• Besit groot getalle chloroplaste →
verminder vogverlies. voedingstowwe na ander plantdele wat
absorbeer sonlig vir fotosintese.
Wasagtig;
• Regop gerangskik en styf gepak → tydens fotosintese in die blaar vervaardig
Deurskynend.
groter oppervlak aan sonlig blootgestel is.
Onderste epidermis: vir fotosintese.
Besit huidmondjies (stomata); • Dun selwande → vergemaklik diffusie
Sluitselle van huidmondjie → van gasse (CO₂ en O₂) in en uit die selle
verantwoordelik vir oop- en toegaan gedurende fotosintese en selrespirasie.
van huidmondjieporie.
2. Sponsmesofilselle:
Huidmondjies: • Onderste mesofillaag.
Verantwoordelik vir gaswisseling • Ronde, onreëlmatige losgepakte
(in en uit die blaar) gedurende: parenchiemselle.
Fotosintese → deur diffusie. • Besit groot intersellulêre lugruimtes.
Respirasie → deur diffusie. • Besit chloroplaste vir fotosintese.
Transpirasie → deur diffusie.
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