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Samenvatting Wero bomen en heesters

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WERO bomen en heesters gemakkelijk te leren omdat alles is in oefenvragen opgesteld

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WERO: bomen en heesters

Wat zijn de delen van een boom + functie?
Wortels:
 Zijn sterk vertakt
Functie
 Bevestiging v/d boom in bodem
 Opnemen water & mineralen
Stam:
 Stengel v/d plant
 Bij bomen & heesters -> houtachtig & stevig
Functie
 Ondersteuning: transport, water, mineralen & suikers

Kruin:
 Opgebouwd uit sterk vertakte takken & twijgen met
bladeren
Functie:
 Fotosynthese
 Ademhaling
 Verdamping
Eindknoppen -> lengtegroei tak
Okselknoppen -> breedtegroei kruin

, Dwarse doorsnede
Toont: schors, bast, hout met jaarringen, merg en mergstralen
Diktegroei:
 Tussen hout & bast -> cambium (belangrijke laag)
 Cambium -> deling weefsel ene zijde hout vormt & andere
bastweefsel
 Zorgt ervoor dat boom elk jaar dikker word
Hout en jaarringen:
 In hout gebeurd transport water (wortels -> bladeren)
 Door houtvaten 2e functie -> stevigheid verlenen stam
(opgebouwd uit cellen met verstevigde wand & grote porie)
 Cellen houtvaten opgebouwd worden komt van cambium
 Ontstaan jaarringen: van voorjaarshout naar zomerhout
 Oudste delen van hout -> kernhout/spinthout
 Stevigheid & geen transport van water & mineralen

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December 26, 2019
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