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SVT 5 plantes transp

SVT 5eme plantes transport de sucre et eau

Qu’est ce que la sève brute? de l’eau
Qu’est ce que la sève élaborée? de l’eau et du sucre
Quel tube aide au transport de l’eau/sève brute? le xylème
Quel tube aide au transport du sucre/séve élaborée? le phloème
Quelles sont les adaptations des xylèmes? cellules mortes qui forment de long tubes creux ce qui encourage le flot de l’eau; les parois sont faits de lignine, ce qui les rend très solide
CHALLENGE Quelles sont les adaptations des phloèmes? les pores; les cellules compagnons ont beaucoup de mitochondrie pour aider le mouvement du sucre
Par quel mecanisme l’eau passe-t-elle des poils absorbants aux xylèmes? par osmose