tissus Flashcards

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1
Q

tissus conducteurs

A

xylème
phloème

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2
Q

xylème

A

transporte sève brute

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3
Q

xylème formé de

A

éléments de vaisseau
trachéides
formés de sclérenchyme

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4
Q

éléments de vaisseaux

A

grosses
plaques avec perforations
+ large
+ rapide

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5
Q

trachéides

A

petites pores
mince
lent

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6
Q

phloème

A

transporte sève élaborée

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7
Q

phloème composé de

A

éléments de tube criblé
cellules compagnes

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8
Q

éléments de tube criblé

A

mort programée à mi de chemin
pas de noyau peu organites
paroi primaires

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9
Q

cellules compagnes

A

aident tube criblé
plasmodesmes: pores pour communication

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10
Q

types de tissus

A

revêtement
conducteurs
fondamentaux

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11
Q

revêtement

A

couche protectrice externe = épiderme
* couche cireuse = cuticule
* dicotylédones âgées – épiderme = périderme

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12
Q

conducteurs

A

xylème et phloème
* racines : 1 cylindre conducteur central (stèle)
* feuilles et les tiges : ++++ faisceaux conducteurs (libéroligneux)

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13
Q

fondamentaux

A
  • (collenchyme et sclérenchyme), (parenchyme), (méristème) et de sécrétion
  • Si centre stèle = moelle
    si périphérie = cortex (ou écorce)
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