Graine Flashcards

1
Q

Graine

A

Assure reproduction

3 parties: embryon, tégument, cotylédon

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2
Q

Embryons graine

A

Partie devient plante

  • Radicule: forme embryonnaire de la racine
  • Gemmule: bourgeon donne premières feuilles
  • Tigelle: future tige
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3
Q

Tegument graine

A

Enveloppe protege

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4
Q

Cotylédon

A

reserves nourriture pour germination et croissance nouvelle plante

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5
Q

Fonctions graine

A

Germination

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6
Q

Conditions requises germination

A

Besoin eau
Besoin oxygène
Temperature et luminosity

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7
Q

Besoin eau graine

A

Sol doit etre humide pour pouvoir réhydraté la graine qui est seche.

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8
Q

Besoin oxygène graine

A

Graine doit etre en contact avec air pour avoir oxygène et assure la respiration cellulaire.

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9
Q

Temperature et luminosité ideal

A

Sol doit avoir température environ 20°C et périodes ensoleillement pour photosynthèse.

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