Download - Bg 10 hormonas vegetais
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Biologia e Geologia 10º
Hormonas vegetais
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Nu
no C
orr
eia
20
15
2
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3
Nu
no C
orr
eia
20
15
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Como é que a planta reage aos estímulos do ambiente?
Nu
no C
orr
eia
20
15
4
Tigmotropismo na videira
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Nu
no C
orr
eia
20
15
5
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Resposta das plantas a estímulos ambientais
Nuno Correia 20156
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Todas as reacções implicam a ação de um conjunto de
hormonas vegetais, cujos processos de actuação ainda não são
totalmente conhecidos.
Nuno Correia 20157
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Caules crescem tendencialmente à luz.
Raízes em sentido inverso aos caules.
Floração em períodos de iluminação adequados a cada planta
As sementes germinam em determinadas condições de temperatura e humidade
Todo o desenvolvimento vegetal depende de estímulos externos à planta
Nu
no C
orr
eia
20
15
8
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Tropismo
Nu
no C
orr
eia
20
15
9
Crescimento direcional de uma planta em resposta a um estímulo externo.
Tropismo – Positivo
Tropismo - Negativo
Fototropismo
Gravitropismo
Tigmotropismo
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Nuno Correia 201510
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Nuno Correia 201511
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Nu
no C
orr
eia
20
15
12
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Hormonas vegetais
Nu
no C
orr
eia
20
15
13
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Nu
no C
orr
eia
20
15
14
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Nuno Correia 201515
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Nu
no C
orr
eia
20
15
16
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Nuno Correia 201517
Concentração de auxina
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Nuno Correia 2015
18
Concentração de auxina
Baixa
concentração de auxina nas
zonas apicais
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Nu
no C
orr
eia
20
15
19
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Nu
no C
orr
eia
20
15
20
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Nuno Correia 201521
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22
Nu
no C
orr
eia
20
15
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Nuno Correia 201523
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Porque caem as folhas das árvores?
24
Nu
no C
orr
eia
20
15
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25
Nu
no C
orr
eia
20
15
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Amadurecimento do frutos
Nu
no C
orr
eia
20
15
26