Pokreti biljaka
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Transcript of Pokreti biljaka
![Page 1: Pokreti biljaka](https://reader030.fdocuments.net/reader030/viewer/2022033009/55d76e99bb61ebd3638b46ea/html5/thumbnails/1.jpg)
Pokreti biljaka
![Page 2: Pokreti biljaka](https://reader030.fdocuments.net/reader030/viewer/2022033009/55d76e99bb61ebd3638b46ea/html5/thumbnails/2.jpg)
zvezda grašak cvast
zraci biber maslačak
toplota kukuruz detelina
sistem pšenica rezličak
sunce zrno glavica
suncokret
A1
A2
A3
A4
A
B1
B2
B3
B4
B
V1
V2
V3
V4
V
Konačno rešenje
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Osobine živih bića?• Rađanje• Ishrana• Rast• Razvoj• Disanje• Kretanje• Reakcije na uticaje iz spoljašnje sredine
(nadražljivost)• Razmnožavanje• Starenje• Umiranje
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Film-biljke u akciji
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Pokreti rasta
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Rast biljaka
• Biljka raste :1. Uvećanjem veličine i izduživanjem ćelije2. Povećavanjem broja ćelija-deobom
Spoljašnji i unutrašnji uslovi rasta.
povećanje tela
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Uslovi koji utiču na rastSpoljašnji uslovi Unutrašnji uslovi
SVETLOSTTOPLOTAVLAGABILJNI HORMONIMINERALIZEMLJINA TEŽA
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Privremeni pokreti
Pokreti:• Cveta• Lista• Stabljike...
Uticaji (nadražaji ) iz spoljašnje sredine:• Toplota• Vlaga• Svetlost• Dodir
Zašto se kreću životinje?
U potrazi za hranom, vodom, skloništem, partnerom za razmnožavanje...
Da li i biljke kreću iz istih razloga?
Da li se kreću u potrazi za hranom i vodom?
Da li se kreću u potrazi za skloništem?
Da li se kreću u potrazi za partnerom?
NE
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Osobine biljnih pokreta
• Obično su vrlo spori• Često su nevidljivi golim okom• Nastaju pod uticajem nadražaja iz spoljašnje
sredine
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Pokretanje cveta
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LOTOS
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LALA
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suncokret
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šafran
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Pokretanje listova
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mimoza
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Venerina muholovka
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kiselica
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rosulja
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Pokretanje stabljike
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Vinova loza
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Lijane i puzavice
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Domaći-pitanja za razmišljanje
1. Zašto se cvetovi otvaraju i zatvaraju tokom dana i noći?
2. Zašto biljke mesožerke jedu insekte?
3. Koje osobine ime četinar BOR koje ga čine živim bićem?