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1.9 Gerak Balas Dalam Tumbuhan

1.9 Gerak Balas Dalam Tumbuhan. Disediakan Oleh : Siti Rohayu Binti Che Hassan. OBJEKTIF PENGAJARAN. Menyatakan rangsangan yang menyebabkan gerak balas tumbuhan . Mengenal pasti bahagian tumbuhan yang peka terhadap rangsangan tertentu .

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1.9 Gerak Balas Dalam Tumbuhan

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  1. 1.9 GerakBalas DalamTumbuhan DisediakanOleh: SitiRohayuBintiChe Hassan

  2. OBJEKTIF PENGAJARAN Menyatakanrangsangan yang menyebabkangerakbalastumbuhan. Mengenalpastibahagiantumbuhan yang pekaterhadaprangsangantertentu. Menghubungkaitgerakbalastumbuhandengankemandiriannya

  3. GerakBalasTumbuhan • Tropisme • Gerakbalaspertumbuhanbahagianpucukdanakarterhadaprangsangan. • Arahpertumbuhanbergantungkepadaarahrangsangan. • Contoh: Fototropisme, Geotropisme, HidrotropismedanTigmotropisme. • GerakanNasti • Gerakbalassebahagiantumbuhanterhadaprangsanganluar. • Arahgerakantidakbergantungkepadaarahrangsangan. • Contoh: Fotonasti, Termonasti, Niktinastidanseisminasti. Tropismepositif - Kearahrangsangan Tropism negatif - Menjauhirangsangan

  4. GerakBalasTropisme Contohgerakbalas: Fototropisme – Gerakbalastumbuhanterhadapcahaya. Geotropisme – Gerakbalastumbuhanterhadapgraviti. Hidrotropisme – Gerakbalastumbuhanterhadap air. Tigmotropisme – Gerakbalasterhadapsentuhan.

  5. Eksperimen 1.1 (c): Gerakbalastumbuhan terhadapcahaya

  6. GerakanNasti Contohgerakbalas: Fotonasti – rangsangandaripadacahaya. Termonasti – Rangsanganakibatperubahansuhu. Seismonasti– Akibatsentuhan

  7. KESIMPULAN

  8. UjiKendiri 1.8 LihatBukuTeksMukaSurat40

  9. SEKIAN. TERIMA KASIH .

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