Download - Akar (5)
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Sistem perakaran
Akar tunggang/tap root
(radix primaria)
Akar serabut/fibrous root(radix adventia)
Kebanyakan tumbuhan dikotil
Kebanyakan tumbuhan monokotil
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Bagian akar
tudung akar (kaliptra)
leher akar/pangkal akar (kollum)
ujung akar (apeks radikis)
batang akar/akar primer (korpus radikis)
cabang akar/akar lateral (radiks lateralis)
rambut akar (pilus radikalis)
Akar tunggang (tap root)
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leher akar/pangkal akar (kollum)
Akar serabut (fibrous root)
Dari leher akar tumbuh banyak akar primer
Perbedaan akar lateral dan akar primer tidak jelas
tudung akar (kaliptra)
ujung akar (apeks radikis)
rambut akar (pilus radikalis)
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tudung akar (kaliptra)
ujung akar (apeks radikis)
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Kacang
Dikotil epigeal
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Pea (ercis / kacang polong)
Dikotil hipogeal
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Monokotil epigeal
Onion (brambang)
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Monokotil hipogeal
Maiz (jagung)
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Bentuk akar
Akar tunggangBerdasar cabang Tidak (sedikit)
bercabang• Bentuk tombak (fusiformis)
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• Bentuk gasing (nafiformis)
Beta vulgaris
Pachyrhizus erosus
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• Bentuk benang (filiformis)
Bercabang (ramosus)
Phaseolus lunatus
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Akar serabut Bentuk benang
Oryza sativa
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Tumbuhan prairi
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Keras dan agak besar
Keras dan besar
Pandanus tectorius
Cocos nucifera
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Macam akar
•Akar gantung/udara (radix aereus)
•Akar pengisap (houstorium)
Berdasar fungsi
Cuscuta australis
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•Akar lekat (radix adligans)
•Akar pembelit (cirrus
radicalis)•Akar nafas
(pneumatofora)Vanila
planifoliaRhizospora sp
Anthurium sp
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•Akar tunjang
•Akar banir/papan
Pterocarpus indicus
Pandanus tectorius
Sansiviera sp
Akar yang tumbuh bukan dari biji
adalah akar liar atau adventiv (radix
adventisius)Banyan
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•Akar lutut
Bruguiera parvifoliaBruguiera cylindrica
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MODIFIKASI
• DaunMenjadi seperti mahkota bunga sebagai pemikat serangga (Opuntia sp.)
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• Petioluso Menjadi batang, disebut batang semu (Musa sp)
o Sebagai penyimpan fotosintat, sisik berlapis (umbi lapis) (bulbus tunicatus)
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Batang asli sangat pendek (rudimenter) disebut cakram (diskus). Petiolus sebagai sisik berlapis disebut tunica/squama. Dari samping tumbuh tunas (tunas samping), kmd menjadi siung.
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o Sebagai penyimpan fotosintat, sisik tak berlapis
o(bulbus squamosus) ((Lilium candidum)
• Batang o Sebagai penyimpan fotosintat, dalam tanah, disebut
umbi/tuber (tuber caulogenum) ((Solanum tuberosum)
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Zingiber officinaleCurcuma longa
Languas galanga
Cyperus rotundus
Marbel (Colocasia sp)
o Batang tumbuh dalam tanah (menjalar) disebut rimpang/geragih atau rhizome, umumnya mengandung metabolit sekunder (
Dioscorea hispida
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Akar digunakan sebagai tempat penyimpan fotosintat/umbi akar (tuber rhizogenum)
• Akar
Corm
Gladiole
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KUNCUP /TUNAS/BUD (GEMMA)
Berdasar letak tunas: Gemma terminalis
Gemma axilaris/lateralis
Berdasar perkembangan:
Gemma foliifera Gemma florifera/alabastrum
Gemma mixta
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Tunas yang tumbuh di tempat lain atau tunas liar (gemma adventisius)
Di sembarang tempat pada batang yang jika tumbuh disebut wiwilan (tunas air)
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Di tepi daun
Kalanchoe waldheimii
Di akar
Artocarpus communisSebagian akar muncul ke permukaan tanah dan tumbuh tunas