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STRUKTUR DAN FUNGSI DAUN STRUCTURE & FUNCTION OF LEAF

STRUKTUR DAN FUNGSI DAUN STRUCTURE & FUNCTION OF LEAF. By: IDA RIANAWATY Januari 2010. DAUN (LEAF).

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STRUKTUR DAN FUNGSI DAUN STRUCTURE & FUNCTION OF LEAF

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  1. STRUKTUR DAN FUNGSI DAUNSTRUCTURE & FUNCTION OF LEAF By: IDA RIANAWATY Januari 2010

  2. DAUN (LEAF) Daun yang lengkapmempunyaibagianupihdaun (pelepahdaun), tangkaidaun (petioles), danhelaiandaun (lamina). Daun yang tidaklengkaptidakmempunyaisatuatauduabagiantersebut. Contohnyadaunmanggadandaunnangka. Daunlengkapdapatdijumpaipadapohonpisangdanrumput-rumputan. Complete leaf has sheat (stipulae), leaf stalk (petiole) and incomplete one. Complete leaf has sheath (stipulae),leaf stalk (petiole), and blade (lamina). Incomplete leaf does not have one or two of the components.The example mango and jackfruit. Complete leaves can be found in banana and grasses.

  3. Struktur Morfologi DaunMorphological Structure of LeafSumber: http://www.britannica.com

  4. Berdasarkansusunandaunnya, daundibedakanmenjadidauntunggaldandaunmajemuk. Dauntunggaladalahdaun yang memilikisatudaunpadasatutangkainya, sedangkandaunmajemukadalahdaun yang memilikibeberapa (lebihdarisatu) daunpadasatutangkainya. Based on composition of leaf, leaf is separated to be simple leaf and compound leaf. Simple leaf is that has on leaf in its stalk, while compound leaf is leaf that has some (more than one) leaves in one of its stalk.

  5. Struktur Anatomi DaunAnatomycal Structure of leaf Strukturdalamdaunterdiridariatas epidermis, jaringan palisade (jaringantiang), danjaringanspons (jaringanbungakarang). The anatomycal structure in leaf consists of epidermis, palisade tissue (pole tissue), and spongy tissue (coral flower tissue).

  6. STOMATA

  7. EPIDERMIS Pada epidermis daunterdapatcelah-celah yang diapit olehduaselpenjaga. Celah-celahtersebutdisebut sebagaistomata (mulutdaun), yang berfungsisebagai jalankeluarmasuknyaudaradanmenghubungkan udaraluardenganronggaudarapadajaringan bungakarang. In leaf epidermis is found slits that are pinched by two guardian cells. Those slits are called stomata (leaf mouth), that function as the gate for air and connect free air cavityin coral flower tissue.

  8. Jaringan Palisade (JaringanTiang) Pallisade tissue (pole tissue) Jaringantiangtersusundarisatuataubeberapa lapis sel yang memanjangdalamposisitegakdanberisibanyakkloroplas. Sehinggapadajaringaninilahtempatberlangsungnyafotosintesis. Palisade consists of one or few layers of cells elongating vertically and containing a lot of chloroplast. So in this tissue happens photosynthesis process.

  9. JaringanBungaKarang ( Jaringanspons) Spony tissue. Jaringanbungakarangterletakdibawahjaringan palisade, disebutsebagaijaringansponskarenasel-selnyatersusuntidakrapatsehinggaterdapatrongga-ronggaudaratempatberlangsungnyapertukaran gas. Sel-selnyajugaberkloroplassehinggamenjaditempatfotosintesis. Spongy tissue is located under palisade tissue, it is called as spongy tissue because its cells are composed not dense so it is found air cavities the place of gaseus exchange happens. It also consist of chloroplast, so that it also becomes the place for photosynthesis.

  10. JaringanPengangkut Vascular Tissue Jaringanpengangkutpadadaunmembentuksuatu system percabangansepertijala yang kompleks, disebuttulangdaun. Tulangdaunterletakdiantarajaringantiangdanjaringanbungakarang. Padasayatanmelintang, tulangdaunmerupakanberkaspengangkut yang tersusundari xylem danfloem. Vascular tissue on leaf forms complex net-like branch system, which is called vein. The vein shows vascular bundles including xylem and phloem.

  11. FungsiDaunFunction of Leaf - sebagai tempat fotosintesis - sebagai alat penguapan (evaporasi) - sebagai tempat menyimpan bahan makanan - sebagai alat perkembangbiakan vegetatif - As a place of photosynthesis - As a means of vaporization (evaporation) - As a place to store food - As a means of vegetative reproduction

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