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Bio F5 Bab 2~1.2.3

Struktur Daun,Organ utama prtukaran gas&transpirasi

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Struktur daun trbahagi kepada dua iaitu struktur luaran&struktur dalaman.Jelaskan struktur luaran daun 1)Lamina-bhgian daun leper,mnghasilkn perm. luas supaya sel2 mngandungi kloroplas trdedh kpd cahaya matahari maks-nipis,mudhkn gas2 mresap dgn cekap-hijau 2)Petiol-tngkai daun-mnymbungkn lamina pd btng-mngunjur ke dlm lamina mbntuk jaringn urat
Apakah itu Herbarium??? Koleksi spesimen drpd tumbuhan yg tlh diawetkn mlalui kaedah trtentu
Apakah itu susunan mozek daun? lamina tumbuhan disusun agar X brtindih lalu membolehkn daun menerima cahaya matahari yg optimum
Lapisan kutikel pada epidermis atas brsifat lut sinar.Wajarkan Membenarkan cahaya mnembusinya supaya sel dlm bhgian daun dpt mnjalankn fotosintesis
Jelaskan ciri2 bagi kutikel brlilin,kalis air,luat sinar~kutikel mnghalang khilangan air brlebihan mlalui pnyejatan(transpirasi)
Apakah perbezaan bagi sel mesofil palisad&berspan?? Palisad-trsusun scra tegak&padat utk peroleh chaya matahari maks-mpunyai bnyk kloroplas srta mrupakn tapak fotosintesis Brspan-trsusun longgar&mpunyai bnyk ruang udara di antara sel-mudhkn presapn gas CO2&air mrentasi daun-kloroplas kurang-bntuk X skata
Huraikan mekanisme pembukaan stoma mlalui pengambilan ion Kalium Ion K brgrk ke dlm sel pngawal~Keupayaan larutn di dlm sel pngawal mningkat~Molekul air drpd sel2 epidermis mresap masuk ke dlm sel pngawal scra osmosis~sel pngawal mnjadi segah&mlengkung ke luar~stoma trbuka
Huraikan mekanisme penutupan stoma mlalui pengambilan ion Kalium Ion K brgrk keluar dri sel pngawal~Keupayaan larutn di dlm sel pngawal mnurun~Molekul air mresap kluar dri sel pngawal ke sel2 epidermis scra osmosis~sel pngawal mnjadi flasid~stoma trtutup
Apakah yg berlaku apabila tumbuhan adalah segar? Tumbuhan mndpt air yg mncukupi&sel pngawal segah~sel pngawal mpunyai dinding dlm sel yg tebal&kurang elastik~dinding luar sel nipis&elastik mnybbkn sel pngawal mlengkung ke luar&stoma trbuka
Taburan stoma lbh padat di perm. bwh daun brbanding perm. atas .Wajarkn Bhgian bwh daun X trdedah scra langsung kpd cahaya matahari&haba~hal ini dpt mngelakkn kehilangan air scra brlebihan
Nyatakan definisi bagi Transpirasi Proses kehilangan air dlm bntuk wap air scra sejatan drpd tumbuhan ke atmosfera
Mengapakah transpirasi diperlukan oleh tumbuhan?? 1>Akar tumbuhn mnyerap air&garam mineral dri tnh 2>Air mnyerap tenaga haba dri daun&trsjat mnjadi wap air utk mberi kesan pnyejukn kpd tumbuhn 3>Mnghasilkn daya tarikn yg mnggerakkn air&garam mineral scra brtrusan di dlm salur xilem
Apakah faktor yang mempengaruhi transpirasi?? 1)Keamatan cahaya 2)Kelembapan relatif udara 3)Suhu 4)Pergerakan udara
Created by: Enbos
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