Leaf venation: izinhlobo, isakhiwo, izibonelo

Leaf ingxenye aboveground nezitshalo kuqinisekisa ukuthi eziningi imisebenzi ebalulekile. Omunye wabo ukuqaliswa ukugeleza phezulu kwehle yamanzi izakhi ziyoncibilika. Lokhu ngokuyinhloko senzeka ngosizo izinyanda fibrovascular - emithanjeni. Ziyakwazi kulula ukubona ku iqabunga ikhaba, ngisho ngokubona okubonakala ngeso lenyama. Venation amaqabunga, izinhlobo zalo nezici ukusebenza futhi kuzoxoxwa ngakho esihlokweni sethu.

Uyini izimbambo leaf

Ngokuqinisekile, abe anaka lamina, uke waphawula yini amaphethini eyinkimbinkimbi ubuso bayo. Lena ngemithambo amaqabunga. Kodwa lokhu akulona nje isici iphethini. Limelela izakhi conductive kwezicubu isitshalo. Emithanjeni, eyaziwa nangokuthi semithambo fibre izinyanda, eyakhiwa ezitsheni ngesihlungo amashubhu. Eyokuqala kunikeza ukugeleza phezulu yamanzi. essence yayo itholakala ukunyakaza ketshezi amaminerali ziyoncibilika kusukela ezimpandeni amahlamvu. Le nqubo kubaluleke kakhulu, ngoba inqubo ye-photosynthesis, amanzi lubaluleke.

amahlamvu Venation inikeza inqubo reverse. essence yayo itholakala ukunyakaza izinto eziningi eziphilayo zazo kwakheka Ishidi Yiqiniso-photosynthesis, kwezinye izingxenye zalesi sihlahla. Lokhu kwenziwa amashubhu ngesihlungo Indwangu conductive. Ngokuvamile, izitsha zitholakala phezu amashubhu ngesihlungo ndawonye bese bakha okuthiwa ishidi core.

Izinhlobo venation ishidi

Fibrovascular izinyanda asezindaweni amahlamvu ezahlukene izindlela. Ziya ngokuya indawo yabo - lena leaf venation. Lesi sici ehlelekile. Lokhu kusho ukuthi kungenzeka ukunquma uhlobo ngezigaba iyunithi simila. Ngokwesibonelo, veining net ejwayelekile amaqabunga dicots. Lokhu amahlamvu iphethini kukhona cherry ithini lamapheya, apula. A arc kuqondane and - I-monocots. Izibonelo izitshalo nge lolu hlobo venation kukhona lily, onion, ukolweni, ibhali. Venation uhlamvu kulula ukubona ongaboni. Ake sihlolisise izinhlobo zalo eziyisisekelo.

Parallel leaf venation

Kukhona ubuhlobo ocacile phakathi uhlobo lamina bese venation. Ake sicabangele isibonelo kakolweni utshani. Lesi simila namahlamvu komugqa kuyinto ukhula eziyingozi. Lahla kungaba nzima ukusuka kuye. Ngemithambo amaqabunga lezi ngempela zitholakala cishe line eyodwa. Lolu hlobo venation libizwa ngokulinganisa. Kuyinto isici zonke utshani, okuyinto abamele monocots.

arc venation

Uma ukudla leaf kuyinto ebanzi, kodwa side, neziqu ziyaphuma buqala. Ngaphezu kwalokho, washintsha ngesimo lwesikhathi, futhi axhunyiwe phezulu. Midrib wabo ungakwazi ukuhlukanisa, njengoba wonke bayafana umumo kanye nosayizi. Lokhu venation arc amaqabunga, okuyinto sici ukhova, umnduze Tulip.

venation reticulate

Lolu hlobo venation uvame yendalo. Leli qiniso zingachazwa kalula. venation reticular amahlamvu ejwayelekile ye engxenyeni eluhlaza wabo bonke abamele bipartite, futhi anesikhundla evelele emhlabeni simila. bona kude khulu abanye izinombolo nezinhlobo ukwehluka.

Wonke umuntu oye wabona leaf Maple noma apula. Bona midrib iyabonakala ngokucacile. Ukushiya ke zombili izinkomba obunganakekile fibrovascular izinyanda ukuze yesibili. Maqondana nomunye, basuke wahlela ngokuyisisekelo ngokulinganisa. Kusukela ngemithambo wesibili oda, esikhundleni salokho, ukunweba ngisho ezincane. Ndawonye, akha inethiwekhi aminyene conductive izakhi leaf izicubu. Ukuze sinikeze ngempumelelo zonke izinto ezidingekayo ukuze ukuphila uhlobo ephelele iningi veining. Izitshalo omkhaya Rosaceae, Iklabishi, Bean, Solanaceae, Asteraceae kukhona engokomfanekiso.

Ngakho, ukuba afingqe: Leaf venation Uyinhloboni indawo izinyanda fibrovascular on ipuleti. Ziyakwazi tincenye Indwangu conductive futhi ukuqinisekisa ukunyakaza izakhi ezikulesi simila. Kunezinhlobo ezintathu oyinhloko venation: net, futhi arc ngokulinganisa.