Video: Dab tsi ua rau xylem thib ob?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Lub vascular cambium tsim tawm xylem thib ob nyob rau sab hauv ntawm lub nplhaib, thiab theem nrab phloem rau sab nraud, thawb lub hauv paus xyem thiab phloem sib nrug.
Kuj paub, yuav ua li cas theem nrab xylem yog tsim?
Thawj xylem yog tsim thaum lub sij hawm thawj kev loj hlob ntawm procambium. Metaxylem tsim tom qab protoxylem tab sis ua ntej secondary xylem . Metaxylem muaj cov hlab ntsha dav thiab tracheids ntau dua li protoxylem. Secondary xylem tau tsim thaum thib ob kev loj hlob los ntawm vascular cambium.
xylem thib ob thaum kawg dhau los ua ntoo li cas? Secondary xylems tuaj yeem siv los faib cov tshuaj ntxhia ntxhia nrog rau cov dej thoob plaws hauv tsob ntoo. Hauv qee kis, nws tseem hloov cov dej poob thaum lub sijhawm txheej txheem ntawm cov duab hluavtaws thiab cov pa tawm. Tsis zoo li thawj xyem , secondary xylem tshwm sim nyob rau hauv thaj ua rau thaj ntawm qhov chaw ntawm cov nroj tsuag.
Ib sab saum toj, qhov twg yog qhov thib ob xylem thiab phloem tsim?
Lawv tsim theem nrab cov ntaub so ntswg los ntawm lub nplhaib ntawm vascular cambium nyob rau hauv stems thiab keeb kwm. Secondary phloem cov ntaub ntawv raws ntug sab nrauv ntawm lub nplhaib cambium, thiab Secondary xyem (piv txwv li, ntoo) cov ntaub ntawv raws ntug sab hauv ntawm lub nplhaib cambium.
Dab tsi ua rau phloem theem nrab?
Qee lub cell ua los ntawm vascular cambium tuaj yeem sib txawv secondary phloem (lwm yam li thib ob xylem). Cov secondary phloem yog nyob hauv cov qia thiab cov hauv paus hniav. Nws tsim sab hauv rau thawj phloem . Radial system ntawm phloem rays tshwm sim nyob rau hauv lub Secondary phloem.
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