Video: Dab tsi yog qhov sib txawv ntawm thawj thiab theem nrab meristem?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Thawj Meristem : Thawj meristems yog cov xeeb leej xeeb ntxwv ntawm cov hlwb embryonic. Piv txwv: apical meristem ntawm tua apex thiab hauv paus apex. (2). Secondary Meristem : Secondary meristems yog cov meristematic cov ntaub so ntswg tshwm sim los ntawm cov ntaub so ntswg ruaj khov.
Tib neeg tseem nug, qhov sib txawv ntawm cov nqaij mos thawj thiab theem ob yog dab tsi?
Txhua tsob ntoo muaj thawj cov ntaub so ntswg (txawm hais tias bryophytes tsis muaj vascular cov ntaub so ntswg ). Cov ntaub so ntswg thib ob tshwm sim los ntawm ib sab (ib sab) kev loj hlob, thiab qee cov nroj tsuag herbaceous tsis tshua muaj thib ob kev loj hlob Dicots (ntoo ntoo) muaj thib ob kev loj hlob uas ua rau lawv nce hauv girth.
Kuj Paub, dab tsi yog qib thib ob meristem? A theem nrab meristem yog ib hom meristematic cov ntaub so ntswg uas yog lub luag haujlwm rau thib ob kev loj hlob ntawm cov nroj tsuag, piv txwv li kev loj hlob hauv qhov loj lossis tuab. Nws tawm tsam thawj meristem uas koom nrog hauv kev loj hlob thawj zaug, piv txwv li kev loj hlob hauv qhov siab lossis ntev.
Hauv qhov no, dab tsi yog qhov tseem ceeb tshaj plaws?
A thawj meristem yog ib hom meristematic cov ntaub so ntswg uas yog lub luag haujlwm rau thawj kev loj hlob Thawj kev loj hlob yog kev loj hlob ntev. Piv txwv ntawm a thawj meristem yog apical meristem . Apical meristems yog meristematic cov ntaub so ntswg nyob rau hauv cov apices ntawm cov nroj tsuag, xws li root apex thiab tua apex.
Qhov sib txawv ntawm xylem thawj thiab theem ob thiab phloem yog dab tsi?
Xylem nqa dej los ntawm cov hauv paus hniav mus rau lwm tsob ntoo. Zoo li phloem , xyl yam cov ntaub ntawv hauv thawj kev loj hlob, thiab secondary xylem cov ntaub ntawv hauv thib ob kev loj hlob Raws li lub caij cog qoob loo txuas ntxiv mus, cov secondary xylem nthuav mus rau qhov chaw uas lub secondary phloem tsis tuaj yeem nyob twj ywm ntxiv lawm.
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