Qhov txawv ntawm Xylem thiab Phloem

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Qhov txawv ntawm Xylem thiab Phloem
Qhov txawv ntawm Xylem thiab Phloem

Video: Qhov txawv ntawm Xylem thiab Phloem

Video: Qhov txawv ntawm Xylem thiab Phloem
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Qhov sib txawv tseem ceeb ntawm xylem thiab phloem yog xylem yog cov ntaub so ntswg uas ua dej thiab cov zaub mov thoob plaws hauv lub cev cog thaum phloem yog cov ntaub so ntswg uas ua suab thaj (khoom noj) nyob ib ncig ntawm lub cev cog.

Tracheophytes yog cov nroj tsuag vascular uas muaj cov kab mob vascular. Lub vascular system yog ib lub network ntawm cov nroj tsuag uas muaj cov ntaub so ntswg tshwj xeeb thiab cov hlwb sib txuas. Lawv khiav longitudinally hauv cov nroj tsuag lub cev raws li cais vascular bundles los yog hlab. Yeej, lub vascular system saib xyuas kev thauj mus los ntawm cov khoom nyob ib ncig ntawm lub cev cog. Rau lub hom phiaj no, muaj ob hom kev coj los yog cov ntaub so ntswg uas yog xylem thiab phloem hauv cov nroj tsuag. Xylem thiab phloem txawv ntawm ib leeg structurally thiab functionally. Yog li ntawd, peb tuaj yeem sib tham txog qhov sib txawv ntawm xylem thiab phloem raws li ob qho no.

Xylem yog dab tsi?

Y Xylem yog cov ntaub so ntswg tubular uas thauj cov dej thiab cov ntxhia hauv cov hauv paus hniav mus rau lwm qhov ntawm lub cev. Xylem khiav ib sab ntawm phloem nyob rau hauv lub vascular pob, thiab nws kuj khiav longitudinally los ntawm cov hauv paus hniav mus rau stems thiab nplooj. Raws li txoj cai, xylem yog kev sib sau ua ke ntawm ntau hom cell sib txawv. Ntxiv mus, tom qab kev tsom xam qhov tob, peb tuaj yeem pom tias xylem muaj cov hlwb hauv qab no; Cov hlab ntsha, tracheids thiab xylem fibers thiab parenchyma.

Qhov txawv ntawm Xylem thiab Phloem_Fig 01
Qhov txawv ntawm Xylem thiab Phloem_Fig 01
Qhov txawv ntawm Xylem thiab Phloem_Fig 01
Qhov txawv ntawm Xylem thiab Phloem_Fig 01

Figure 01: Xylem

Tracheids yog cov hlwb ntev ntev uas muaj qhov xaus thiab txuas rau ib leeg txhawm rau tsim cov qauv zoo li lub raj. Ntawm qhov tod tes, cov ntsiab lus ntawm cov hlab ntsha yog cov hlwb luv thiab dav dua uas muaj cov phaj perforated hauv txhua sab ntawm cov hlwb. Sib nrug los ntawm cov hlab ntsha thiab tracheids, xylem parenchyma thiab fibers structurally txhawb cov ntaub so ntswg xylem. Thaum lub sij hawm loj hlob, lawv muaj nyob rau hauv cov ntaub so ntswg uas tsis nyob.

Phloem yog dab tsi?

Phloem yog cov ntaub so ntswg tubular uas ua cov khoom noj los ntawm cov khoom siv photosynthetic ntawm cov nroj tsuag mus rau lwm qhov ntawm cov nroj tsuag lub cev. Nws ua kom yooj yim bidirectional txav ntawm cov khoom noj. Raws li txoj cai, nws muaj peb hom loj ntawm cov hlwb uas yog sieve tube hlwb, cov hlwb ua ke thiab phloem parenchyma.

Qhov txawv ntawm Xylem thiab Phloem_Fig 02
Qhov txawv ntawm Xylem thiab Phloem_Fig 02
Qhov txawv ntawm Xylem thiab Phloem_Fig 02
Qhov txawv ntawm Xylem thiab Phloem_Fig 02

Daim duab 02: Phloem

Tsis zoo li xylem, phloem tsis muaj lignified cell phab ntsa, hloov, tag nrho cov hlwb muaj cov phab ntsa mos. Tsis tas li ntawd, cov hlwb tseem nyob. Nyob rau hauv lub vascular pob, phloem tshwm sim nyob rau sab nraum lub vascular bundle.

Yim Zoo Li Cas Ntawm Xylem thiab Phloem?

  • Phloem thiab xylem yog sib ze thiab feem ntau pom nyob ib sab ntawm ib leeg.
  • Tseem, lawv ua ke ua ib pob vascular.
  • Thiab, ob leeg yog cov qauv tubular.
  • Tsis tas li ntawd, lawv yog cov ntaub so ntswg.

Qhov txawv ntawm Xylem thiab Phloem yog dab tsi?

Xylem ua dej thiab cov zaub mov los ntawm cov hauv paus hniav mus rau qhov sib txawv ntawm cov nroj tsuag. Ntawm qhov tod tes, phloem thauj khoom noj los ntawm nplooj mus rau lwm qhov chaw cog qoob loo kom muaj sia nyob. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm xylem thiab phloem. Tsis tas li ntawd, ib qho sib txawv ntawm xylem thiab phloem yog tias xylem ua tsis nyob hauv kev loj hlob thaum phloem tseem muaj sia nyob txawm tias thaum loj hlob.

Ntxiv mus, qhov sib txawv ntawm cov xylem thiab phloem yog qhov xwm txheej ntawm lawv phab ntsa. Qhov ntawd yog; cov ntaub so ntswg xylem yog tawv-walled thaum phloem cov ntaub so ntswg yog mos-walled nyob rau hauv cov xwm. Ntxiv rau qhov ntawd, kev txav ntawm cov dej thiab cov zaub mov raws li xylem yog unidirectional thaum lub zog ntawm cov zaub mov raws phloem yog bidirectional. Cov nram qab no infographic ntawm qhov sib txawv ntawm xylem thiab phloem qhia ntau qhov sib txawv ntawm ob qho tib si.

Qhov sib txawv ntawm Xylem thiab Phloem hauv Daim Ntawv Tabular
Qhov sib txawv ntawm Xylem thiab Phloem hauv Daim Ntawv Tabular
Qhov sib txawv ntawm Xylem thiab Phloem hauv Daim Ntawv Tabular
Qhov sib txawv ntawm Xylem thiab Phloem hauv Daim Ntawv Tabular

Summary – Xylem vs Phloem

YXylem yog ib feem ntawm cov hlab ntsha uas tawv-walled. Ntawm qhov tod tes, phloem yog qhov thib ob ntawm cov ntaub so ntswg uas yog mos-walled. Tsis tas li ntawd, xylem thauj dej thiab minerals thaum phloem thauj khoom noj thiab khoom noj. Peb tuaj yeem xav txog qhov no yog qhov sib txawv tseem ceeb ntawm xylem thiab phloem. Tsis tas li ntawd, xylem txav yog unidirectional thaum phloem txav yog bidirectional. Txawm li cas los xij, ob qho tib si xylem thiab phloem yog cov ntaub so ntswg uas muaj ntau hom cell.

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