Puas yuav ua tau kom loj hlob ib tug txiv tsawb tsis phloem?

Rub lub daj txiv tsawb tev, thiab koj yuav zoo li nws maj mam muab tsiv mas raws fetus. Thaum ib tug siav txiv tsawb nws cais yooj yim heev, nws tau matured ib tug me ntsis - yog nyuab dua. Zoo, nyob rau hauv txhua rooj plaub, nws yuav tsis xav tau.

Tab sis muaj tseem yog cov annoying dawb leeg rau tsawb los yog hais tias hais lus lom lus, 'phloem bundles'. Heev appetizing lub npe, tsis yog nws?

Yuav ua li cas yog lub phloem

Yog hais tias nws nkawd hais tias lub sij hawm "phloem" Koj paub, nws yog tej zaum vim hais tias lub tsev kawm ntawv phau ntawv muab lus qhia rau cov phloem thiab xylem. Cov ntsiab lus uas ob piav complex cov ntaub so ntswg uas thauj cov as-ham thiab cov dej los ntawm cov nroj tsuag. Lawv yog cov tsim nyog rau txoj kev loj hlob ntawm cov nroj tsuag thiab nws cov txiv hmab txiv ntoo.

Nyob rau hauv qhov tseeb, cov qias mos hlua faib as-ham thiab nce thiab nqis lub txiv tsawb raws li nws hlob, uas tso cai rau peb kom muaj ib tug qab txiv hmab txiv ntoo, uas muaj ntau yam yog vim li ntawd fond ntawm.

Ib txhia neeg muaj heev npaum li cas ntxub cov bundles ntawm phloem hais tias txawm mob siab rau qhov no lub ntsiab lus tag nrho blogs. Tab sis ua neeg yuav tsum paub txog cov phloem ntxiv? Tej zaum tsuas yog ib tug kws muaj txuj rau tsawb yuav piav ib tug ntau ntawm nuances.

Lub tswv yim ntawm ib tug kws muaj txuj nyob rau hauv lub tshav pob ntawm Science News for KIDS

Yog xav tau cov lus teb rau koj cov lus nug, sau xov xwm Huffington Post muaj ib tug kev sib tham nrog Dr. Nicholas D. Gillittom, ib tug kws nyob rau hauv lub cheeb tsam ntawm lub cev inorganic Science News for KIDS. Nws tseem yog vice-tus thawj tswj hwm ntawm kev tshawb fawb thiab cov thawj coj ntawm kev noj haus nyob rau ntawm lub lub koom haum ntawm dole Food.

Yog li ntawd, seb puas nyob rau hauv lub tus nqi noj haus ntawm ib tug txawv muaj yog nruab nrab lub bundles ntawm phloem thiab tus so ntawm lub siav ib feem ntawm lub txiv hmab txiv ntoo, zoo li ib tug txiv tsawb?

Gillitt hais tias: "Txawm hais tias zaum phloem bundles yog tsis tau soj ntsuam kuaj, nws yog yuav hais tias lawv tus nqi noj haus yuav tsum sib txawv. Qhov no yog vim lub fact tias lawv yog tsim los ua ib qho hauj lwm, thiab raws li xws li muaj ib tug meej qauv uas txhawb nqa txoj hauj lwm no. Nws mus tsis tau hais tias lawv yuav muaj ib tug muaj pes tsawg leeg coj mus rau nyob tus yeees ntawm cov ib txwm siav sis plawv hniav ntawm txiv tsawb. Nws yog tseem yuav hais tias lub phloem bundles muaj ib tug loj tus naj npawb ntawm ntau hom ntawm fibers thiab cov yam ntxwv yam tsim nyog rau lawv tau hauj lwm. Vim hais tias ntawm no lawv yog cov yuav muaj lwm yam as muaj pes tsawg leeg. Txawm li cas los, lawv yog tam sim no nyob rau hauv xws me me raws li muab piv rau tus so ntawm lub txiv tsawb tias yog hais tias lawv tsis noj ib leeg, nws yuav tsis cuam tshuam rau tag nrho tus nqi noj haus ntawm cov txiv hmab txiv ntoo. "

Koj phloem ruaj ntseg?

Yog phloem bundles ruaj ntseg? Lo lus nug no Gill hais tias: "Nyob rau hauv Feem ntau, tag nrho cov txiv hmab txiv ntoo yog tsis lom. Cov neeg noj peel apples, pears thiab thiaj li nyob. D., Thiab lawv yuav muaj cov tawv tsawb, xws li bundles ntawm phloem, yog hais tias nws yog suav tias yog siv tau. Science tsis tau muab tej yuam pov thawj hais tias lawv muaj teeb meem rau tib neeg lub cev. Tej fiber yuav ntaus nqi rau ib tug xov tooj ntawm cov khoom noj. "

Guillen sau ntawv uas nyob rau hauv Feem ntau, tsis tau txais tej tseem ceeb kev tsis txaus siab los ntawm cov kev pab nyob rau hauv lub phloem bundles. Ntawm tus taw tes ntawm view ntawm tus paub txog, uas siv ob peb raug soj ntsuam nrog rau pua pua ntawm kev kawm, noj mov ib tug ntau ntawm txiv tsawb thaum lub sij hawm ntawm txoj kev tshawb, nws yuav nrog certainty hais tias tsis tau qhia ib tug ib rooj plaub uas tus kawm yuav tau xav hais tias lub bundles ntawm phloem yog ib tug noj qab haus huv teeb meem.

Puas yuav ua tau kom tsim muaj ib tug txiv tsawb tsis phloem?

Qhov no yog ib tug heev interesting lo lus nug. Tus kws tshawb fawb neeg pab leg ntaubntawv hais tias cov uas sai tau. Tab sis yog hais tias tus phloem bundles uas yuav tsum tau rau ib tug txaus muab faib rau cov as-ham thoob plaws cov nroj tsuag, thiab yog tsis tshua redundant, ces dab yuav tsav txoj kev loj hlob ntawm lub txiv tsawb? Ntawm tus taw tes ntawm view ntawm cov neeg sawv cev ntawm lub tuam txhab rau kom nkag tau mus rau kev noj qab nyob cov khoom noj, yuav tsum muaj ntau npaum li kauj ruam tseem ceeb mus nqa tawm kev tshawb fawb rau hauv yug me nyuam ntawm tus kab mob-resistant ntau yam ntawm txiv tsawb uas yuav muaj cov as-ham.