2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Strands of phloem uas muaj tam sim no ntawm qhov chaw ntawm pith yog lub npe hu ua intraxylary phloem. Nws lub xub ntiag tseem txwv rau ib feem me me ntawm eudicots thiab suav tias yog ib tus cwj pwm zoo rau qee tsev neeg.
Intraxylary phloem yog dab tsi?
Interxylary phloem yog muaj phloem strands embedded nyob rau hauv lub thib ob xylem (ntoo), thiab tsim los ntawm kev ua ntawm ib tug cambium (Carlquist 2013). … Txawm li cas los xij, lub xub ntiag ntawm interxylary phloem yog qee zaum tsis tshua muaj tshwm sim thiab tsuas tuaj yeem lees paub los ntawm microscopy.
Ntawm twg ntawm cov nroj tsuag hauv qab no Interxylary phloem thaj ua rau thaj yog tsim?
Interxylary phloem sawv cev rau cov hlua ntawm cov hlab ntsha nrog rau cov parenchyma hlwb ua cov Islands tuaj uas tau muab tso rau hauv cov xylem theem nrab ntawm qia thiab cov hauv paus hniav. Feem ntau xws li interxylary phloem yog tsim nyob rau hauv cov nroj tsuag uas muaj ib lub nplhaib ntawm vascular cambium (Carlquist 2013).
xylem thiab phloem nyob qhov twg?
In stems and roots, lub xylem feem ntau nyob ze rau sab hauv ntawm qia nrog phloem rau sab nrauv ntawm qia. Nyob rau hauv stems ntawm ib co Asterales dicots, tej zaum yuav muaj phloem nyob rau hauv sab hauv ntawm lub xylem ib yam nkaus thiab. Nruab nrab ntawm xylem thiab phloem yog meristem hu ua vascular cambium.
Puas phloem muaj nyob hauv nplooj?
Phloem, tseem hu ua bast, cov ntaub so ntswg hauv cov nroj tsuag uas coj cov khoom noj hauv nploojrau txhua qhov chawntawm tsob ntoo. Phloem yog tsim los ntawm ntau lub hlwb tshwj xeeb hu ua sieve tubes, cov hlwb ua ke, phloem fibers, thiab phloem parenchyma cells.
Pom zoo:
Cov ntawv xov xwm pom nyob rau hauv cov ntawv xov xwm nyob qhov twg?
Editorials feem ntau yog luam tawm ntawm nplooj ntawv nplooj siab, hu ua nplooj ntawv kho, uas feem ntau sau cov ntawv rau tus editor los ntawm cov tswv cuab ntawm pej xeem; nplooj ntawv tawm tsam nplooj ntawv no yog hu ua nplooj ntawv op-ed thiab nquag muaj cov lus xav (li no lub npe xav daim) los ntawm cov kws sau ntawv tsis ncaj qha koom nrog … Lub hom phiaj ntawm kev sau ntawv hauv xov xwm yog dab tsi?
Cov ventricles hauv qab no puas pom nyob hauv lub cev?
Qhov twg ntawm cov ventricles hauv qab no pom nyob hauv corpus callosum? Lub ventricles lateral ventricles Txhua lub ventricle ventricle zoo ib yam li C-zoo li kab noj hniavuas pib ntawm lub cev tsis zoo hauv lub cev nqaij daim tawv, taug kev los ntawm lub cev hauv parietal lobe thiab frontal lobe, thiab thaum kawg txiav tawm.
Ntawm qhov capillaries pom nyob rau hauv lub cev nyob qhov twg?
Nruam: Cov capillaries no tsis muaj perforations thiab cia tsuas yog me me molecules dhau mus. Lawv tam sim no hauv nqaij, tawv nqaij, rog, thiab paj hlwb. Fenestrated: Cov capillaries no muaj cov pores me me uas tso cai rau cov molecules me los ntawm thiab nyob hauv cov hnyuv, ob lub raum, thiab cov qog endocrine.
Leej twg detering nyob rau hauv tag nrho cov nyob ntsiag to nyob rau sab hnub poob pem hauv ntej?
Detering yog tus neeg ua liaj ua teb los ntawm Txhua Tus Neeg Tsis Txaus Siabntawm Sab Hnub Poob los ntawm Erich Maria Remarque. Nws muaj siab mos siab muag, tshwj xeeb tshaj yog thaum nws los txog rau nees. Nws muaj kev kub ntxhov loj heev thaum nws hnov cov nees quaj thiab txawm sim tua lawv kom kawg lawv txoj kev txom nyem.
Cov zaub mov thauj nrog phloem nyob rau hauv daim ntawv twg?
Nyob hauv cov zaub mov uas tsim los ntawm photosynthesis yog thauj nyob rau hauv daim ntawv ntawm sucrose los ntawm phloem. Nws tau kwv yees tias 90% ntawm tag nrho cov kua nplaum nqa hauv phloem yog cov carbohydrate sucrose, ib qho disaccharide uas tsis tshua muaj zog thiab soluble qab zib heev nrog lub luag haujlwm ncaj qha hauv cov metabolism.
