Tracheid, nyob rau hauv botany, primitive element ntawm xylem (kua-ua cov ntaub so ntswg), muaj xws li ib tug ib leeg elongated cell nrog taw tes xausthiab ib nrab, cellulosic phab ntsa thickened nrog lignin (tshuaj binding tshuaj) muaj ntau lub qhov tab sis tsis muaj perforations nyob rau hauv thawj cell phab ntsa.
Yog tracheids hlwb?
Ib tracheid yog ntev, lignified cell nyob rau hauv xylem ntawm vascular nroj tsuag. … Thaum laus lawm, tracheids tsis muaj protoplast. Lub luag haujlwm tseem ceeb yog thauj cov dej thiab cov ntsev inorganic, thiab muab kev txhawb nqa rau cov ntoo.
hom cell yog tracheids?
Lub xylem tracheary ntsiab muaj cov hlwb hu ua tracheids thiab cov hlab ntsha, ob qho tib si feem ntau nqaim, hollow, thiab elongated. Tracheids tsis tshua muaj kev tshwj xeeb tshaj li cov tswv cuab ntawm lub nkoj thiab tsuas yog hom dej ua cov hlwbhauv cov gymnosperms feem ntau thiab cov nroj tsuag tsis muaj noob.
Pob tracheids puas muaj cov hlwb ua ke?
Tracheids muaj cov phab ntsa hauv nruab nrab tuab thiab yog tapered ntawm qhov kawg. … Cov tshuaj taug kev raws lub sieve, tab sis lwm hom hlwb kuj muaj:cov hlwb sib luag, parenchyma hlwb, thiab fibers. Cov phab ntsa kawg, tsis zoo li cov tswv cuab hauv lub nkoj hauv xylem, tsis muaj qhov qhib loj.
Cov hlwb tracheids pom nyob qhov twg?
Tracheids yog cov hlwb tsis muaj sia nyob hauv cov xylem ntawm ntau hom nroj tsuag qub, noob tsis muaj vascularnroj tsuag (ferns, qws mosses, thiab horsetails) thiab gymnosperms (cedar, ntoo thuv, thiab cypress ntoo).
