Lub nplawm fern, Psilotum yog ib tsob nroj uas muaj cov actinostele. (Koj yuav ntsib Psilotum sai sai.) plectostele - interconnected cheeb tsam ntawm xylem yog collectively surrounded los ntawm ib tug loj ntawm phloem. Club mosses (Lycopodiopsida) feem ntau nthuav tawm hom kev npaj stele.
Hom stele twg pom hauv Selaginella?
Lub stele yog ntawm protostelic hom piv txwv li, xylem yog tam sim no nyob rau hauv nruab nrab thiab ncig los ntawm phloem ntawm txhua sab. Phloem, nyob rau hauv lem, yog surrounded los ntawm ib txheej txheej pericycle. Pith tsis tuaj. Lub stele tseem raug tshem tawm hauv qhov chaw los ntawm radially elongated tubular, unicellular qauv hu ua trabeculae.
Puas monocot muaj stele?
Unlike dicot roots, a monocot root has a pith in the stele. Nws kuj muaj cov kab mob vascular uas muaj xws li xylem thiab phloem. … Xylem thiab phloem yog lub luag haujlwm rau kev thauj khoom noj thiab dej thoob plaws hauv cov nroj tsuag. Cov hlwb tsuas yog nyob rau hauv lub endodermis yog hu ua lub pericycle hlwb.
hom stele feem ntau pom hauv ferns?
Lub steles-cylinders ntawm vascular cov ntaub so ntswg nyob rau hauv cov chaw ntawm fern stems-pom txawv me ntsis txawv. Feem ntau cov ferns muaj"dictyostele," uas muaj cov hlab ntsha sib cuam tshuam zoo li ntawd, nyob rau hauv ib qho kev muab hla ntawm qia, ob peb cov pob sib txawv tuaj yeem pom.
hom stele ua ranunculusmuaj?
Cov ntaub so ntswg nruab nrab ntawm lub hnub qub yog phloem. Lub hauv paus xylem thiab phloem yog ib puag ncig los ntawm endodermis, thiab tag nrho cov qauv hauv nruab nrab hu ua stele. Microscopic saib ntawm lub hauv paus ntawm buttercup (Ranunculus) qhia lub hauv paus stele thiab 4-pronged xylem.
