Video: Secondary xylem yog dab tsi?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Secondary xylem hais txog kev tsim uas tshwm sim tom qab vascular cambium's thib ob kev loj hlob Hom ntawm xylem tsis muaj nyob hauv cov ntoo uas tsis yog ntoo, tab sis feem ntau pom hauv cov ntoo thiab ntoo. Secondary xylem muaj cov nkoj loj-loj thiab tracheids.
Ib yam li ntawd, xylem theem nrab thiab phloem yog dab tsi?
mus rau sab hauv yog hu ua secondary xylem , lossis ntoo, thiab cov tsim rau sab nraud ntawm cambium hu ua secondary phloem . Cov tawv ntoo thiab ntoo ua ke ua tus theem nrab cog lub cev ntawm tsob ntoo. Cov ntoo vascular cov ntaub so ntswg muab ob qho tib si longitudinal thiab transverse txav rau carbohydrates thiab dej.
Ib sab saum toj, dab tsi yog lwm txoj haujlwm tseem ceeb ntawm xylem theem ob? Kev ua haujlwm thib ob xylem yuav tsum muab kev txhawb nqa tshuab, ua kom tau raws dej thauj cov kev xav tau, ua haujlwm cia rau ob qho tib si dej thiab carbohydrates, thiab teb rau qia qhov txhab los ntawm kev tsim cov ntaub so ntswg tshiab thiab compartmentalization ntawm lwj.
Ib sab saum toj no, qhov sib txawv ntawm xylem thawj thiab theem ob yog dab tsi?
Lub ntsiab qhov sib txawv ntawm thawj xylem thiab secondary xylem yog tias xyl yam yog tsim los ntawm cov thawj kev loj hlob ntawm procambium whereas secondary xylem yog tsim los ntawm cov theem nrab kev loj hlob ntawm vascular cambium. Lub luag haujlwm tseem ceeb ntawm xylem cov ntaub so ntswg hauv cov nroj tsuag yog ua dej thiab ntxhia los ntawm hauv paus mus rau nplooj.
Puas yog xylem thib ob muaj txoj sia nyob?
Cov parenchyma cells ntawm xylem rays yog ciaj nyob rau hauv lawv mature, functional xeev. Raws li cov khoom siv nkoj tshiab los yog tracheids tau ua, cov laus tau dhau los faus hauv cov txheej txheem txuas ntxiv ntawm cov nyuam qhuav tsim xyem . Raws li tsob ntoo zuj zus zuj zus hauv txoj kab uas hla, loj dua secondary xylem cov ntaub so ntswg tsis ua dej ntxiv lawm.
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