Qhov sib txawv tseem ceeb ntawm stomata thiab guard cells yog tias lub stomata yog qhov pores uas nyob rau ntawm daim tawv nqaij ntawm nplooj, stems, thiab lwm yam, thaum lub cev tiv thaiv yog cov hlwb uas nyob ib puag ncig thiab tswj qhov qhib thiab kaw ntawm stomata.
Ua pa thiab photosynthesis yog ob txoj haujlwm tseem ceeb hauv cov nroj tsuag. Hauv ob txoj kev, kev sib pauv roj yog qhov tseem ceeb. Stomata thiab guard cells pab txoj haujlwm no ntawm kev sib pauv roj hauv cov nroj tsuag. Ntawm no, cov hlwb tiv thaiv yog parenchyma hlwb, thiab lawv yog cov hlwb uas nyob ib puag ncig stomata. Tiv thaiv hlwb tswj kev kis kab mob, uas yog txheej txheem tseem ceeb ntawm cov nroj tsuag uas ua kom cov nroj tsuag noj qab haus huv. Tsis tas li ntawd, cov cell tiv thaiv muaj chlorophylls. Li no, lawv muaj peev xwm ntawm photosynthesizing ib yam nkaus.
Stomata yog dab tsi?
Stomata (singular stoma) yog qhov pores pom nyob rau hauv lub epidermis ntawm nplooj, stems, thiab lwm yam photosynthesizing qhov chaw ntawm cov nroj tsuag. Ua ke nrog cov neeg zov lub hlwb, stomata tswj kev hloov pauv thiab roj pauv hauv cov nroj tsuag. Thaum nruab hnub, cov nroj tsuag tsim khoom noj los ntawm photosynthesis. Photosynthesis xav tau dej thiab carbon dioxide. Tsis tas li ntawd, photosynthesis tsim cov pa oxygen raws li cov khoom lag luam. Cov CO2 thiab O2 pauv ntawm stomata. Yog li ntawd, stomata qhib thaum nruab hnub nyob rau hauv teb rau lub teeb. Raws li qhov tshwm sim ntawm cov tshuaj hormone abscisic acid synthesizes nyob rau hauv drought kev nyuaj siab, stomatal qhib kaw los tiv thaiv dej los ntawm lawv.
Daim duab 01: Stomata
Qhov qhib thiab kaw ntawm stomata feem ntau yog nyob ntawm tus neeg saib xyuas cov dej muaj peev xwm. Thaum tus neeg zov lub hlwb nqus dej thiab ua turgid, nws ua rau qhib stomata. Ntawm qhov tod tes, thaum dej poob los ntawm cov neeg zov me nyuam, cov neeg saib xyuas cov hlwb ua flaccid. Yog li ntawd, nws ua rau kaw ntawm stomata. Txhawm rau kom txo qis kev hloov pauv, stomata feem ntau nyob rau hauv qis qis ntawm nplooj ntawm cov nroj tsuag feem ntau.
Guard Cells yog dab tsi?
Cov hlwb yog parenchyma hlwb. Lawv yog cov hlwb uas tswj kev hloov pauv hauv cov nroj tsuag los ntawm kev qhib thiab kaw cov pores hu ua stomata. Txhua lub stoma nyob ib puag ncig los ntawm ob lub cev tiv thaiv.
Daim duab 02: Guard Cells
Ntxiv mus, cov hlwb tiv thaiv yog cov hlwb tshwj xeeb thiab tseem ceeb hauv cov nroj tsuag. Guard hlwb tsis tsuas yog pab txhawb kev sib pauv roj, tab sis nws kuj pab txhawb kev sib pauv dej noo ib yam. Tsis tas li ntawd, cov neeg zov lub hlwb tuaj yeem muaj cov duab sib txawv hauv cov nroj tsuag sib txawv. Ib txhia yog taum-puab thaum ib txhia yog elongated. Ntawm no, cov hlwb tiv thaiv ua haujlwm raws li osmotic siab. Yog li ntawd, cov dej muaj peev xwm thiab cov poov tshuaj ion concentration yog qhov tseem ceeb tshaj plaws uas tswj cov duab ntawm cov hlwb. Nyob rau hauv lem, qhov hloov pauv ntawm cov neeg zov lub hlwb txiav txim qhov qhib thiab kaw ntawm stomata. Thaum cov cell tiv thaiv ua flaccid, stomal qhib kaw. Tab sis, thaum tus neeg zov lub hlwb ua turgid, stomal qhib qhib raws li qhia hauv daim duab 02 saum toj no.
Dab tsi yog qhov zoo sib xws ntawm Stomata thiab Guard Cells?
- Stomata thiab Guard Cells yog cov qauv tseem ceeb hauv cov nroj tsuag.
- Ob lub qauv tswj hwm kev sib pauv roj thiab hloov pauv.
- Tsis tas li, ob leeg pom feem ntau ntawm nplooj.
- Tsis tas li ntawd, ob qho tib si, stomata thiab guard cells, ua haujlwm ua ke.
Qhov txawv ntawm Stomata thiab Guard Cells yog dab tsi?
Qhov sib txawv tseem ceeb ntawm stomata thiab guard cells yog tias lub stomata yog qhov pores thaum lub cell zov yog parenchyma hlwb pom hauv cov nroj tsuag. Txawm li cas los xij, lawv nyob ze nrog ib leeg thiab ua haujlwm ua ke. Cov kev hloov pauv ntawm cov neeg zov lub hlwb txiav txim siab qhib thiab kaw ntawm lub stomata. Thaum cov cell swells, stomata qhib. Ntawm qhov tod tes, thaum tus neeg zov lub hlwb qis, lub stomata kaw.
Cov infographic qhia hauv qab no muaj cov lus piav qhia ntxiv txog qhov sib txawv ntawm stomata thiab guard cells.
Summary – Stomata vs Guard Cells
Stomata thiab guard cells yog ob qho tseem ceeb hauv cov nroj tsuag. Lawv ua haujlwm ua ke kom ua tiav lawv txoj haujlwm. Qhov tseeb, qhov kev hloov pauv thiab qhov loj ntawm cov neeg zov lub hlwb tswj qhov qhib thiab kaw ntawm stomatal apertures. Yog li ntawd, lawv ob leeg ua ke pab txhawb cov pa pauv thiab hloov pauv hauv cov nroj tsuag. Txawm li cas los xij, stomata yog cov pores uas muaj feem ntau nyob rau hauv qis epidermis ntawm nplooj nplooj. Txawm li cas los xij, cov hlwb tiv thaiv yog cov parenchyma hlwb uas nyob ib puag ncig lub stomata. Li no, qhov no yog qhov txawv ntawm stomata thiab guard cells.
