2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Photo by Janice Glime. Cov protonema yog ib qho elongate, xov zoo li cov qauv uas tsim los ntawm cov germinated spore ntawm mosses thiab ib co liverworts. Nyob rau hauv feem ntau liverwort nws yog thalloid.
YPuas yog protonema muaj nyob rau hauv liverworts?
Cov protonema feem ntau yog cov xov zoo li thiab muaj ceg tawv heev hauv mosses tab sis txo qis rau ob peb lub hlwb hauv feem ntau cov kab mob siab thiab hornworts. Cov theem protonema hauv liverworts feem ntau yog hu ua sporeling hauv lwm cov bryophytes (saib hauv qab Daim Ntawv thiab kev ua haujlwm).
Nyob hauv chav kawm twg ntawm cov nroj tsuag yog protonema tsim?
Thaum cov moss thawj zaug loj hlob los ntawm cov kab mob, nws pib ua cov kab mob uas ua rau ntev thiab cov ceg ntoo mus rau hauv ib qho chaw filamentous hu ua protonema, uas txhim kho mus rau hauv nplooj gametophore, cov neeg laus daim ntawv ntawm gametophyte hauvbryophytes.
Protonema tsim tawm li cas?
Ib tug protonema yog tsim thaum ib moss los yog liverwort spore germinates. Nyob rau hauv mosses nws feem ntau muaj ntsuab, branching filaments; tab sis nws yog thalloid (ib daim ntawv tiaj tus lossis disc ntawm cov hlwb) hauv Sphagnum thiab Andreaea, piv txwv li, thiab hauv ntau lub cev.
YPuas yog protonema pom hauv Pteridophytes?
Diploid thiab pom muaj nyob rau hauv pteridophytes. D. Haploid thiab pom nyob rau hauv pteridophyte. Lus Cim: Daim ntawv gametophyte qhia ntau theem kev loj hlob xws li cov spore, protonema, thiab gametophore, uas ua rau cov kab mob sib deev.
Pom zoo:
Nyob rau hauv angiosperms pollen yog tsim nyob rau hauv anthers ib feem ntawm?
Nyob rau hauv angiosperms, paj ntoos yog tsim los ntawm anthers ntawm the stamens hauv paj. Hauv gymnosperms, nws yog tsim nyob rau hauv microsporophylls ntawm microstrobili (txiv neej paj ntoos cones). Pollen muaj ib los yog ntau tshaj cov noob qoob loo thiab ib lub qe qe.
Yuav ua li cas txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau pom kev pom?
Txawm li cas los xij, corneal collagen cross-linking - cov txheej txheem qib siab tau pom zoo los ntawm US Food and Drug Administration (FDA) hauv xyoo 2016 - tuaj yeem txhim kho qhov pom kev hauv cov neeg mob txhua hnub nyoog. Corneal collagen cross-linking (CXL) tsis yog kho rau keratoconus, tab sis nws tuaj yeem pab tiv thaiv tus mob kom tsis txhob mob hnyav.
Nyob rau hauv vernalisation flowering nyob rau hauv cov nroj tsuag yog?
Vernalization (los ntawm Latin vernus, "ntawm lub caij nplooj ntoos hlav") yoginduction ntawm cov nroj tsuag flowering txheej txheem los ntawm raug rau lub caij txias ntawm lub caij ntuj no, los yog los ntawm ib qho khoom sib npaug.
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.
Leej twg yog bennie nyob rau hauv lub raisin nyob rau hauv lub hnub?
Beneatha Younger ("Bennie") Mama tus ntxhais thiab W alter tus muam. Beneatha yog ib tug neeg txawj ntse. Nees nkaum xyoo, nws mus kawm ntawv qib siab thiab kawm tau ntawv zoo dua li lwm cov Tsev Neeg Hluas. Qee qhov ntawm nws tus kheej kev ntseeg thiab kev xav tau ua rau nws nyob deb ntawm niam txiv.
