2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Teb tiav: Cov spores germinate rau daim prothallus hauv pteridophytes. … Tus prothallus tau tsim thiab loj hlob cov kab mob sib deev uas tsim archegonia thiab flagellated phev antheridia. Cov phev ntab mus rau lub ova rau fertilization thiab tsim ib tug diploid zygote uas faib los ntawm mitosis los ua multicellular sporophyte.
hom kab mob twg yog tsim los ntawm pteridophytes?
Nyob rau hauv heterosporous Pteridophytes, cov spores yog ob hom-cov me me yog hu ua microspores los yog txiv neej spores uas tsim nyob rau hauv microsporangia, thaum lub spores loj hu ua megaspores los yog poj niam. spores uas tsim nyob rau hauv megasporangia. gametophyte. Cov megaspores tsim cov poj niam gametophytes.
Gametophytes ntawm pteridophytes germinate li cas?
Pteridophytes qhia qhov tseeb hloov pauv ntawm ntau tiam neeg. … Cov tiam gametophyte tsim gametes los ntawm mitosis. Cov spores yog tsim los ntawm sporangia nyob rau hauv cov spores niam hlwb. Cov spores no germinate thiab ua rau gametophytes.
Vim li cas cov spores ntawm pteridophytes feem ntau haploid?
Kev xaiv (a) Haploid yog qhov tseeb raws li cov fern spores yog haploid. > Thaum cov spores raug tsim, lawv nyob hauv cov sporophyte uas yog diploid. Yog li, cov spores yog tiag tiag haploid cov qauv nyob hauv cov qauv diploid sporophytic.
YYog pteridophytes haploid lossis diploid?
Lub ntsiab cog lub cev ntawmpteridophyte tsis yog haploid tab sis nws yog diploid vim nws tsim los ntawm diploid zygote.
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 cov kev tsim tawm no suav nrog kev tsim cov gemmule?
C) Asexual reproduction tshwm sim nyob rau hauv spongilla los ntawm kev loj hlob ntawm gemmules. Spongilla belongs rau Porifera Porifera Ib daim txhuam cev yog ib qho cuab yeej lossis kev pab tu ua los ntawm soft, porous khoom. Feem ntau siv los ntxuav qhov chaw impervious, sponges yog tshwj xeeb tshaj yog zoo ntawm absorbing dej thiab dej raws li kev daws teeb meem.
Nyob rau hauv pteridophytes meiosis tshwm sim thaum twg?
Meiosis tshwm sim hauv sporangia, nyob rau hauv qab ntawm nplooj sporophyte. Tom qab cov spores raug tso tawm lawv germinate, faib los ntawm mitosis thiab loj hlob mus rau hauv lub plawv zoo li gametophytes. … Lub embryo loj hlob mus rau sporophyte, tseem txuas nrog gametophyte.
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.
