2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Lycopodium yog homosporous- tag nrho cov spores yog roughly sib npaug ntawm qhov loj . Selaginella thiab Isoetes yog heterosporous heterosporous Megaspores, tseem hu ua macrospores, yog ib hom spore uas muaj nyob rau hauv heterosporous nroj tsuag. Cov nroj tsuag no muaj ob hom spores, megaspores thiab microspores. Feem ntau hais lus, lub megaspore, los yog loj spore, germinates rau hauv ib tug poj niam gametophyte, uas tsim qe hlwb. https://en.wikipedia.org › wiki › Megaspore
Megaspore - Wikipedia
--spores yog ob qhov sib txawv, microspores thiab megaspores. Cov phau ntawv qhia feem ntau piav qhia txog Selaginella raws li cov nroj tsuag uas xav tau cov dej tsis tu ncua.
hom spores dab tsi Selaginella tsim?
Selaginella tsim ob hom spores- megaspores thiab microspores. Tus mob dimorphic ntawm cov spores yog hu ua heterospory. Nyob rau hauv nruab nrab ntawm lub sporophyll thiab sporangium yog tam sim no membranous qauv hu ua ligule piv txwv li, lub sporophyll zoo ib yam li cov nplooj vegetative.
Puas Selaginella tsim ob hom spores?
Hauv qhov sib piv rau Lycopodium, cov sporophytes ntawm tag nrho cov spike mosses (Selaginella) muaj sporophylls nyob hauv strobili, thiab txhua hom Selaginella yog heterosporous; uas yog, lawv tsim spores ntawm ob qhov ntau thiab tsawg, qhov loj dua li megaspores thiab me me li microspores.
Yuav ua li cas spores dispersed nyob rau hauv Selaginella?
Spores of thegenus Selaginella yog tso tawm los ntawm kev tawm dag zog los ntawm kev sib txawv ntawm lub cev ntawm sporangium. … Microspores ncav cuag li 5–6 cm los ntawm qhov chaw spores, thaum megaspores mus txog li 65 cm los ntawm qhov chaw, nrog ib tug dav dav dav ntawm 21.3 cm.
Sporangia koom nrog Selaginella li cas?
Cov sporangium nyob rau hauv cov sporophylls thiab cov sporophylls yog tau cog lus kom tsim cov cones lossis strobili. Strobilus: Tag nrho cov hom ntawm Selaginella tsim strobili los yog cones. … Selaginella yog heterosporous thiab, yog li ntawd, sporangia yog ob hom viz., microsporangia thiab megasporangia.
Pom zoo:
Puas yog kev sib ntaus sib tua ntawm kev sib ntaus sib tua?
Kev sib ntaus sib tua ntawm Hastings, uas Anglo-Saxon huab tais Harold II tau sim tiv thaiv nws lub tebchaws los ntawm kev tawm tsam ntawm William, duke ntawm Normandy (tom qab hu ua William tus Conqueror), tau tshwm sim rau 14 October 1066.
Puas yog kev sib raug zoo ntawm lub cev ua rau muaj kev sib raug zoo?
Thaum kev sib raug zoo ntawm lub cev yog ib qho tseem ceeb hauv kev sib koom ua ke romantic - nws yog ib qho tseem ceeb uas ua rau nws sib nrug ntawm lwm hom kev sib raug zoo - txhawb kev sib raug zoo ntawm kev sib raug zoo ib yam li, yog tias tsis ntau, tseem ceeb.
Kev sib raug zoo tsis sib xws cuam tshuam li cas rau kev hloov pauv?
Raws li qhov kev ntxub ntxaug yog cov noob caj noob ces, evolution feem ntau yog qhov tshwm sim. Kev sib tw tsis sib xws tuaj yeem ua raws li cov txheej txheem ntxiv rau kev xaiv ntuj tsim kom muaj kev hloov pauv. Txhua qhov kev tawm mus los ntawm kev sib raug zoo sib xws ua rau muaj kev sib npaug ntawm cov genotypes hauv cov pejxeem.
Puas yog kev sib tw tsis sib xws tib yam li kev sib xyaw ua ke?
Kev txwv tsis pub sib tw yog qee zaum xav tias yog tshwj xeeb ntawm kev sib xyaw inhibition. Hauv kev sib xyaw inhibition, tus inhibitor khi rau ib qho chaw allosteric, piv txwv li ib qhov chaw sib txawv ntawm qhov chaw nquag uas lub substrate khi.
Puas cov sib tov sib xyaw ua ke muaj cov khoom sib xws?
Ib homogeneous sib tov yog sib tov nyob rau hauv uas muaj pes tsawg leeg yog uniform thoob plaws qhov sib tov .. Qee cov ntaub ntawv hais ntxiv tias cov tshuaj lom neeg tsis tuaj yeem muab cais rau hauv nws cov ntsiab lus los ntawm kev sib cais ntawm lub cev, piv txwv li, tsis muaj kev cuam tshuam tshuaj lom neeg.
