Nyob rau hauv angiosperms, lub nucellus muaj cov embryo sac thiab yog ib puag ncig los ntawm integuments.
Puas yog nucellus thiab embryo sac tib yam?
Nws muaj peb ntu: kev sib koom ua ke, tsim nws txheej txheej, nucellus (lossis seem ntawm megasporangium), thiab poj niam gametophyte (tsim los ntawm haploid megaspore) hauv nws qhov chaw. Tus poj niam gametophyte - tshwj xeeb hu ua megagametophyte- tseem hu ua lub hnab embryo hauv angiosperms.
Puas yog nucellus koom nrog hauv kev tsim lub hnab embryo?
Lub embryo sac tsim nyob rau hauv lub ovule ncig los ntawm lub nucellus, uas yog nyob rau hauv lem ncig los ntawm integuments. Ib lub cell ntawm nucellus raug meiosis los tsim plaub megaspores.
Nucellus yog dab tsi?
nucellus Lub mass ntawm cov ntaub so ntswg nyob rau hauv lub ovule ntawm ib tsob nrojuas muaj lub embryo sac. Tom qab fertilization, nws yuav absorbed los ntawm kev loj hlob embryo los yog pheej mus tsim ib tug perisperm. Qhov loj thiab cov duab ntawm nucellus yog ib qho kev kuaj mob ntawm qee hom.
Lub npe hu ua embryo sac?
: tus poj niam gametophyte ntawm cov noob cog muaj cov hnab nyias nyias nyob hauv lub nucellus uas muaj cov qe nucleus thiab lwm cov nuclei uas ua rau muaj qhov endosperm ntawm fertilization.
