Gymnosperms tsis muaj qhov tseeb lossis qhov tseeb endosperm. Nyob rau hauv lawv, ob fertilization tsis pom. … Xws li ib qho endosperm ntawm gymnosperms yog ib yam khoom ntawm pre-fertilization ntaub so ntswg thiab yog haploid. Nws tuaj yeem sib npaug rau tus poj niam gametophyte li no lub haploid xwm.
YPuas yog endosperm muaj nyob rau hauv gymnosperm?
Teb tiav: Lub endosperm ntawm gymnosperm yog a haploid cov ntaub so ntswg. Nyob rau hauv gymnosperm, muaj ob lub phev nuclei uas ib tug degenerates thiab lub endosperm tsim tsis yog ib tug tiag tiag endosperm tab sis ib tug noj qab haus huv cov ntaub so ntswg rau kev loj hlob thiab germination ntawm lub embryo. … Cov endosperm hauv gymnosperm yog tsim ua ntej fertilization.
YPob angiosperms puas muaj endosperm?
Feem ntau cov angiosperms muaj Polygonum-hom embryo sac nrog ob lub hauv paus ntsiab lus thiab tsim ib qho triploid (3n) endosperm ib yam li hauv Arabidopsis. Nyob rau hauv ob peb hom, ntau tshaj li ob tug polar nuclei muaj nyob rau hauv lub hauv paus cell ua rau tsim ntawm endosperm nrog ib tug ploidy siab tshaj 3n [3].
Hom endosperm twg muaj nyob hauv gymnosperms?
Lub endosperm ntawm gymnosperms yog haploid. Nws yog cov ntaub so ntswg ua ntej fertilization thiab sib npaug rau poj niam gametophyte, yog li nws yog haploid nyob rau hauv qhov tab sis nyob rau hauv angiosperms nws yog post-fertilization cov ntaub so ntswg thiab feem ntau yog triploid nyob rau hauv xwm.
Pob gymnosperms thiab angiosperms puas muaj endosperm?
Gymnosperms. Gymnosperm noob feem ntau configured li cones. … Cov yam ntxwv uas txawv angiosperms los ntawmgymnosperms suav nrog paj, txiv hmab txiv ntoo, thiab endosperm hauv cov noob.
