- knolik
embryo sag
Значение термина embryo sag в knolik
embryo sag - embryo sag
embryo sag - Large oval cell in nucellus of ovule of flowering plants in which fertilization of egg and development of embryo occurs; female gametophyte containing a number of nuclei derived by division of megaspore nucleus. Number and arrangement of these differs in different forms but most commonly there is, at micropylar end, the egg-apparatus, consisting of egg nucleus and two others, synergidae; at opposite end three nuclei which become separated by cell walls forming antipodal cells, probably aiding in nourishment of young embryo; in centre, two polar nuclei which fuse to form primary endosperm nucleus. At fertilization one male nucleus fuses with egg nucleus forming a zygote which develops into embryo; second male nucleus fuses with primary endosperm nucleus to form endosperm nucleus, which divides to form endosperm.
Рядом со словом embryo sag в knolik
| embryo | В начало буква "" буквосочетание "" | embryology |
Статья про embryo sag была прочитана 286 раз
- - TOP 200
- - mycophyta
- - alloys furnaces
- - binomial nomenclature
- - alloys, bronze
- - ainley, henry hinchliffe
- - august 21
- - ranunculus trichophyllus chaix
- - ranunculus fluitans lamarck
- - ranunculus hederaceus l.
- - ranunculus heterophyllus weber
Our friends, knolik encyclopaedia knolik.com