micropyle

/mahy-kruh-pahyl/US // ˈmaɪ krəˌpaɪl //UK // (ˈmaɪkrəʊˌpaɪl) //

麦芽糖,微孔板,麦芽糖浆,麦芽糖体

Definitions

n.名词 noun

1
- : Zoology. any minute opening in an ovum through which a spermatozoon can enter, as in many insects.
- : Botany. the minute orifice or opening in the integuments of an ovule.

If I have time I will have another look at pollen-tubes, as, from what you say, they ought to find their way to the micropyle.
The embryo e, with its suspensor, is contained in the sac, the radicle pointing to the micropyle m.
The base of the nucellus is indicated by the chalaza ch, while the apex is at the micropyle m.
Hence, by ascertaining the position of the micropyle and chalaza, the two extremities of the embryo can in general be discovered.
It has been already stated that the radicle of the embryo is directed to the micropyle, and the cotyledons to the chalaza.