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颈卵

颈卵

颈卵

1

Many forest tree species have multiple archegonia which , after fertilization produce a number of proembryos .

许多林木树种都有颈卵器，受精以后便产生许多原胚。

2

In gymnosperms , the egg into the neck with only one of the two sperm and egg fusion .

在裸子植物中，进入颈卵器的两个精子只有一个与卵融合。

3

In the neck for eggs produced in only one egg , sperm is produced in many long , curly and two of the sperm flagellum .

在颈卵器中只产生一个卵，而在精子器中产生许多长形卷曲而具二根鞭毛的精子。

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5

Most gymnosperms retain archegonia except for the most advanced genera Gnetum and Welwitschia.

除了买麻藤属和百岁兰属以外大多数裸子植物还保留有颈卵器。

7

Early archegonial development is already evident two weeks after pollination .

颈卵器的早期发育在授粉后两周内就业已明显。

8

(of mosses ) having the archegonia at the top of the stem .

（苔藓）主干顶端有颈卵器。

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