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1.The pollen grain germinates on a special extension of the carpel, the stigma, and double fertilization results in a diploid zygote and triploid (usually) endosperm nucleus.
花粉粒在柱头上萌发，双受精导致双倍体的合子和三倍体的胚乳形成。收藏指正
2.Two diploid gametes may fuse to give a tetraploid zygote, or gamete may develop directly by parthenogenesis.
两个二倍体配子融合可能产生一个四倍体合子，这样的配子也可以通过孤雌生殖直接发育而来。收藏指正
3.During the process of fertilization a zygote with the diploid set is produced.
通过受精作用使受精卵形成一个二倍体。收藏指正
4.An organism that is haploid throughout its life cycle except as a zygote, when it is diploid, as in many algae and fungi.
单元体一种在其整个生命循环过程中保持单倍体，而只有在海藻或真菌中作为合子才呈现二倍体状态的生物组织收藏指正
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