种子的胚是由( )发育来的.A.受精极核B.卵细胞C.受精卵D.花
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C
植物开花,经过传粉和受精过程后,花萼、花冠、花蕊等结构一般都逐渐凋落,雌蕊的子房却慢慢膨大起来,具体发育情况为:可见,胚珠里面的受精卵发育成胚.故选:C
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