megaspore 

  1. 名詞
大孢子, 胚胎囊
/此名詞複數為"megaspores"/

    
                        
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例句

                

                    
    
                                                    
  1. 
                                Within each ovule, a megaspore develops by mitosis into a megagametophyte.                            
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  2. 
                                One kind, the megasporangium, produces only a single large spore (a megaspore ).                            
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  3. 
                                The remaining megaspore nucleus divides 3 times to produce a cell with 8 nuclei.                            
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  4. 
                                The transition to seeds continued with this megaspore being "boxed in" to its sporangium while it germinates.                            
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                                It is reported that sterility of giant reed is as a result of a failure of the megaspore mother cell to divide.                            
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