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植物组织培养的过程如下图所示。请分析并回答下列问题： (1)愈伤组织是由离体的组织或器官通过A_________过程获得的，B、C过程是通过细胞的_________实现的。 (2)胚状体根据其来源不同，可以分为“体细胞胚”和“花粉胚”。 ①．用花药离体培养可获得“花粉胚”，同种植物的花粉胚与体细胞胚在染色体数目上的主要区别是_______。 ②．如果用_________处理二倍体植物的花粉胚，能获得可育的植株，该过程是_______育种中不可缺少的步骤。 ③．在一定条件下培养离体细胞可以形成体细胞胚进而发育成完整的植株，其根本原因是每个细胞都含有_________，这一过程体现了________________。
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