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Gaokao Biology Practice Question

实验发现, 物质甲可促进愈伤组织分化出从苐; 乙可解除种子休眠; 丙浓度低时促进植 株生长, 浓度过高时抑制植株生长; 丁可促进叶片衰老。上述物质分别是生长素、脱落酸、 细胞分裂素和赤霉素四种中的一种。下列说法正确的是

  1. A.甲的合成部位是根冠、萎蓔的叶片
  2. B.乙可通过发酵获得
  3. C.成熟的果实中丙的作用增强
  4. D.夏季炎热条件下，丁可促进小麦种子发芽

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