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3．（ 6分）番茄幼苗在缺镁的培养液中培养一段时间后，与对照组相比，其叶 片光合作用强度下降，原因是（ ）

Gaokao · Biology · previous-year question

  1. A.光反应强度升高，暗反应强度降低
  2. B.光反应强度降低，暗反应强度降低
  3. C.光反应强度不变，暗反应强度降低
  4. D.光反应强度降低，暗反应强度不变

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