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      Question

      In hybrid seed production male sterile lines are

      maintained by crossing with
      A A line Correct Answer Incorrect Answer
      B B line Correct Answer Incorrect Answer
      C R line Correct Answer Incorrect Answer
      D Pureline Correct Answer Incorrect Answer

      Solution

      The three-line system requires a cytoplasmic male sterile (A line), a maintainer (B line) and a restorer (R line) to produce F1 seeds

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