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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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