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    Question

    The substance which causes a definite change in genes is

    called ................?
    A Alkaloid Correct Answer Incorrect Answer
    B Toxin Correct Answer Incorrect Answer
    C Cytotoxin Correct Answer Incorrect Answer
    D Mutagene Correct Answer Incorrect Answer

    Solution

    The substance which causes a definite change in genes is called "mutagen." Mutagens are agents such as chemicals, radiation, or viruses that can alter the genetic material (DNA) in an organism, leading to mutations. 

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