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    Question

    Potato spindle tuber disease is transmitted by:

    A Mechanical contact Correct Answer Incorrect Answer
    B Aphids Correct Answer Incorrect Answer
    C Nematodes Correct Answer Incorrect Answer
    D Whiteflies Correct Answer Incorrect Answer
    E Soil fungi Correct Answer Incorrect Answer

    Solution

    Potato spindle tuber viroid (PSTVd) spreads through contaminated tools or handling. Unlike viruses transmitted by vectors (options b-d), viroids lack capsids and rely on physical transfer.

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