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Consider the following : 1. Birds 2. Dust blowing 3. Rain 4. Wind blowing Which of the above spread plant diseases ?

  1. (a)1 and 3 only
  2. (b)3 and 4 only
  3. (c)1, 2 and 4 only
  4. (d)1, 2, 3 and 4
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Official answer(d) 1, 2, 3 and 4