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Consider the following.

I. Birds
II. Dust blowing
III. Rain
IV. Wind blowing

Which of the above spread plant diseases?

(a) I and III

(b) III and IV

(c) I, II and IV

(d) I, II, III and IV

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Correct option is (d) I, II, III and IV

Birds, rain and blowing of wind or dust can act as a medium or vector for the spread of plant pathogens, which cause various diseases.

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