Consider the following:

  1. Birds
  2. Dust blowing
  3. Rain
  4. Wind blowing

Which of the above spread plant diseases?

[UPSC Civil Services Exam – 2018 Prelims]

(a) 1 and 3 only

(b) 3 and 4 only

(c) 1, 2 and 4 only

(d) 1, 2, 3 and 4


Answer: (d)        

Explanation:

  • Birds can carry pathogens from one infected plant to another plant.
  • Some plant pathogenic bacteria are carried to short distance by wind.
  • Some bacteria are often disseminated by splashing of raindrops, as in case of Citrus canker disease.
  • In some places, rain seems to be more important than insects in disseminating the fire blight bacteria, by its washing or splattering effect of rain.
  • Soil and field operations also disseminate the diseases as they result in dust blowing

Consider the following statements:                                                                   The Parliament of India can place a particular law in the Ninth Schedule of the Constitution of India. The validity of a law placed in the Ninth Schedule cannot be examined by any court and no judgement can be made on it. Which of the statements given above is/are correct?

Consider the following statements:                                               

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Consider the following statements:                                                         The Parliament of India can place a particular law in the Ninth Schedule of the Constitution of India. The validity of a law placed in the Ninth Schedule cannot be examined by any court and no judgement can be made on it. Which of the statements given above is/are correct?

Consider the following statements:                                               

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