Question:

Viroids were discovered by,

Updated On: Jul 7, 2022
  • Stanley
  • Ivanowsky,
  • Pasteur
  • Diener
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The Correct Option is D

Solution and Explanation

Viroids are the smallest infectious pathogens which are composed of circular single-stranded RNA without a protein coat. Viroids were first discovered and given this name by Theodor Otto Diener (1971) who was a plant pathologist works at Agricultural Research Centre in Maryland. The first viroid discovered was the Potato spindle tuber viroid (PsTVd) which cause disease in potato and some other solanaceae plants. D.J. Ivanowski was the discoverer of the virus.
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Concepts Used:

Biological Classification

The process of grouping living organisms into categories is called biological classification. The most modern 5-kingdom classification was put ahead by an eminent scientist R.H.Whittaker. The five-kingdom classification is based on the criteria like cell structure, mode of nutrition, body form, and reproduction. One of the most important characteristics of this system is that it follows the evolutionary sequence of living organisms. The organisms are classified into distinct taxa or levels like Kingdom, Phylum, Division, Class, Order, Family, Genus, and Species. The 5 kingdoms are as follows:

Biological Classification