Potato spindle tuber disease is caused by
- Fungus
- Virus
- Bacterium
- Viroid
The Correct Option is D
Solution and Explanation
Potato spindle tuber disease is caused by viroid. It occurs in tomato and potato. This disease is caused by a viroid named as Potato Spindle Tuber Viroid (PSTVd). Viroids are single-stranded RNA molecules. They are considered to be the smallest plant pathogens ranging from 246 to 399 nucleotides.
PSTVd was the first viroid identified. It contains a small, circular RNA molecule similar to the Chrysanthemum stunt viroid. The natural hosts for these viroids are tomatoes and potatoes.
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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:
