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The agent is a viroid. T. O. Diener discovered viroids while studying potato spindle tuber disease. Viroids consist of free RNA of low molecular weight and lack the protein coat found in viruses.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Viruses Viroids Prions and Lichens
T. O. Diener discovered the viroid in 1971 while studying potato spindle tuber disease. The infectious agent was smaller than viruses and consisted of low-molecular-weight RNA without a protein coat.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Viruses Viroids Prions and Lichens
Albugo is a member of Phycomycetes and occurs as a parasitic fungus on mustard. Other examples of this fungal class include Mucor and Rhizopus.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Fungi - Deuteromycetes and Economic Importance
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