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Viroids are infectious agents made of low-molecular-weight RNA. They lack the protein coat found in viruses and were discovered by T. O. Diener.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Viruses Viroids Prions and Lichens
Rust fungi such as Puccinia are Basidiomycetes. Karyogamy and meiosis occur in a basidium, and basidiospores are produced externally on it.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Fungi - Phycomycetes Ascomycetes Basidiomycetes
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