• Genome Architecture of Hepadnaviruses (e.g., Hepatitis B Virus):
• Mature extracellular virions (Dane particles) contain a unique circular, partially double-stranded DNA genome ($pprox 3.2\text{ kb}$):
• Minus ($-$) strand: Complete, full-length, covalently linked at its $5'$ end to the viral reverse transcriptase/polymerase protein.
• Plus ($+$) strand: Incomplete and variable in length ($50 - 80\%$ of the circle), creating a single-stranded gap region.
• Upon infecting a host hepatocyte, the viral polymerase completes the positive strand, converting it into covalently closed circular DNA (cccDNA).
• nalysis:
• (Partially double-stranded DNA): Correct.

Correct option: (3) Partially double-stranded DNA

• Biological Characteristics of Asfarvirus (ASFV):
• Virions are large icosahedral enveloped particles ($175 - 215\text{ nm}$). Claiming small-sized $20\text{ nm}$ virions is False (parvoviruses/picornaviruses are $20\text{ nm}$).
• Exceptionally stable in organic matter across a wide pH range ($pH\ 4.0 - 11.5$). True.
• Genome is a single molecule of linear, double-stranded DNA ($170 - 190\text{ kbp}$) with terminal inverted repeats. True.
• The only known DNA arbovirus, transmitted biologically by soft ticks of the genus Ornithodoros (O. moubata). True.
• nalysis:
• Statements (B), (C), and (D) are correct. Hence, Option 4 is correct.

• Diagnostic Mycological Features of Mucor:
• Fungi belonging to the order Mucorales:
• Apophyses: Absent in Mucor (columella joins directly to sporangiophore). True.
• Sporangia: Large, spherical/round ($50 - 300\ \mu\text{m}$). True.
• Sporangiophores: Can be branched. True.
• Rhizoids and Stolons: Completely absent in Mucor. In contrast, prominent root-like rhizoids are characteristic of Rhizopus (produced directly opposite sporangiophores at nodes) and Absidia (produced internodally between sporangiophores).
• nalysis:
• Statement 1 claims rhizoids are present in Mucor, which is not true, hence the correct answer.

• Cytokine Functions in Immunology:
• IL-1: Secreted by macrophages; acts as a (III) Proinflammatory mediator inducing fever, acute-phase proteins, and co-stimulating Th2 development.
• IL-2 (T cell growth factor): Secreted by activated Th1 cells; (I) Stimulates T cell proliferation and cytotoxicity (drives clonal expansion of cytotoxic T cells and NK cells).
• IL-4: Secreted by Th2 cells; (IV) Stimulates growth, activation, and differentiation of B cells, driving immunoglobulin class-switching to IgE and IgG1.
• Interferon-gamma (IFN-$\gamma$): Secreted by Th1 and NK cells; (II) Key mediator of cell-mediated immunity, strongly activating macrophages for intracellular pathogen clearance.
• Matching Result:
• (III), (B)-(I), (C)-(IV), (D)-(II). Hence, Option 2 is correct.