• Bursa (Caudal Alae) Morphology in Tylenchid Nematodes:
• Pair-by-Pair Matching:
• Bursa absent $\rightarrow$ (III) Atylenchus: In the primitive genus Atylenchus, males are characterized by the complete absence of caudal alae (bursa).
• Bursa lobed $\rightarrow$ (II) Eutylenchus: Possesses a distinctly lobed, narrow bursa.
• Bursa trilobed $\rightarrow$ (I) Dolichodorus: Males of the awl nematode genus Dolichodorus have an extraordinarily prominent, deeply divided trilobed bursa terminating posteriorly.
• Bursa covering complete tail $\rightarrow$ (IV) Tylenchorhynchus: In stunt nematodes, the bursa extends to and encloses the very tip of the tail, exhibiting a classic peloderan bursa.
• Correct Choice: Option 2 accurately matches (A)-(III), (B)-(II), (C)-(I), (D)-(IV).

Correct option: (2) (A) - (III), (B) - (1), (C) - (1), (D) - (IV)

• Common and Scientific Names of Agricultural Nematodes:
• Pair-by-Pair Matching:
• Foliar nematode $\rightarrow$ (III) Aphelenchoides ritzemabosi: The chrysanthemum foliar nematode causing characteristic angular interveinal leaf lesions.
• Burrowing nematode $\rightarrow$ (IV) Radopholus similis: Landmark migratory endoparasite causing banana toppling disease and black head.
• Rice root nematode $\rightarrow$ (I) Hirschmanniella oryzae: Major migratory endoparasitic pest of lowland and irrigated flooded rice.
• Sheath nematode $\rightarrow$ (II) Hemicycliophora: Ectoparasitic nematode possessing a loose, double cuticular sheath over the entire body.
• Correct Choice: Option 4 maps (A)-(III), (B)-(IV), (C)-(I), (D)-(II).

Correct option: (4) (A) - (III), (B) - (V), (C) - (1), (BD) - (I)

• Soil Preferences of Cereal Cyst Nematode (Heterodera avenae):
• Statement (I) is correct: Heterodera avenae (causal agent of 'Molya disease' of wheat and barley) shows a pronounced ecological adaptation for light-textured, sandy, and well-drained soils (such as in Rajasthan, Haryana, and Punjab), where adequate pore space and aeration facilitate active juvenile migration and root penetration.
• Statement (II) is incorrect: In heavy-textured clay soils or poorly drained waterlogged soils, low aeration and narrow soil micropores severely impede $J_2$ movement and egg hatching.
• Conclusion: Statement (I) is correct but Statement (II) is incorrect (Option 3).