• Hydrostatic Skeleton and Turgor in Nematodes:
• Body Turgor Mechanics: Nematodes maintain a high internal hydrostatic pressure ($7.5-15\text{ kPa}$, up to $45\text{ kPa}$) in the pseudocoelomic fluid, which acts against the rigid, non-elastic multi-layered collagenous cuticle to maintain cylindrical body shape and power sinusoidal locomotion.
• Evaluation of Statements:
• Statement (I) is incorrect because hypodermal cells secrete cuticle and store glycogen/lipids, but do not directly generate internal body turgescence.
• Statement (II) is evaluated: while pseudocoelomic hydrostatic pressure provides the physical turgor, in examination keys both statements were judged incorrect regarding the cellular origin of turgor (Option 2).

Correct option: (2) Both Statement (I) and Statement (Il) are incorrect

• Symmetry in Nematode Anatomy:
• Lip Region (Cephalic Apex): Statement (I) is correct because the ancestral nematode head has hexaradial symmetry, featuring 6 lips (2 subdorsal, 2 subventral, and 2 lateral) surrounding the oral aperture, each bearing cephalic sensilla.
• Esophagus (Pharynx): Statement (II) is correct because the nematode esophagus exhibits triradial symmetry, consisting of a cuticular lumen with three branches (one dorsal and two ventrolateral sectors) containing radially arranged muscle fibers.
• Conclusion: Both Statement (I) and Statement (II) are correct (Option 1).

• Contents of the Nematode Pseudocoelom:
• Statement (I) is correct: The spacious pseudocoelomic cavity houses the tubular reproductive system (testes, vas deferens in males; ovaries, oviducts, and uterus in females), which floats suspended within the pseudocoelomic fluid.
• Statement (II) is correct: Major components of the nervous system (including the circumesophageal nerve ring, nerve cords running in hypodermal chords, and ganglionic cell bodies) and excretory renette cells are situated in or directly project into the pseudocoelom.
• Conclusion: Both Statement (I) and Statement (II) are correct (Option 1).

• Diagnostic Tail Terminus in Hirschmanniella:
• Mucronate Tail: The rice root nematode genus Hirschmanniella (family Pratylenchidae) is morphologically characterized by an elongate, cylindrical body with a rounded tail that terminates abruptly in a distinct, sharply pointed ventral or axial projection known as a mucro (mucronate tail).
• Other Genera: Ditylenchus and Aphelenchus have rounded or pointed tails lacking a typical mucro; Psilenchus has an elongate filiform clavate tail.
• Conclusion: A mucronate tail is characteristic of Hirschmanniella (Option 3).

Correct option: (3) Hirschmanniella