• Esophageal Glands in the Genus Hoplolaimus:
• Tylenchid Pharyngeal Glands: Members of the order Tylenchida (including the lance nematode genus Hoplolaimus, family Hoplolaimidae) consistently possess 3 esophageal glands:

• One dorsal esophageal gland (DEG): Enlarged, opening into the lumen of the procorpus just behind the stylet knobs ($DGO$).
• Two subventral esophageal glands (SvEGs): Opening into the lumen of the median bulb (metacorpus).
  • Anatomical Overlap: In Hoplolaimus, all three glands form an extensive lobed mass that overlaps the intestine dorsally and laterally.

• Conclusion: There are 3 esophageal glands in Hoplolaimus (Option 1).

• Sexual Dimorphism in Wheat Seed Gall Nematode (Anguina tritici):
• Statement (I) is correct: Anguina tritici exhibits marked sexual dimorphism in adult stages. Mature adult females are large, obese, curved or spiral in shape ($3-5\text{ mm}$ long), with an enlarged prodelphic reproductive tract; adult males are distinctly smaller, slender, and possess an open leptoderan bursa and prominent curved copulatory spicules.
• Statement (II) is incorrect: There is pronounced sexual dimorphism, making statement II false.
• Conclusion: Statement (I) is correct but Statement (II) is incorrect (Option 3).

• Stylet Morphology Across Developmental Stages in Cyst Nematodes (Heterodera / Globodera):
• Juvenile Stages: Second-stage juveniles ($J_2$) hatch from eggs equipped with a robust, heavily sclerotized stylet used to penetrate host roots and induce syncytia.
• Third ($J_3$) and Fourth ($J_4$) Stages: During post-infection swelling, the developing $J_3$ and $J_4$ juveniles retain their stomatal stylet, which remains functional for continuous nutrient ingestion from the syncytium until the final molt.
• Conclusion: Statement (I) is incorrect but Statement (II) is correct (Option 4).

• Organ Systems Absent in Nematoda:
• Body Plan Characteristics: The phylum Nematoda features a tube-within-a-tube pseudocoelomate body plan possessing well-developed digestive, reproductive, nervous, and excretory systems.
• Absent Systems: Nematodes completely lack circulatory (blood vascular) and respiratory systems.
• Physiological Compensation: Gaseous exchange ($ ext{O}_2$ and $ ext{CO}_2$) occurs by simple cutaneous diffusion across the moist, permeable body wall and cuticle; transport of nutrients and hormones is achieved by convection of the pseudocoelomic fluid propelled by body flexions.
• Conclusion: Nematodes lack respiratory and circulatory systems (Option 4).

Correct option: (4) Respiratory and circulatory system