Ecology

• 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).

• Taxonomy of Root-Knot Nematodes (Meloidogyne):
• Type Species: The genus Meloidogyne was established by Emílio Augusto Goeldi in 1887.
• First Described Species: Goeldi described Meloidogyne exigua causing severe galls on the roots of coffee (Coffea arabica) in Rio de Janeiro, Brazil. Therefore, Meloidogyne exigua is the designated type species of the genus.
• Other Species: M. incognita, M. javanica, M. arenaria, and M. hapla were redescribed/established later by Chitwood (1949).
• Conclusion: Meloidogyne exigua is the type species of Meloidogyne (Option 3).

Correct option: (3) M. exigua

• Phytophagous Ladybird Beetles (Subfamily Epilachninae):
• Feeding Habit: While the vast majority of ladybird beetles (family Coccinellidae) are beneficial predators feeding on aphids, scales, and mealybugs, the subfamily Epilachninae contains strictly phytophagous (herbivorous) species.
• The Hadda Beetle: Epilachna vigintioctopunctata (28-spotted potato beetle) feeds voraciously on solanaceous and cucurbitaceous leaves (brinjal, potato, tomato), skeletonizing foliage by scraping chlorophyll.
• Predatory Coccinellids Listed: Adonia variegata, Illeis cincta (mycophagous on powdery mildew), and Propylea dissecta are beneficial.
• Conclusion: Epilachna vigintioctopunctata is the phytophagous ladybird beetle (Option 2).

Correct option: (2) Epilechna vigintioctopunctata