The Mansonia mosquito (vector of Brugian filariasis) differs from other mosquitoes in obtaining oxygen for its aquatic larvae through which unique mechanism?
- A Surface siphon breathing at the water surface
- B Piercing stems and roots of aquatic plants to extract dissolved oxygen ✓
- C Cutaneous respiration through the entire larval body wall
- D Gulping atmospheric air at night only
Correct answer: B. Piercing stems and roots of aquatic plants to extract dissolved oxygen
Explanation
Mansonia larvae and pupae possess a specially adapted siphon that pierces the stems and roots of aquatic plants (such as Pistia stratiotes — water lettuce) to extract dissolved oxygen, making them independent of the water surface. This unique feature makes conventional oil larviciding ineffective against Mansonia. Control requires removal of aquatic vegetation from water bodies. Mansonia mosquitoes transmit Brugia malayi (Malayan filariasis) and Brugia timori.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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