Question

Osphradium is present in_______.

• A. Asterias
• B. Ophiura
  
• C. Pila
• D. None of these

Answer 1

The correct option is C Pila

• Osphradium is an olfactory sense organ found in certain Molluscan animals, like - the Apple Snail (Pila).
• Pila has a single gill-like Osphradium that is positioned on the left side of the pulmonary chamber. It hangs from the roof of the mantle cavity, adjacent to the left nuchal lobe.
• This small organ is usually 6-7 mm long and is shaped like an elongated oval.
• The osphradium of Apple snail is bipectinate i.e. branched like a feather.