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Q: Which group of animals has a body wall that is made up of circular and longitudinal muscle fibres both, surrounded by a moist, cellular cuticle that is secreted by an epidermal epithelium?
  • A. Arthropoda
  • B. Annelida
  • C. Coelenterata
  • D. Platyhelminthes
Correct Answer: Option B - Annelids are segmented worms that have setae or parapodia for locomotion and a moist cuticle that is secreted by an epidermal epithelium. They also have circular and longitudinal muscle fibres that help them move and change shape.
B. Annelids are segmented worms that have setae or parapodia for locomotion and a moist cuticle that is secreted by an epidermal epithelium. They also have circular and longitudinal muscle fibres that help them move and change shape.

Explanations:

Annelids are segmented worms that have setae or parapodia for locomotion and a moist cuticle that is secreted by an epidermal epithelium. They also have circular and longitudinal muscle fibres that help them move and change shape.