14 Questions
What is the role of coelomic fluid in Annelids?
Provides turgidity and acts as a hydrostatic skeleton
Which characteristic is typical of the phylum Annelida?
Metameric body and bilateral symmetry
What is a distinguishing feature of leeches within the phylum Annelida?
Absence of chitinous setae
How do Annelids typically perform respiratory gas exchange?
Through skin, gills, or parapodia
What is the reproductive strategy commonly observed in Annelids?
Hermaphroditic or separate sexes; asexual reproduction by budding in some
What is the typical nervous system arrangement in Annelids?
Double ventral nerve cord and ganglia with lateral nerves in each metamere
Which class of annelids is characterized by a body with conspicuous segmentation, few setae per metamere, and no parapodia?
Class Oligochaeta
Which class of annelids is known for having a body with a fixed number of segments, oral and posterior suckers, and the presence of a clitellum?
Class Hirudinea
What is the purpose of the clitellum in annelids like Lumbricus sp. (earthworm)?
Reproduction
In annelids, which part of the body is considered a true segment and usually projects over the mouth?
Prostomium
Which part of the annelid body is covered by a thin, transparent cuticle secreted by underlying cells?
Body wall
What is the function of the alimentary canal's pharynx in annelids?
Digestion
In annelids, what lies beneath the grooves corresponding to the external segmentation?
Septa
What type of larva is usually present in annelids like Nereis sp.?
Trochophore larva
Study Notes
Annelid Characteristics
- Coelomic fluid in Annelids functions as a hydrostatic skeleton, providing support and movement.
- A typical characteristic of phylum Annelida is the presence of segmented bodies.
Respiratory System
- Annelids typically perform respiratory gas exchange through their moist skin.
Reproduction
- The reproductive strategy commonly observed in Annelids is hermaphroditism, where individuals possess both male and female reproductive organs.
Nervous System
- The typical nervous system arrangement in Annelids consists of a ventral nerve cord and a pair of ganglia in each segment.
Classes of Annelids
- Class Oligochaeta is characterized by a body with conspicuous segmentation, few setae per metamere, and no parapodia.
- Class Hirudinea is known for having a body with a fixed number of segments, oral and posterior suckers, and the presence of a clitellum.
Clitellum
- The purpose of the clitellum in annelids like Lumbricus sp. (earthworm) is to secrete a mucus ring during reproduction, which holds the worms together.
Body Structure
- The prostomium is the part of the annelid body considered a true segment and usually projects over the mouth.
- The annelid body is covered by a thin, transparent cuticle secreted by underlying cells.
Alimentary Canal
- The pharynx in the alimentary canal of annelids functions as a muscular tube that helps in food ingestion.
Body Segmentation
- The coelom lies beneath the grooves corresponding to the external segmentation in annelids.
Larval Development
- A trochophore larva is usually present in annelids like Nereis sp.
Test your knowledge on the characteristics of the Annelida phylum, which includes earthworms, freshwater worms, and leeches. Questions cover body structure, muscle layers, presence of setae, and coelom development.
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