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Questions and Answers
What is the role of coelomic fluid in Annelids?
What is the role of coelomic fluid in Annelids?
- Serves as a protective barrier against predators
- Provides turgidity and acts as a hydrostatic skeleton (correct)
- Facilitates gas exchange and nutrient transport
- Aids in excretion and osmoregulation
Which characteristic is typical of the phylum Annelida?
Which characteristic is typical of the phylum Annelida?
- Closed circulatory system and external gills for gas exchange
- Segmented body and exoskeleton made of chitin
- Radially symmetrical body and incomplete digestive system
- Metameric body and bilateral symmetry (correct)
What is a distinguishing feature of leeches within the phylum Annelida?
What is a distinguishing feature of leeches within the phylum Annelida?
- Radial symmetry and lack of segmentation
- Absence of chitinous setae (correct)
- Incomplete digestive system
- Presence of external gills for respiration
How do Annelids typically perform respiratory gas exchange?
How do Annelids typically perform respiratory gas exchange?
What is the reproductive strategy commonly observed in Annelids?
What is the reproductive strategy commonly observed in Annelids?
What is the typical nervous system arrangement in Annelids?
What is the typical nervous system arrangement in Annelids?
Which class of annelids is characterized by a body with conspicuous segmentation, few setae per metamere, and no parapodia?
Which class of annelids is characterized by a body with conspicuous segmentation, few setae per metamere, and no parapodia?
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?
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?
What is the purpose of the clitellum in annelids like Lumbricus sp. (earthworm)?
What is the purpose of the clitellum in annelids like Lumbricus sp. (earthworm)?
In annelids, which part of the body is considered a true segment and usually projects over the mouth?
In annelids, which part of the body is considered a true segment and usually projects over the mouth?
Which part of the annelid body is covered by a thin, transparent cuticle secreted by underlying cells?
Which part of the annelid body is covered by a thin, transparent cuticle secreted by underlying cells?
What is the function of the alimentary canal's pharynx in annelids?
What is the function of the alimentary canal's pharynx in annelids?
In annelids, what lies beneath the grooves corresponding to the external segmentation?
In annelids, what lies beneath the grooves corresponding to the external segmentation?
What type of larva is usually present in annelids like Nereis sp.?
What type of larva is usually present in annelids like Nereis sp.?
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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.
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