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Questions and Answers
Which characteristic is true for Phylum Annelida?
Which characteristic is true for Phylum Annelida?
- Excretory system with multiple pairs of nephridia per somite
- Covered by a thick, dry & chitinous cuticle
- Bilaterally symmetrical & triploblastic worms (correct)
- Open circulatory system with no pseudohearts
How does respiration generally take place in Phylum Annelida?
How does respiration generally take place in Phylum Annelida?
- By lungs similar to mammals
- Through direct contact with the air
- By absorbing oxygen through the skin
- Simple diffusion through the epidermis or through the gills in aquatic forms (correct)
What is the composition of the circulatory system in Phylum Annelida?
What is the composition of the circulatory system in Phylum Annelida?
- Closed type with multiple pairs of hearts and no blood plasma
- Semi-closed type with one pseudoheart and no blood plasma
- Open type without any hearts and no blood plasma
- Closed type with pseudohearts and blood plasma containing dissolved haemoglobin (correct)
What is the structure of the nervous system in Phylum Annelida?
What is the structure of the nervous system in Phylum Annelida?
What is the mode of reproduction in Phylum Annelida?
What is the mode of reproduction in Phylum Annelida?
What type of symmetry do animals in Phylum Annelida exhibit?
What type of symmetry do animals in Phylum Annelida exhibit?
How is the musculature generally represented in animals of Phylum Annelida?
How is the musculature generally represented in animals of Phylum Annelida?
What is the composition of the body space between the body wall and alimentary canal in animals of Phylum Annelida?
What is the composition of the body space between the body wall and alimentary canal in animals of Phylum Annelida?
How does respiration generally take place in aquatic forms of Phylum Annelida?
How does respiration generally take place in aquatic forms of Phylum Annelida?
What is the mode of reproduction for animals in Phylum Annelida?
What is the mode of reproduction for animals in Phylum Annelida?
What type of symmetry do animals in Phylum Annelida exhibit?
What type of symmetry do animals in Phylum Annelida exhibit?
How is the circulatory system generally characterized in animals of Phylum Annelida?
How is the circulatory system generally characterized in animals of Phylum Annelida?
What is the mode of respiration generally observed in aquatic forms of Phylum Annelida?
What is the mode of respiration generally observed in aquatic forms of Phylum Annelida?
What is the composition of the body space between the body wall and alimentary canal in animals of Phylum Annelida?
What is the composition of the body space between the body wall and alimentary canal in animals of Phylum Annelida?
What is the general composition of the musculature in animals of Phylum Annelida?
What is the general composition of the musculature in animals of Phylum Annelida?
Flashcards
Annelida Symmetry
Annelida Symmetry
Annelids exhibit bilateral symmetry, meaning their body can be divided into mirror-image halves along a single plane.
Annelida Body Cavity
Annelida Body Cavity
Annelids have a true coelom, a body cavity lined with mesoderm tissue.
Annelida Musculature
Annelida Musculature
Annelids have both circular and longitudinal muscles in their body wall, enabling movement.
Annelida Respiration (Aquatic)
Annelida Respiration (Aquatic)
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Annelida Respiration (General)
Annelida Respiration (General)
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Annelida Circulatory System
Annelida Circulatory System
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Annelida Nervous System
Annelida Nervous System
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Annelida Reproduction
Annelida Reproduction
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Study Notes
Characteristics of Phylum Annelida
- Segmented body plan divided into metameres (segments), allowing for greater mobility and specialization.
- Bilateral symmetry is present, facilitating directional movement and organization of body structure.
Respiration in Phylum Annelida
- Generally occurs through the skin (cutaneous respiration) with oxygen absorption directly from the surrounding environment.
- Aquatic species often utilize gills for efficient gas exchange in water, enhancing respiration.
Circulatory System of Phylum Annelida
- Characterized by a closed circulatory system, where blood is contained within vessels, ensuring efficient transport of nutrients and oxygen.
- Presence of multiple hearts (aortic arches) in some species, which help in pumping blood throughout the body.
Nervous System Structure in Phylum Annelida
- Composed of a ventral nerve cord with segmental ganglia, which coordinate movement and sensory information.
- Cerebral ganglia function as a primitive brain, integrating sensory input and regulating behavior.
Reproduction in Phylum Annelida
- Asexual reproduction occurs through fragmentation in some species; most reproduce sexually with distinct male and female individuals.
- Some species are hermaphroditic, possessing both male and female reproductive organs, facilitating reproduction.
Musculature in Phylum Annelida
- Composed of circular and longitudinal muscle layers, allowing for coordinated movement and locomotion through contraction and relaxation.
- The musculature aids in burrowing and swimming, adapting to different environments.
Body Cavity Composition in Phylum Annelida
- Coelom is the body space between the body wall and alimentary canal, providing a hydrostatic skeleton for support and movement.
- The coelom is filled with coelomic fluid, allowing for better distribution of nutrients and waste products.
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