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The phylum name Annelida is derived from the Latin word 'annulus'. What does 'annulus' refer to in the context of these animals?
The NCERT text states: 'Their body surface is distinctly marked out into segments or metameres and, hence, the phylum name Annelida (Latin, annulus: little ring)'.
Which of the following structures in aquatic annelids aids in swimming?
The NCERT text mentions: 'Aquatic annelids like Nereis possess lateral appendages, parapodia, which help in swimming'.
What type of circulatory system is found in Annelida?
The NCERT text explicitly states: 'A closed circulatory system is present' in Annelida.
What is the primary function of nephridia in Annelids?
The NCERT text declares: 'Nephridia (sing. nephridium) help in osmoregulation and excretion'.
Describe the neural system of Annelids.
The NCERT text states: 'Neural system consists of paired ganglia (sing. ganglion) connected by lateral nerves to a double ventral nerve cord'.
Which of the following annelids is correctly identified as monoecious?
The NCERT text says: 'Nereis, an aquatic form, is dioecious, but earthworms and leeches are monoecious'. Hirudinaria is a blood-sucking leech, hence monoecious.
Which of these anelids is an example of an aquatic, dioecious form?
The NCERT text states, 'Nereis, an aquatic form, is dioecious'.
Annelids are characterized by metameric segmentation. What does this mean?
The NCERT text explains: 'Their body surface is distinctly marked out into segments or metameres and, hence, the phylum name Annelida (Latin, annulus: little ring)'.
Which of the following is common to both Annelida and Arthropoda?
Both Annelida are described as 'metamerically segmented' and Arthropoda as 'segmented' in their respective sections and the summary table (Table 4.2). The other options are incorrect for Annelida (no notochord, closed circulatory system, no chitinous exoskeleton).
Identify the characteristic that distinguishes Annelida from Aschelminthes.
Aschelminthes are described as 'pseudocoelomate animals' while Annelida are 'coelomate animals'. Both phyla share bilateral symmetry, triploblastic nature, and organ-system level of organization.
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