Which of the following is an example of an annelid?
Pheretima (earthworm) is a segmented worm belonging to phylum Annelida.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Aschelminthes and Annelida
#segmented worms
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Which of the following statements about annelids is incorrect?
Annelids do not have Malpighian tubules; they use nephridia for excretion.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
Which of the following statements about annelids is correct?
Annelids exhibit metameric segmentation, meaning their body is divided into repetitive segments.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
Respiration in annelids mainly occurs through
Respiratory gas exchange in annelids occurs primarily via moist general body surface through cutaneous diffusion facilitated by thin highly vascularized epidermis covered by permeable cuticle and extensive subepidermal capillary network. Terrestrial lumbricid earthworms lack gills entirely relying exclusively on skin maintained moist by mucus requiring humid habitats nocturnal activity. Aquatic polychaetes often supplement cutaneous respiration with specialized appendages: parapodial branchiae dorsal cirri tentacular filaments increasing surface area. No lungs tracheae present. Efficient skin
Ref: NCERT Class 11 Biology Chapter 4: Annelida cutaneous respiration skin gills; Campbell
Annelids are characterized by
Phylum Annelida unequivocally diagnosed by true metameric segmentation also called metamerism where body divided linearly into serially repeated similar segments each containing identical sets of coelomic compartments bounded by septa, paired nephridia, ganglia of ventral cord, segmental vessels, musculature derived from teloblastic growth and chaetae. Segmentation permits regional tagmosis, redundancy, flexible locomotion via peristalsis and parapodia. External annulations often correspond to septa though loss occurs in leeches. Differs from pseudosegmentation of tapeworm strobila or arthropo
Ref: NCERT Class 11 Biology, Chapter 4: Annelida metameric segmentation; Campbell Biology 12th ed. Chapter 33
