What is the primary function of parapodia in Nereis?
Parapodia are lateral appendages in Nereis that help in swimming and locomotion.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Aschelminthes and Annelida
Phylum Aschelminthes and Annelida
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Which of the following is a key adaptation seen in parasitic helminths?
Parasitic helminths, such as tapeworms, exhibit high reproductive capacity to ensure survival despite host immune responses.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Aschelminthes and Annelida
Which of the following phyla includes animals that exhibit metamerism?
Annelids show true segmentation (metamerism), where the body is divided into repetitive segments.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Aschelminthes and Annelida
Which of the following animals lacks an excretory system?
Echinoderms, such as starfish, lack a specialized excretory system and rely on diffusion for waste removal.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Aschelminthes and Annelida
Which of the following animals belongs to phylum Mollusca?
Pinctada (pearl oyster) belongs to phylum Mollusca, which is characterized by a soft body and a calcareous shell.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Aschelminthes and Annelida
Which of the following animals is correctly matched with its mode of reproduction?
Pavo (peacock) is an oviparous bird, meaning it lays eggs.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Aschelminthes and Annelida
Which of the following characteristics is found in birds but not in mammals?
Birds are the only vertebrates that possess feathers, which aid in flight and insulation.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Aschelminthes and Annelida
Which excretory organ is present in Annelida?
Nephridia are the excretory organs in annelids, helping in osmoregulation and waste removal.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Aschelminthes and Annelida
Which of the following statements about cartilaginous fishes is correct?
Cartilaginous fishes lack a swim bladder, which is present in bony fishes.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Aschelminthes and Annelida
Which of the following is an example of a pseudocoelomate animal?
Aschelminthes (roundworms) have a pseudocoelom, a body cavity not lined entirely by mesoderm.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Aschelminthes and Annelida
Which of the following animals possesses a segmented body but lacks jointed appendages?
Earthworms belong to phylum Annelida and exhibit true segmentation but do not have jointed appendages like arthropods.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Aschelminthes and Annelida
Which of the following statements about mammals is correct?
Mammals have a diaphragm, a unique muscle that aids in respiration.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Aschelminthes and Annelida