Which of the following is an adaptation for aerial mode of life in birds?
Birds have hollow (pneumatic) bones, which reduce body weight and facilitate flight.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Vertebrata - Cyclostomata and Pisces
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Which of the following is an example of a bony fish?
Labeo (Rohu) belongs to class Osteichthyes, which includes bony fishes.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Which of the following animals is an example of a urochordate?
Ascidia is a urochordate, where the notochord is present only in the larval stage.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Which of the following is an example of a cephalochordate?
Branchiostoma (also known as Amphioxus) is a cephalochordate characterized by the presence of a notochord throughout life.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Which characteristic differentiates Osteichthyes from Chondrichthyes?
Osteichthyes (bony fishes) have an air bladder to regulate buoyancy, whereas Chondrichthyes lack this feature.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Which of the following features is incorrect regarding birds?
Birds are homeothermic (warm-blooded), not poikilothermic (cold-blooded).
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Which of the following features is incorrect regarding Chondrichthyes?
Chondrichthyes (cartilaginous fishes) do not have an operculum (gill cover); it is a feature of bony fishes (Osteichthyes).
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Which of the following statements about reptiles is incorrect?
Reptiles do not have a diaphragm; their breathing is dependent on rib movements.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Which of the following statements about Osteichthyes is incorrect?
Osteichthyes (bony fishes) have an operculum, which covers and protects the gills.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Which of the following is an example of a cartilaginous fish?
Scoliodon (dogfish) is a cartilaginous fish belonging to class Chondrichthyes.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Which of the following animals belongs to class Cyclostomata?
Petromyzon (lamprey) is a jawless fish belonging to class Cyclostomata.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Which of the following is an incorrect statement about Osteichthyes?
Osteichthyes (bony fishes) have a two-chambered heart, not a three-chambered one.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces