Chordate Characteristics

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Questions and Answers

Which characteristic is NOT a fundamental feature of all chordates at some stage of their development?

  • Post-anal tail used for propulsion
  • Presence of mammary glands (correct)
  • Notochord for skeletal support
  • Dorsal hollow nerve cord

In which subphylum of Chordata is the notochord present throughout life, extending from head to tail?

  • Vertebrata
  • Cephalochordata (correct)
  • Tunicata
  • Urochordata

Which of the following is a key distinguishing feature between Chondrichthyes and Osteichthyes?

  • Presence of a vertebral column
  • Method of respiration through gills
  • Habitat in marine environments
  • Type of scales present on their body (correct)

What adaptation allows amphibians to thrive in both aquatic and terrestrial environments?

<p>Moist, glandular skin for cutaneous respiration (C)</p> Signup and view all the answers

Which of the following heart structures is characteristic of reptiles (excluding crocodiles)?

<p>Three-Chambered heart (C)</p> Signup and view all the answers

How do air sacs in birds contribute to their ability to fly?

<p>By increasing respiratory efficiency (D)</p> Signup and view all the answers

Which feature is unique to mammals compared to other vertebrate groups?

<p>Mammary glands for milk production (D)</p> Signup and view all the answers

What is the primary function of pharyngeal slits in protochordates like cephalochordates?

<p>Filter-feeding (D)</p> Signup and view all the answers

Which evolutionary adaptation is observed in Aves that significantly reduces their body weight to aid in flight?

<p>Loss of teeth and presence of a beak (C)</p> Signup and view all the answers

How does the presence of a swim bladder in Osteichthyes contribute to their survival?

<p>It helps in buoyancy regulation. (C)</p> Signup and view all the answers

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Flashcards

Post-Anal Tail

Extension of the chordate body beyond the anus used for propulsion.

Pharyngeal Slits

Openings in the pharynx used for filter-feeding or develop into other structures.

Notochord

A flexible rod providing skeletal support in chordates, derived from the mesoderm.

Dorsal Hollow Nerve Cord

A key characteristic of chordates; develops into the brain and spinal cord in vertebrates.

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Urochordata (Tunicata)

Chordates where the notochord is only in the larval tail.

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Cephalochordata

Small, fish-like marine animals with a notochord from head to tail.

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Vertebrata

Chordates with a vertebral column, replacing the notochord in adults.

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Cyclostomata

Jawless vertebrates, often ectoparasites on fish.

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Chondrichthyes

Cartilaginous fish with skeletons made of cartilage and placoid scales.

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Osteichthyes

Bony fish with skeletons made of bone, possessing an operculum and swim bladder.

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