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Q: Which of the following is true about chordates?
  • A. Gill slits are absent
  • B. Notochord is absent
  • C. Post–anal tail is absent
  • D. Heart is ventral
Correct Answer: Option D - Characteristics of Chordates– • Single, hollow nerve cord beneath dorsal surface in vertebrates, it differentiate into brain and spinal cord. • Notochord - flexible rod on the dorsal side of gut, present at one stage in all chordates. • Pharyngeal slits (pouches) connect pharynx with outside. • Postanal tail extends beyond anus, present at least in embryo, regresses into tail bone in humans. • Segmentation - reflected in arrangement of muscles (somites) and in vertebral column (both mesoderm).
D. Characteristics of Chordates– • Single, hollow nerve cord beneath dorsal surface in vertebrates, it differentiate into brain and spinal cord. • Notochord - flexible rod on the dorsal side of gut, present at one stage in all chordates. • Pharyngeal slits (pouches) connect pharynx with outside. • Postanal tail extends beyond anus, present at least in embryo, regresses into tail bone in humans. • Segmentation - reflected in arrangement of muscles (somites) and in vertebral column (both mesoderm).

Explanations:

Characteristics of Chordates– • Single, hollow nerve cord beneath dorsal surface in vertebrates, it differentiate into brain and spinal cord. • Notochord - flexible rod on the dorsal side of gut, present at one stage in all chordates. • Pharyngeal slits (pouches) connect pharynx with outside. • Postanal tail extends beyond anus, present at least in embryo, regresses into tail bone in humans. • Segmentation - reflected in arrangement of muscles (somites) and in vertebral column (both mesoderm).