4
Question
Choose the correct answers from the alternatives given.
The three defining characteristics of chordates are
Choose the correct answers from the alternatives given.
The three defining characteristics of chordates are
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Solution
The correct option is D gill arches or pharyngeal pouches/dorsal hollow nerve cord/notochord
In chordates, four common features appear at some point during development: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. The nerve cord is- Single, hollow nerve cord beneath the dorsal surface; in vertebrates, it differentiates into the brain and spinal cord. The notochord is a flexible rod on the dorsal side of the gut, present at one stage in all chordates; displaced in the vertebrates by the vertebral column that forms around the nerve cord. Pharyngeal slits (pouches) connect pharynx (between mouth and oesophagus) with outside. The post-anal tail extends beyond anus; present at least in embryo; regresses into tail bone in humans.
- So, the correct option is, 'gill arches or pharyngeal pouches/dorsal hollow nerve cord/notochord'.
In chordates, four common features appear at some point during development: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. The nerve cord is
- Single, hollow nerve cord beneath the dorsal surface; in vertebrates, it differentiates into the brain and spinal cord. The notochord is a flexible rod on the dorsal side of the gut, present at one stage in all chordates; displaced in the vertebrates by the vertebral column that forms around the nerve cord. Pharyngeal slits (pouches) connect pharynx (between mouth and oesophagus) with outside. The post-anal tail extends beyond anus; present at least in embryo; regresses into tail bone in humans.
- So, the correct option is, 'gill arches or pharyngeal pouches/dorsal hollow nerve cord/notochord'.
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