Chordata: Key Distinguishing Features — NEET Biology
✅ Asked in NEET 2023These are bilaterally symmetrical, triploblastic, coelomate with organ-system level of organisation. They possess a post anal tail and a closed circulatory system.
Chordates are uniquely identified by four defining characteristics: a dorsal hollow nerve cord (unlike invertebrates), pharyngeal gill slits (for respiration in aquatic forms), a post-anal tail, and a closed circulatory system. Students often confuse the dorsal nerve cord with the ventral nerve cord found in arthropods, or forget that gill slits are present even in embryonic stages of terrestrial chordates. The key trap is mixing up chordate features with general animal properties like bilateral symmetry or coelomate condition, which aren't unique to chordates. Remember: focus on the four exclusive chordate traits—especially the dorsal nerve cord and pharyngeal gill slits—to distinguish them from other phyla in classification questions.
This paragraph was tested 2 times in NEET.
Select the correct statements with reference to chordates: A. Presence of closed circulatory system; B. Presence of dorsal hollow nerve cord; C. Presence of paired pharyngeal gill slits; D. Presence of ventral heart; E. Pseudocoelomate condition NEET Year: NEET 2023
An important characteristic that hemichordates share with chordates is NEET Year: NEET 2017
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