NEET 2017 · BiologyHemichordataPrevious Year Question
An important characteristic that Hemichordates share with Chordates is
Answer: (C) Pharynx with gill slits. Both hemichordates and chordates possess pharyngeal gill slits; in hemichordates respiration takes place through gills, while chordates are characterised by paired pharyngeal gill slits.
- A.Absence of notochord
- B.Ventral tubular nerve cord
- C.Pharynx with gill slits✓
- D.Pharynx without gill slits
Correct Answer
(C) Pharynx with gill slits
Solution & Explanation
Both hemichordates and chordates possess pharyngeal gill slits; in hemichordates respiration takes place through gills, while chordates are characterised by paired pharyngeal gill slits. A notochord is exclusive to chordates, and a ventral (solid, double) nerve cord is a non-chordate feature, so options (a), (b) and (d) are wrong. NCERT Reference: Page 46, line 4
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