Hemichordata & Chordata (Basis) — NEET Biology MCQs with Solutions
Free NEET Biology Hemichordata & Chordata (Basis) MCQs with step-by-step solutions (6 questions). Part of Animal Kingdom. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Hemichordata & Chordata (Basis) · easy · theory
The three fundamental chordate characters present at some stage are:
A. Radula, mantle and shell
B. Water vascular system and tube feet
C. Ventral solid nerve cord and open circulation
D. Notochord, dorsal hollow nerve cord, and pharyngeal gill slits ✓ Correct
Solution: All chordates possess a notochord, a dorsal hollow nerve cord, and paired pharyngeal gill slits at some life stage.
Q2 — Hemichordata & Chordata (Basis) · easy · theory
Hemichordates were once placed with chordates but are now a separate phylum because they possess only a:
A. Cranium
B. True notochord throughout life
C. Vertebral column
D. Rudimentary structure (stomochord), not a true notochord ✓ Correct
Solution: The "stomochord" of hemichordates is not a true notochord, so they are placed in a separate phylum near the echinoderm–chordate line.
Q3 — Hemichordata & Chordata (Basis) · medium · theory
The chordate subphyla Urochordata and Cephalochordata are together called:
A. Protochordata (invertebrate chordates) ✓ Correct
B. Vertebrata
C. Gnathostomata
D. Agnatha
Solution: Urochordata (e.g. Ascidia) and Cephalochordata (Amphioxus) are the protochordates — lower chordates.
Q4 — Hemichordata & Chordata (Basis) · medium · theory
In which subphylum is the notochord present only in the larval TAIL, disappearing in the adult?
A. Vertebrata
B. Cephalochordata
C. Hemichordata
D. Urochordata ✓ Correct
Solution: In Urochordata (tunicates) the notochord is restricted to the larval tail and is lost in the sessile adult.
Q5 — Hemichordata & Chordata (Basis) · hard · theory
In Vertebrata, the notochord during development is ______ by a ______:
A. Converted into; gill slits
B. Replaced; cartilaginous or bony vertebral column ✓ Correct
C. Retained unchanged; nerve cord
D. Enlarged into; a stomochord
Solution: All vertebrates possess a notochord embryonically, which is later replaced by the vertebral column enclosing the nerve cord.
Q6 — Hemichordata & Chordata (Basis) · hard · theory
Which correctly distinguishes Cephalochordata from Urochordata?
A. Cephalochordates lose the notochord as adults
B. Urochordates have a persistent full-length notochord
C. Both have vertebral columns
D. In Cephalochordata the notochord extends from head to tail and persists throughout life ✓ Correct
Solution: In Amphioxus (Cephalochordata) the notochord runs the whole body length and persists lifelong, unlike urochordates.