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Topics in NEET Zoology
Organisms with bilateral symmetry and no true body cavity belong to which phylum?
Correct Answer:
A. Platyhelminthes
EXPLANATION
Platyhelminthes (flatworms) display bilateral symmetry and have no coelom (body cavity), distinguishing them from higher phyla.
The notochord is replaced by the vertebral column in:
Correct Answer:
C. Only in adult vertebrates
EXPLANATION
In adult vertebrates, the notochord is replaced by the vertebral column during embryonic development, though the notochord persists in some lower chordates.
Which of the following is NOT a characteristic of arthropods?
Correct Answer:
C. Closed circulatory system
EXPLANATION
Arthropods have an open circulatory system, not closed. They are characterized by jointed appendages, chitinous exoskeleton, and segmented bodies.