Sample Questions — Platyhelminthes
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MCQ
Which of the following statements are correct regarding platyhelminthes?
I. They are acoelomate and bilaterally symmetrical.
II. They show organ-system level of organisation.
III. They possess both excretory and circulatory systems.
IV. Some show high regeneration capacity.
✅ Correct Answer: D
They lack circulatory system, but have organ-level systems, bilateral symmetry, and some regenerate (e.g., Planaria).
MCQ
An animal has dorsoventrally flattened body and hooks and suckers. Identify the correct phylum:
✅ Correct Answer: D
The description corresponds to a tapeworm with attachment organs (hooks and suckers), a trait seen in parasitic flatworms.
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MCQ
Assertion (A): Platyhelminthes show bilateral symmetry and dorsoventral flattening.
Reason (R): These features allow better tissue differentiation and cephalisation.
✅ Correct Answer: A
Bilateral symmetry allows for distinct anterior-posterior axes and better movement, supporting cephalisation.
MCQ
Which of the following statements explains the evolutionary significance of bilateral symmetry in flatworms?
✅ Correct Answer: B
Bilateral symmetry facilitates cephalisation—concentration of sense organs toward the front.
MCQ
Which of the following best explains why Platyhelminthes are considered acoelomates?
✅ Correct Answer: B
Platyhelminthes do not possess a body cavity (coelom) at all, hence classified as acoelomates.
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