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Question: Answered & Verified by Expert
Assertion : Branchiostoma and Balanoglossus are bilaterally symmetrical and triploblastic animals.
Reason : They are exclusively marine and possess notochord.
BiologyAnimal KingdomAIIMSAIIMS 2015
Options:
  • A If both assertion and reason are true and reason is the correct explanation of assertion.
  • B Ifboth assertion and reason are true but reason is not the correct explanation of assertion.
  • C If assertion is true but reason is false.
  • D If both assertion and reason are false.
Solution:
1636 Upvotes Verified Answer
The correct answer is: If assertion is true but reason is false.
Balanoglossus (Phylum-Hemichordata) and Branchiostoma (= Amphioxus, Subphylum - Cephalochordata) both are bilaterally symmetrical and triploblastic animals. Both are marine animals. Balanoglossus does not possess a notochord whereas Branchiostoma being a chordate possesses notochord that persists throughout life.

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