Q8 / 180 · AIIMS 2015 · Botany

Assertion : Branchiostoma and Balanoglossus are bilaterally symmetrical and triploblastic animals. Reason : They are exclusively marine and possess notochord.

  • 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.
  • Correct answer
    C
    If assertion is true but reason is false.
  • D
    If both assertion and reason are false.

Solution

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.

Hence, the correct answer is option: 'C'.

More Animal Kingdom Questions