Question

Correct sequence of events on larval development of Herdmania:

• A. A, C, D, B and E
• B. A, D, C, B and E
• C. B, A, C, E and D
• D. D, C, A, B and E

Hint:

Tail formation and notochord organisation must happen “inside” before the enzyme lets the larva “outside.”

Answer 1

The Correct Option is A

Step 1: Concept
Herdmania (a sea squirt) undergoes indirect development involving a free-swimming tadpole larva. Step 2--3: Analysis
Development begins with blastopore closing and tail bud formation (A). Archenteron produces mesoderm (C). The presumptive notochord organises the larva (D). Enzymes cause the chorion to rupture (B). The larva swims free (E).

Step 4: Conclusion
The sequence is A $\to$ C $\to$ D $\to$ B $\to$ E.

Final Answer: (A)