Which wasp is parasitic on ootheca of cockroach?

A. Eulophid wasp

B. Ensign wasp

C. Braconid wasp

D. Sphecid wasp

Answer: Option B

Solution(By Examveda Team)

Ensign wasp is parasitic on ootheca of cockroach.
The female ensign wasps seek out cockroach egg cases, known as ootheca, where she will lay an egg in one of the cockroach eggs inside the egg case.
The wasp's egg hatches and the larva eats the egg which was laid. Successive instars of the larva eat the other eggs within the egg case.