Question

Which of the following animals has tube within tube type of body plan evolved along deuterostomic evolutionary line?

• A. Annelids
• B. Arthropods
• C. Echinoderms
• D. Molluscs

Answer 1

The correct option is A Annelids

• Deuterostomes are coelomates whose embryonic development produces a blastopore that later forms an anus, with a second opening forming the mouth.
  
• Members of Annelida onwards have a tube within the tube type of body plan. They have one-way guts with a mouth at one end and an anus at the other.
  

So, the correct option is 'Annelids'.