A learner makes a note: a small marine suspension feeder captures particles using a crown of ciliated tentacles around the mouth. The missing scientific idea is:

Correct Answer: B

lophophore

Lophophorates possess a lophophore, a ciliated tentacular feeding structure used for suspension feeding. Brachiopods and bryozoans are common examples. This MCQ belongs to the Lophophorates topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.