Paramecia use cilia for locomotion and for gathering organic matter. How are rotifers similar?

Question

A.  Rotifers are single-celled protists
B.  The corona is made of cilia, and used for swimming and feeding.
C.  Rotifers and ciliates are thought to have given rise to all other animal phyla.
D.  Both lack a gut.

Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?

Gather Content
· What do you already know about rotifers and ciliates?

Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?

Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?

Answer 1

B.  The corona is made of cilia, and used for swimming and feeding.

Clarify Question
· What is the key concept addressed by the question?
        o This question addresses rotifers and ciliates.
· What type of thinking is required?
        o This question is asking you to take what you already know and apply it to this unfamiliar situation.

Gather Content
· What do you already know about rotifers and ciliates?
        o Rotifers are tiny, bilateral, unsegmented pseudocoelomates. Their ancestors may have resembled flatworms, with which they are classified in the spiralian Platyzoa.
        o At 50 to 500 mm long, rotifers are smaller than some ciliate protists. But they have complex bodies with three cell layers, highly developed internal organs, and a complete gut.
        o The corona, a conspicuous ring of cilia at the anterior end, is used for locomotion, and its cilia also sweep food into the rotifer’s mouth. Once food is swallowed, it is crushed with a complex jaw in the pharynx.

Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
        o Like paramecia, rotifers use cilia for both swimming and feeding.

Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
        o The question required you to take what you already know and apply it to this unfamiliar situation.
        o Did you recognize that rotifers use the ciliated corona for both locomotion and feeding?