Consider the following statements: I. All nematodes are parasitic in nature II. Earthworms are nocturnal animals III. Annelids have no true coelom. IV. The alimentary canal of flatworms has only one opening. Which of these statements is/are correct?

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Q: 114 (CDS-I/2003)
Consider the following statements:
I. All nematodes are parasitic in nature
II. Earthworms are nocturnal animals
III. Annelids have no true coelom.
IV. The alimentary canal of flatworms has only one opening.
Which of these statements is/are correct?
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question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,21,23,21,7,8,8

keywords: 

{'nematodes': [0, 0, 1, 0], 'flatworms': [0, 0, 2, 0], 'earthworms': [1, 0, 2, 1], 'annelids': [0, 0, 2, 0], 'true coelom': [0, 0, 1, 0], 'alimentary canal': [0, 0, 1, 0], 'iv': [6, 110, 77, 8], 'nocturnal animals': [0, 0, 1, 0]}