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?
question_subject: 
Science
question_year: 
2003
question_exam: 
CDS-I
stats: 
0,448,448,496,128,168,104