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?

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]}

Option 1: I, II, and III are correct.

Statement I - This statement is incorrect. Not all nematodes are parasitic in nature. While some nematodes are parasites, there are also free-living nematodes that do not rely on a host for survival.

Statement II - This statement is correct. Earthworms are indeed nocturnal animals, meaning they are more active during the night.

Statement III - This statement is correct. Annelids, which include earthworms, do not have a true coelom. Instead, they have a fluid-filled cavity called a pseudocoelom.

Option 2: I and III are correct.

Statement IV - This statement is not included in this option. Therefore, it is not considered.

Option 3: IV only

Statement I - This statement is not included in this option. Therefore, it is not considered.

Statement II - This statement is not included in this option. Therefore, it is not considered.

Statement III - This statement is not included in this option. Therefore, it is not considered.

Statement IV - This statement is correct. The alimentary canal of flatworms, such as tapeworms, has only one opening that functions as both the mouth