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Which of the following statements (i – v) are incorrect ?

  1. Circulatory system in arthropods is of closed type.

  2. Parapodia in annelids helps in swimming.

  3. Phylum mollusca is the second largest animal phylum.

  4. Aschelminthes are dioecious.

A. (i) only

B. (iii) only

C. (i) and (iii)

D. (iii) and (iv)

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Correct Answer : A.


Circulatory system in arthropods is of open type i.e., blood does not flow in definite vessels. Irregular spaces known as lacunae or sinuses, filled with blood are present.

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