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Open Circulatory System

Which of the ...

Question

Which of the following has a closed circulatory system?

A

Molluscs

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B

Annelids

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C

Arthropods

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D

Platyhelminthes

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Solution

The correct option is B
Annelids

In a closed circulatory system, the blood pumped by the heart is always circulated through a closed network of blood vessels. As fluid is regulated in better ways, it is more advantageous. The closed circulatory system is present in Annelids and Chordates.

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Q. Open circulatory system is present in
(A) Arthropods (B) Annelids
(C) Chordates (D) Molluscs

Q. Which of the following are correct?
(i) Sponges : Cellular level of organisation
(ii) Cnidaria : Tissue level of organisation
(iii) Platyhelminthes : Organ level of organisation
(iv) Annelids, Arthropods, Molluscs, Echinoderms and Chordates : Organ system level of organisation.

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Q. Read the following statements and select the incorrect ones.
(i) Circulatory system in arthropods is of closed type.
(ii) Parapodia in annelids help in swimming.
(iii) Phylum Mollusca is the second largest animal phylum.
(iv) Aschelminthes are dioecious.

Q. Short answer type questions.
What characteristics distinguish arthropods from annelids and molluscs?

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