An open circulatory system is found in .........., where the coelomic cavity is filled with blood.

Arthropods

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Mammals

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Aves

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Reptiles

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Solution

The correct option is B Arthropods
Mammals have a closed circulatory system with well-defined blood vessels. Their coelomic cavity shows various organs as gastrointestinal system, urinary system, etc.
Aves have a closed circulatory system with blood flowing in blood vessels.
Reptiles possess a closed circulatory system. They are coelomate.
Arthropods have an open circulatory system and are coelomate. Therefore, the blood flows in the cavity. The cavity is called as hemocoel and blood flows in the cavity is called as hemolymph. Therefore, the correct answer is option A.

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Question 47
Give examples for the following
(a) Bilateral, dorsiventral symmetry is found in___.
(b) Worms causing disease elephantiasis is ___.
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(d) ___are known to have pseudocoelom.

Question 47
Give examples for the following
(a) Bilateral, dorsiventral symmetry is found in___.
(b) Worms causing disease elephantiasis is ___.
(c) Open circulatory system is found in ___ where coelomic cavity is filled with blood.
(d) ___are known to have pseudocoelom.

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