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Question
Primitive nervous system is found in
Primitive nervous system is found in
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Solution
The correct option is D Cnidaria
The nervous system is absent in Porifera. Porifera has cellular level of organisation and thus, they do not have any organ or organ system. Whereas in Coelenterates, nerve cells are present but not organised into a nervous system, this type of unorganised nervous system is called as a primitive nervous system. Echinoderms have a diffuse network of nerves and neurons. Annelids also have a nervous system made up of two ventral cords and a single large nervous cell acting as a brain.Thus, the correct answer is option B.
The nervous system is absent in Porifera. Porifera has cellular level of organisation and thus, they do not have any organ or organ system. Whereas in Coelenterates, nerve cells are present but not organised into a nervous system, this type of unorganised nervous system is called as a primitive nervous system. Echinoderms have a diffuse network of nerves and neurons. Annelids also have a nervous system made up of two ventral cords and a single large nervous cell acting as a brain.
Thus, the correct answer is option B.
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