1.

Which among the following is incorrect about Echinodermata?(a) The word “Echino” means spiny and “dermata” means skinned(b) Echinoderms are dioecious with fertilization being external in most cases(c) They have a central nerve ring that extends throughout their body(d) The circulatory system is closed and they have a heart along with blood vesselsI got this question in examination.My question comes from Classification of Animal Kingdom into Different Phylum-4 topic in division Animal Kingdom of Biology – Class 11

Answer»

The correct option is (d) The circulatory system is closed and they have a heart along with BLOOD vessels

To explain I would say: The word “Echino” MEANS spiny and “dermata” means skinned. Echinoderms are dioecious with fertilization being EXTERNAL in most cases. They have a central nerve ring that extends throughout their body. The circulatory system in Echinoderms is of open type.


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