Question

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 vessels

I 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 1

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.