Question

Which among the following is incorrect about Echinoderms?

(a) Larval stage is bilaterally symmetrical and adults are radially symmetrical

(b) They are dioecious and most of the times the fertilization is external

(c) The larvae is immobile and bilaterally symmetrical

(d) They have a complete digestive system with mouth on the ventral side and anus on the dorsal side

I got this question during an interview.

This key question is from Classification of Animal Kingdom into Different Phylum-4 topic in portion Animal Kingdom of Biology – Class 11

Answer 1

Right option is (c) The larvae is immobile and bilaterally symmetrical

Best explanation: Larval stage is bilaterally symmetrical and adults are radially symmetrical. They are dioecious and most of the times the fertilization is external. The larvae is immobile and bilaterally symmetrical. They have a complete digestive system with mouth on the ventral side and anus on the dorsal side.