Read the following statements and choose the follwoing option: 1. Echinoderms have an incomplete digestive system 2. Asterias have a water vascular system 3. The adult echinoderms are radially symmetrical but larvae are bilaterally symmetrical. 4. They are triploblastic and coelomate animals. 5. Digestive system is complete with mouth on the lower (ventral) side and anus on the upper (dorsal) side

Step-by-step solution

These animals have an endoskeleton of calcareous ossicles and, hence, the name Echinodermata (Spiny bodied, Figure 4.14). All are marine with organ-system level of organisation. The adult echinoderms are radially symmetrical but larvae are bilaterally symmetrical. They are triploblastic and coelomate animals. Digestive system in echinoderms is complete with mouth on the lower (ventral) side and anus on the upper (dorsal) side.The most distinctive feature of echinoderms is the presence of water vascular system which