NTA Abhyas NEET2020BotanyAnimal KingdomPractice
Which of the following sets of characteristics is found in phylum Echinodermata?
Options
- APresence of water vascular system and indirect development of larvae
- BBilaterally symmetrical and acoelomate
- CReproduction is asexual and fertilisation is internal
- DPresence of water vascular system with a well-developed excretory system
Correct answer
A. Presence of water vascular system and indirect development of larvae
Step-by-step solution
Adult echinoderms are radially symmetrical, while their larvae is bilaterally symmetrical. They are triploblastic and coelomate organisms. The most distinctive feature of echinoderms is the presence of water vascular system which helps in locomotion, capture and transport of food and respiration. An excretory system is absent. Sexes are separate. Reproduction is sexual. Fertilisation is usually external. Development is indirect with free-swimming larvae.