Question

Ambulacral system is mainly used for
A. Locomotion
B. Circulation
C. Feeding
D. Defense

Answer 1

Hint: There are many systems in various types of organisms for performing the basic functions necessary for their survival. Water vascular system is one such system found in echinoderms (sea urchins, sea stars).

Complete answer:
In order to solve this question we need to know about echinoderms.

Echinodermata: These are organisms which live in sea water thus are marine animals.
They are found on barrier reefs.
They have many systems
1. Digestive system
2. Nervous system
3. Circulatory system
4. Respiratory system
5. Reproductive system
6. Excretory system
7. Ambulacral system

Ambulacral system: It is also known as water vascular system or hydraulic system or aquiferous system.
- It is a complex system which contains pipe-like structures called canals.
- These canals are interconnecting links between various tube feet.
- It consists of a ring which is circumoral present in proximity to the esophagus which also shows canals that are radiating in nature.
- It is a special feature seen in echinoderms
- Ambulacral parts consist of plates, spines, suckers and ossicles.
- An ambulacral groove is also found.
- It extends from the mouth to the terminal part of the arm.
- It performs various functions such as movement, transportation of food and various other products and exchange of gases (respiration).
- It performs locomotion through muscle contraction.
- The various canals about which we have learnt above makes body movement easy in echinoderms.

So, the correct option is option A. locomotion.

Note: Echinodermata are named due to their special feature that is spiny skin.
These are invertebrates.
They exclusively live in sea water.
They have a unique body shape that can be spherical, star shaped, or tube like.
Examples: star fish, sea cucumber, sea urchin, etc