Question

Water vascular system is found in
A. Hydra
B. Leech
C. Fish
D. Starfish

Answer 1

Hint: Water vascular system is a system in certain living organisms which helps in locomotion, food and waste transportation and in respiration. It is also known as a hydraulic system.

Complete Answer:
Water vascular system is a hydraulic system which is composed of canals connecting numerous tube feet. Organisms containing this system move by alternatively contracting their muscles that will force the water into tube feet which will allow them to extend their body and push them against the ground, thus creating a motion. This is followed by relaxing which allows them to retract.

Let us analyze the options to find out the correct answer.
Option A: Hydra belongs to the genus of freshwater organisms with class hydrozoa. They are found in temperate and tropical regions. They have the ability to regenerate. They do not have any vascular system.Therefore, this is the incorrect option.

Option B: Leech are segmented parasites that belong to the phylum Annelida. They are closely related to earthworms and have soft muscular bodies. They do not possess any vascular system for their locomotion and transportation. They have their own physical features to do these tasks.Therefore, this is the incorrect option.

Option C: Fish are gill bearing aquatic organisms which lack limbs and digits. For respiration they have the presence of gills and remove their waste through osmosis. They do not have the presence of a water vascular system.Therefore, this is the incorrect option.

Option D: Star fish is also called sea stars and they belong to the class of echinoderms. Echinoderms consist of a water vascular system that help them in performing functions like locomotion, transportation of food and waste materials and even in the process of respiration. They belong to the class of Asteroidea.Therefore, this is the correct option.

Thus, the correct option is D) Star fish.

Note: Sea stars are star shaped echinoderms. They have a sieve like structure on the upper surface of their body through which the water enters the body. This structure is called madreporite.