Which phylum has water vascular system as a characteristic feature?a)Phylum Ctenophorab)Phylum Coelenteratac)Phylum Echinodermatad)Phylum PoriferaCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Water vascular system I.e. Ambulacral system is present in Echinodermata....

Answer

Presence of water vascular system is the characteristic feature of Phylum echinodermata .

But not get confused with water canal system which is distinctive feature preasent in Phylum porifera

Which help in it in Nutrition,excretion ,reproduction even

But for water vascular it will not help in reproduction.

I think it will help.

Answer

Because helps in locomotion

Answer

The correct answer is option 'C' - Phylum Echinodermata.

Water Vascular System:
The water vascular system is a characteristic feature of the phylum Echinodermata. It is a unique hydraulic system that plays a vital role in locomotion, respiration, and feeding in echinoderms.

Components of the Water Vascular System:
The water vascular system consists of several interconnected fluid-filled canals and structures called tube feet. The main components of this system include:

1. Madreporite:
The madreporite is a sieve-like structure located on the aboral surface of echinoderms. It serves as the entrance for seawater into the water vascular system.

2. Stone Canal:
From the madreporite, seawater enters the stone canal, which is a narrow tube that leads to the ring canal.

3. Ring Canal:
The ring canal is a circular canal that encircles the central disk of the echinoderm. It gives rise to radial canals.

4. Radial Canals:
The radial canals extend from the ring canal to the arms or rays of the echinoderm. They transport seawater and distribute it to the tube feet.

5. Tube Feet:
Tube feet are small, muscular, hollow projections located on the ventral side of echinoderms. They are connected to the radial canals and serve various functions such as locomotion, feeding, and respiration. These tube feet can be extended or retracted by the contraction or relaxation of muscles.

Functions of the Water Vascular System:
The water vascular system in echinoderms performs several important functions, including:

1. Locomotion:
The tube feet play a crucial role in the movement of echinoderms. By extending and gripping onto substrates, they help in crawling, walking, and attachment to surfaces.

2. Feeding:
Tube feet are also involved in capturing and manipulating food. Some echinoderms, like sea stars, use their tube feet to pry open shells of prey, while others, like sea urchins, use them to scrape algae from rocks.

3. Respiration:
The water vascular system aids in respiration by allowing the exchange of gases with the surrounding seawater. Oxygen is absorbed, and carbon dioxide is released through the thin walls of the tube feet.

4. Sensory Perception:
The tube feet in echinoderms also play a sensory role. They are equipped with sensory cells that can detect touch, chemicals, and changes in the surrounding environment.

In conclusion, the water vascular system is a unique and characteristic feature of the phylum Echinodermata. It consists of interconnected canals and tube feet that perform various functions like locomotion, feeding, respiration, and sensory perception in echinoderms.

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