Echinodermata Phylum Quiz

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Questions and Answers

What does 'Phylum Echinodermata' mean?

Spiky skin

Hard shell

Spiny skin (correct)

Soft skin

What is 'Class Asteroidea'?

Sea star

What is the water-vascular system?

Network of water-filled canals

What is pentaradial symmetry?

Circular body plan divided into 5 equal parts Signup and view all the answers

What are tube feet?

Extensions of the water vascular system Signup and view all the answers

What is the ambulacral ridge?

Bony ridge running down the middle of the arm Signup and view all the answers

What is the mouth in echinoderms?

Oral opening Signup and view all the answers

What are sensory tentacles?

Located at the tip of each arm/ray Signup and view all the answers

What is a radial canal?

Structure that runs the length of the arm Signup and view all the answers

What is the madreporite plate?

Filter plate for water intake Signup and view all the answers

What is the pyloric stomach?

Where stomach transfers food to digestive glands Signup and view all the answers

What are pyloric caeca?

Outpockets of the intestine Signup and view all the answers

What are dermal ossicles?

Little bones within the skin Signup and view all the answers

Where is the intestine located?

Just before the anus Signup and view all the answers

What is an ambulacral groove?

Channel along the oral surface Signup and view all the answers

What is a gonad?

Glands related to reproduction Signup and view all the answers

What is an eyespot?

Group of cells detecting light changes Signup and view all the answers

What is a ring canal?

Circular canal near the mouth Signup and view all the answers

What is a lateral canal?

Moves water to the ring canal Signup and view all the answers

What is an ampulla?

Dilation of a tubular structure Signup and view all the answers

What is the cardiac stomach?

Can digest food outside the starfish Signup and view all the answers

How do the digestive glands attach to the stomach?

Through the pyloric duct Signup and view all the answers

What are spines?

Rigid and sharp projections Signup and view all the answers

What is the anus?

Muscular opening for waste elimination Signup and view all the answers

What are ambulacral ossicles?

Bony structures beside tube feet Signup and view all the answers

What are dermal branchiae?

Flaps that diffuse ammonia Signup and view all the answers

How does locomotion occur in the sea star?

Through the water-vascular system Signup and view all the answers

How does feeding occur in the sea star?

1.) Swallows prey whole, 2.) Digests prey outside with cardiac stomach Signup and view all the answers

Are sea stars monoecious or dioecious?

Dioecious Signup and view all the answers

Is fertilization internal or external in sea stars?

External Signup and view all the answers

Study Notes

Phylum Echinodermata

Known as "spiny skin" due to the presence of dermal ossicles.
Members include various marine organisms like sea stars, sea urchins, and sea cucumbers.

Class Asteroidea

Commonly referred to as sea stars.
Exhibit a star-like shape with arms extending from a central disc.

Water-Vascular System

A network of water-filled canals enabling movement, food capture, waste expulsion, and gas exchange.
Critical for locomotion and feeding through tube feet.

Symmetry

Echinoderms display pentaradial symmetry, allowing their bodies to be divided into five equal parts.
This symmetry is prominent in their arm arrangement.

Tube Feet

Extensions of the water-vascular system, crucial for movement and feeding.
Function through hydraulic pressure provided by the water-vascular system.

Oral Features

The mouth serves as the oral opening, located on the underside.
Sensory tentacles are positioned at the tip of each arm, aiding in environmental interactions.

Digestive Structures

The pyloric stomach connects to digestive glands in each arm, facilitating digestion.
The cardiac stomach can be everted to digest prey externally, allowing nutrient absorption.

Anatomical Features

Ambulacral groove is a channel along the oral surface where tube feet extend.
Dermal ossicles contribute to the spiny exterior, while dermal branchia facilitate gas exchange.

Reproductive System

Gonads are responsible for sexual characteristics and reproductive processes.
Sea stars are dioecious with separate sexes, and fertilization occurs externally.

Sensory and Nervous System

Eyespots at the ends of arms detect light changes, aiding navigation and behavior.
Lateral canal directs water flow to the ring canal, part of the water-vascular system.

Locomotion and Feeding

Movement is primarily achieved through the water-vascular system.
Feeding involves swallowing prey whole or utilizing the cardiac stomach for external digestion.

Excretion

Anus acts as the muscular opening for waste elimination, linked to the intestine preceding it.
Ammonia diffuses out through dermal branchia, maintaining osmoregulation.

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Description

Test your knowledge on Echinodermata, the fascinating phylum known for its spiny skin and unique marine organisms. This quiz covers key features of members like sea stars, the water-vascular system, asymmetry, and more. Dive into the world of these remarkable creatures and discover interesting facts about their biology!