Questions and Answers
What does 'Phylum Echinodermata' mean?
What is 'Class Asteroidea'?
Sea star
What is the water-vascular system?
Network of water-filled canals
What is pentaradial symmetry?
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What are tube feet?
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What is the ambulacral ridge?
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What is the mouth in echinoderms?
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What are sensory tentacles?
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What is a radial canal?
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What is the madreporite plate?
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What is the pyloric stomach?
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What are pyloric caeca?
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What are dermal ossicles?
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Where is the intestine located?
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What is an ambulacral groove?
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What is a gonad?
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What is an eyespot?
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What is a ring canal?
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What is a lateral canal?
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What is an ampulla?
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What is the cardiac stomach?
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How do the digestive glands attach to the stomach?
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What are spines?
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What is the anus?
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What are ambulacral ossicles?
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What are dermal branchiae?
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How does locomotion occur in the sea star?
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How does feeding occur in the sea star?
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Are sea stars monoecious or dioecious?
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Is fertilization internal or external in sea stars?
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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!