16 Questions
What is the function of tube feet in echinoderms?
Used for movement, feeding, and respiration
Which class of echinoderms is characterized by a globular body and movable spines?
Echinoidea
What is the process by which echinoderm larvae settle on the ocean floor and undergo transformation?
Metamorphosis
What is a distinctive feature of the echinoderm skeleton?
Made of calcite
How do echinoderm adults reproduce?
Sexually, releasing gametes into the water column
Which echinoderm class is known for its feathery arms and stalked body?
Crinoidea
What is the main characteristic of an echinoderm's body structure?
A central body with arms or rays that radiate from it
What is the primary function of an echinoderm's water vascular system?
To help with movement and feeding
Which of the following is NOT a type of echinoderm?
Sea slugs
What is the primary source of food for echinoderms?
Algae and invertebrates
What is the role of echinoderms in marine ecosystems?
They play a crucial role in maintaining ecosystem balance
How do echinoderms move?
Using their water vascular system to move and manipulate objects
What is the typical body shape of echinoderms?
Radial symmetry
What is the function of the anus in echinoderms?
To eliminate waste
Which of the following classes of echinoderms includes sea stars and starfish?
Asteroidea
What is the process by which echinoderm larvae develop?
Metamorphosis
Study Notes
Characteristics
- Echinoderms are a phylum of marine animals
- Characterized by:
- Radial symmetry (body organized around a central axis)
- Calcite skeleton
- Water vascular system (unique system of fluid-filled vessels)
- Tube feet (used for movement, feeding, and respiration)
Body Structure
- Body shape varies among classes, but typically includes:
- Central body (disc or sphere)
- Arms or rays ( extensions of the body)
- Mouth and anus on opposite sides of the body
- Skin and muscles are thin, allowing for flexibility
Classes of Echinoderms
-
Asteroidea (Starfish or Sea Stars)
- Characterized by five-armed body shape
- Feed on clams, mussels, and snails
-
Ophiuroidea (Brittle Stars)
- Characterized by long, slender arms
- Feed on small invertebrates and organic matter
-
Echinoidea (Sea Urchins)
- Characterized by globular body and movable spines
- Feed on algae and small invertebrates
-
Holothuroidea (Sea Cucumbers)
- Characterized by elongated, soft body
- Feed on organic matter and small invertebrates
-
Crinoidea (Sea Lilies)
- Characterized by feathery arms and stalked body
- Feed on small invertebrates and organic matter
Development and Reproduction
- Echinoderms undergo indirect development (larval stage)
- Larvae settle on the ocean floor and undergo metamorphosis
- Adults reproduce sexually, releasing gametes into the water column
- Fertilization occurs externally, and larvae develop from zygotes
This quiz covers the characteristics, body structure, and development of echinoderms, a phylum of marine animals. Learn about the different classes of echinoderms, including starfish, brittle stars, sea urchins, sea cucumbers, and sea lilies. Understand their unique features, feeding habits, and life cycles.
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