Fossil Starfish 2: Echinoderm Characteristics Quiz

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What is the characteristic symmetry of most adult echinoderms?

Radial symmetry (correct)

Pentaradial symmetry

Spiral symmetry

Bilateral symmetry

What is the location of the mouth in echinoderms?

At the center of the disc (correct)

On the underside of the body

At the base of the arm

At the tip of the arm

What is the composition of the endoskeleton of echinoderms?

Calcareous plates (correct)

Fleshy tissue

Chitinous plates

Cartilaginous tissue

Which echinoderm group has secondarily evolved bilateral symmetry?

Sea cucumbers Signup and view all the answers

What is the function of the water vascular system in echinoderms?

Hydraulic pressure Signup and view all the answers

What is the structure that connects the water vascular system to the outside environment in echinoderms?

Madreporite Signup and view all the answers

What is a characteristic feature of the Asteroidea clade?

Tube feet on the ventral surface of their arms Signup and view all the answers

What is a unique reproductive feature of some starfish species?

They reproduce asexually by fission of their central disc Signup and view all the answers

How do starfish feed on their prey?

By using their tube feet to pry open mollusc shells Signup and view all the answers

What is a unique feature of the regeneration process in starfish?

They can regenerate an entire new limb over several months or years Signup and view all the answers

What is the name of the clade that includes sea lilies and feather stars?

Crinoidea Signup and view all the answers

How many clades are extant echinoderms divided into?

5 Signup and view all the answers

What is the primary mode of locomotion in sea urchins?

Using their spines (jointed ossicles) Signup and view all the answers

What is the feeding behavior of sea urchins?

Herbivorous, using jaw-like plates to grasp and grind algae Signup and view all the answers

What is the characteristic of sea cucumbers in terms of symmetry?

Secondarily bilaterally symmetrical Signup and view all the answers

What is the primary function of the tube feet in sea cucumbers?

For locomotion Signup and view all the answers

What is the characteristic of the endoskeleton in sea cucumbers?

Reduced to scattered ossicles Signup and view all the answers

What is the consequence of overharvesting of sea urchin predators?

Decimation of kelp forests Signup and view all the answers

What is the primary effect of overharvesting sea urchin predators on kelp forests?

Kelp forests are largely decimated Signup and view all the answers

What is the primary function of the jaw-like plates around the mouth of sea urchins?

To grasp and grind algae Signup and view all the answers

What is the characteristic of the endoskeleton in sea cucumbers?

It is made up of scattered ossicles Signup and view all the answers

What is the primary mode of feeding in holothuroidea?

Deposit or filter feeding Signup and view all the answers

What is the result of sea urchin population explosions on kelp forests?

Kelp forests are largely destroyed Signup and view all the answers

What is the characteristic of the tube feet in some species of sea cucumbers?

They are used for feeding Signup and view all the answers

What is a key factor influencing the starfish's ability to regenerate lost arms?

The developmental regulation of a single Hox gene cluster Signup and view all the answers

What is the primary mechanism by which starfish impact intertidal community structure?

Predation on molluscs and other invertebrates Signup and view all the answers

What is a characteristic feature of sea cucumbers that distinguishes them from other echinoderm groups?

The ability to evert their stomach onto prey Signup and view all the answers

What is the primary function of the tube feet in starfish?

To grip the substrate with suction and adhesive chemicals Signup and view all the answers

What is a unique reproductive feature of some starfish species?

Reproduction by fission of their central disc Signup and view all the answers

What is the primary food source for many starfish species?

Molluscs and other invertebrates Signup and view all the answers

What is a possible consequence of the regeneration process in starfish?

Disruption of nutrient cycling Signup and view all the answers

What is a characteristic of the dermis of echinoderms?

It is embedded with calcareous plates and spines Signup and view all the answers

Fossil Starfish 2: Echinoderm Characteristics Quiz

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Questions and Answers

What is the characteristic symmetry of most adult echinoderms?

What is the location of the mouth in echinoderms?

What is the composition of the endoskeleton of echinoderms?

Which echinoderm group has secondarily evolved bilateral symmetry?

What is the function of the water vascular system in echinoderms?

What is the structure that connects the water vascular system to the outside environment in echinoderms?

What is a characteristic feature of the Asteroidea clade?

What is a unique reproductive feature of some starfish species?

How do starfish feed on their prey?

What is a unique feature of the regeneration process in starfish?

What is the name of the clade that includes sea lilies and feather stars?

How many clades are extant echinoderms divided into?

What is the primary mode of locomotion in sea urchins?

What is the feeding behavior of sea urchins?

What is the characteristic of sea cucumbers in terms of symmetry?

What is the primary function of the tube feet in sea cucumbers?

What is the characteristic of the endoskeleton in sea cucumbers?

What is the consequence of overharvesting of sea urchin predators?

What is the primary effect of overharvesting sea urchin predators on kelp forests?

What is the primary function of the jaw-like plates around the mouth of sea urchins?

What is the characteristic of the endoskeleton in sea cucumbers?

What is the primary mode of feeding in holothuroidea?

What is the result of sea urchin population explosions on kelp forests?

What is the characteristic of the tube feet in some species of sea cucumbers?

What is a key factor influencing the starfish's ability to regenerate lost arms?

What is the primary mechanism by which starfish impact intertidal community structure?

What is a characteristic feature of sea cucumbers that distinguishes them from other echinoderm groups?

What is the primary function of the tube feet in starfish?

What is a unique reproductive feature of some starfish species?

What is the primary food source for many starfish species?

What is a possible consequence of the regeneration process in starfish?

What is a characteristic of the dermis of echinoderms?

What is the primary function of the hydraulic canals in the water vascular system of echinoderms?

What is a characteristic of sea cucumber ossicles?

What is a possible impact of starfish on intertidal communities?

What is a characteristic of starfish feeding behavior?

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