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Echinodermata Diversity Quiz

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Questions and Answers

What is a special characteristic shared by all members of the phylum Echinodermata?

Lack of internal skeleton

Pentamerous symmetrical body (correct)

Exclusively freshwater habitat

Simple digestive system

What is the complex of tubes found in echinoderms called?

Excretory ducts

Respiratory network

Digestive canals

Water vascular system (correct)

When did echinoderms first appear in the geological record?

Cambrian, 600 million years ago (correct)

Jurassic, 150 million years ago

Cretaceous, 100 million years ago

Permian, 250 million years ago

How many widely diverse classes of echinoderms survive today?

Six Signup and view all the answers

What is the meaning of pentamerous symmetry?

It means the body can be divided into two equal halves along five axes/radii Signup and view all the answers

What is the main component of the internal skeleton of echinoderms?

Calcium carbonate with little magnesium carbonate Signup and view all the answers

What is the meaning of the name 'Echinodermata'?

It means spiny skin Signup and view all the answers

What does the term 'test' refer to in the context of echinoderms?

A rigid box-like structure formed by fused calcareous ossicles Signup and view all the answers

What is the reason for the secondary development of pentamerous symmetry in echinoderms?

Due to their adaptation to a sessile way of life Signup and view all the answers

What is the composition of the calcareous skeleton in echinoderms?

Composed of calcium carbonate with little magnesium carbonate Signup and view all the answers