Echinoderms

The Greek word "echinos" in Phylum Echinodermata means...

• Spiny

• Round

• Skin

• Tube

Echinoderms cannot effectively maintain the proper balance of water and electrolytes in their body fluids. Therefore, they...

• Lack the ability to osmoregulate

• Store salt in their tissues

• Drink seawater to balance ions

• Excrete excess salt through skin

As larvae, echinoderms are _______ symmetrical and show ________ symmetry as adults.

• Bilaterally; secondary radial

• Radially; bilateral

• Bilaterally; pentaradial

• Pentaradially; bilateral

Which of the following is a characteristic of Phylum Echinodermata?

• They have no well-defined head or brain

• They have jointed appendages

• They undergo molting

• They breathe through lungs

A system of canals and specialized tube feet that functions in locomotion, food gathering, respiration, and excretion in echinoderms is called the...

• Water vascular system

• Circulatory system

• Digestive canal

• Gastrovascular cavity

Echinoderms have an endoskeleton of __________, often with spines.

• Keratin plates

• Calcareous ossicles

• Chitin rings

• Collagen fibers

The water vascular system opens to the outside through small pores in the...

• Madreporite

• Spines

• Oral disc

• Pyloric caeca

Which class in Echinodermata includes sea stars and is commonly found on rocky shores and coral reefs?

• Class Asteroidea

• Class Echinoidea

• Class Holothuroidea

• Class Crinoidea

This class in Echinodermata has a body that is flattened, flexible, and covered with a ciliated, pigmented epidermis.

• Class Asteroidea

• Class Echinoidea

• Class Holothuroidea

• Class Crinoidea

Around the base of each spine in echinoderms, there are pincer-like structures that sometimes help with food capture. These are called...

• Pedicellariae

• Tube feet

• Ampullae

• Madreporites