Unit 6: Assignment 1: Objective 1

Unit 6: Assignment 1: Objective 1

Use chapter 22 and the notes to answer the following questions.

Question 1 1 pts

pincerlike appendages on some of the spines found on sea stars and sea urchins.

Pedicellariae

Ampulla

Madreporite

Rays

Question 2 1 pts

long tapering arms of a starfish

Madreporite

Ampulla

Rays

Tube feet

Question 3 1 pts

is a hydraulic system that operates under water pressure. Water enters and leaves the water vascular system of a sea star through the madreporite (mahdruh POHR ite).

Tube feet

Pedicellariae

Water vascular system

Ampulla

Question 4 1 pts

a sievelike, disk-shaped opening on the upper surface of the echinoderm’s body.

Pedicellariae

Endoskeleton

Ampulla

Madreporite

Question 5 1 pts

are hollow, thin-walled tubes that end in a suction cup.

Endoskeleton

Pedicellariae

Tube feet

Ampulla

Question 6 1 pts

The round, muscular structure on tube feet which works something like the bulb of a dropper.

Ampulla

Madreporite

Pedicellariae

Endoskeleton

Question 7 1 pts

Type of skeletal system when muscles attach to an internal structure to provide movement and support.

Ectoskeleton

Endoskeleton

Question 8 1 pts

The endoskeleton of all echinoderms is made primarily of calcium carbonate, the compound that makes up limestone.

True

False

Question 9 1 pts

An echinoderm uses its jawlikepedicellariae for protection and for cleaning the surface of its body.

True

False

Question 10 1 pts

Each tube foot works independently of the others, and the animal moves along slowly by alternately pushing out and pulling in its tube feet.

True

False

Question 11 1 pts

Tube feet also function in gas exchange and excretion. Gases are exchanged and wastes are eliminated by diffusion through the thin walls of the tube feet.

True

False

Question 12 1 pts

Echinoderms have a simple brain in their head.

True

False

Question 13 1 pts

Echinoderms have cells that detect light and touch, but most do not have sensory organs.

True

False

Question 14 1 pts

Echinoderms have a simple nervous system in which nerves extend from the nerve ring down each ray. Each radial nerve then branches into a nerve net that provides sensory information to the animal.

True

False

Question 15 1 pts

A sensory organ known as an eyespot and consisting of a cluster of light-detecting cells is located in the center of the starfish

True

False

Question 16 1 pts

If you examine the larval stages of echinoderms, you will find that they have radial symmetry like the adults.

True

False

Question 17 1 pts

Echinoderms go through metamorphosis, the free-swimming larvae make dramatic changes in both body parts and in symmetry.

True

False

Question 18 1 pts

Like most invertebrates, Echinoderms are protostomes.

True

False

Question 19 1 pts

This pattern of development for starfish indicates a close relationship to chordates, which are also deuterostomes.

True

False