Ch 2 - Observing Invertebrates (2.7 - 2.11)

Question 1

List four characteristics of crustaceans.

Answer 1

Any of the following:

jointed appendages
segmented bodies with three main body regions
external skeletons made of chitin
four antennae
many have pincers and ten jointed legs
most have compound eyes on eye stalks

Question 2

What term describes the process in which a crustacean sheds its exoskeleton to make room for its expanding body?

Answer 2

moulting

Question 3

Which crustaceans run sideways?

Answer 3

crabs

Question 4

Name the hard, protective shell that shields a crab’s soft body.

Answer 4

carapace

Question 5

Which lobster does not have pincers?

Answer 5

Spiny lobster

Question 6

What are the smallest shrimp mentioned in the text?

Answer 6

brine shrimp

Question 7

What are the largest shrimp mentioned in the text?

Answer 7

prawns

Question 8

What crustacean lives in damp areas on land?

Answer 8

wood louse or pillbug (roly-poly)

(we call them slaters)

Question 9

What fast, flat-bodied, carnivorous arthropod has one pair of legs per body segment, and what does its name mean?

Answer 9

the centipede; one-hundred footed

Question 10

What slow, round-bodied, herbivorous arthropod has two pairs of legs per body segment, and what does its name mean?

Answer 10

millipede; one-thousand footed

Question 11

What invertebrates swallow soil and are beneficial to farmers?

Answer 11

earthworms

Question 12

Name three parasitic worms.

Answer 12

leeches
tapeworms
roundworms

Question 13

Identify the order of invertebrates whose name means “stomach-foot” and give two examples.

Answer 13

gastropods

eg: snail, slug, cowrie, conch, nudibranch

Question 14

What is the name for a one-shelled mollusk, and give two examples.

Answer 14

univalve

eg: cowrie, conch, snail

Question 15

What is the name for a two-shelled mollusk? Give two examples.

Answer 15

bivalve

eg: mussel, oyster, clam, scallop

Question 16

Which order of invertebrates has a name that means “head-foot”? Give two examples.

Answer 16

cephalopods

eg: octopus, squid, cuttlefish, nautilus

Question 17

What are the main differences between an octopus and a squid?

Answer 17

An octopus has eight tentacles and no shell.

A squid has ten tentacles and an internal shell.

Question 18

What is the tissue that forms the shell of a mollusk called?

Answer 18

the mantle

Question 19

Name the unusual invertebrate that feeds on mollusks by sticking its stomach into their shells.

Answer 19

the sea star

Question 20

What relative of the sea star is covered with spines?

Answer 20

the sea urchin

Question 21

Identify the flowerlike invertebrate found on the ocean floor, which uses its colourful tentacles to paralyze its prey.

Answer 21

sea anemone

Question 22

What tiny animals are responsible for building underwater ridges and reefs?

Answer 22

coral polyps

Question 23

What beautiful, bowl-shaped animal floats near the surface of the water trailing stinging tentacles?

Answer 23

jellyfish

Question 24

Name the tiny freshwater invertebrate with tentacles around its mouth.

Answer 24

hydra

Question 25

Which creature is like a floating colony of jellyfishlike animals?

Answer 25

Portuguese man-of-war

Question 26

What are the three main stages a jellyfish goes through in its life?

Answer 26

larva, polyp, and medusa

Question 27

What group of invertebrates are the smallest of all animals?

Answer 27

protozoans

Question 28

How do protozoans differ from larger invertebrates?

Answer 28

Each is made of one single cell.