Chapter 12

Question 1

A state in which metabolism is extremely low, and in which the water content of the body is reduced to a few percent, is called ______

Answer 1

Cryptobiosis

Question 2

Minute, mostly terrestrial animals living in the water film that surrounds mosses and lichens belong to the phylum _______

Answer 2

Tardigrada

Question 3

True/False

Most nematode worms are under 5 cm long, but some are over a meter in length

Answer 3

True

Question 4

Nematodes have a fluid-filled pseudocoel that serves as a ______ skeleton

Answer 4

Hydrostatic

Question 5

Elephantiasis is caused by filarial worms that live in the

Answer 5

Lymphatic system

Question 6

Adult Ascaris worms are found in the host’s

Answer 6

Small intestines

Question 7

Onychophorans

Answer 7

Share some characteristics with annelids and some with arthropods

Question 8

True/False

The nematodes are the most diverse of the pseudocoelomates and include many important human parasites

Answer 8

True

Question 9

Nematodes

Answer 9

Are dioecious

Question 10

True/False

Terrestrial tardigrades cannot withstand harsh environmental conditions

Answer 10

False

Question 11

Tardigrades

Answer 11

Have a cuticle

Question 12

Juvenile trichina worms live in the

Answer 12

Skeletal muscle

Question 13

One of the most studied nematodes, whose genome is now known by geneticists is

Answer 13

Caenorhabditis elegans

Question 14

The Onychophora and Tardigrades share some arthropod-like characteristics

Answer 14

True

Question 15

Nematodes have circular muscles, but no longitudinal muscles in their body wall

Answer 15

True