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Ch 28 - Arthropods and Echinoderms



Modified True/False (Value 10)
Indicate whether the statement is true or false.  If false, change the identified word or phrase to make the statement true.
 

 1. 

An adult starfish has radial symmetry. _________________________

 

 2. 

If an arthropod has antennae and its body is divided into a cephalothorax and an abdomen, the arthropod is classified in the group called chelicerates. _________________________

 

 3. 

One of the common features of arthropods is a tough endoskeleton. _________________________

 

 4. 

The process in which an arthropod sheds its skeleton and manufactures a larger one is called flexing. _________________________

 

 5. 

In a crayfish, the carapace is the part of the skeleton that covers the abdomen. _________________________

 

 6. 

If an insect exists as a nymph before becoming an adult, the insect goes through complete metamorphosis. _________________________

 

 7. 

The mouthparts of insects consist of three pairs of appendages, including a pair of chelicerae. _________________________

 

 8. 

When an echinoderm exerts a pulling force on an object, muscles pull the centers of the tube feet upward. _________________________

 

 9. 

An echinoderm’s water vascular system opens to the outside through the ring canal. _________________________

 

 10. 

When a honeybee performs the round dance, it indicates that a food source has a low energy value by changing direction less frequently than it would if the food were high quality. _________________________

 

Completion (Value 10)
Complete each statement.
 

 11. 

In the water vascular system of a sea star, the _________________________ connect the ring canal with the tube feet.
 

 

 12. 

Insects have ____________________ pairs of legs.
 

 

 13. 

In arthropods, the main nerve cord runs along the _________________________ surface of the body.
 

 

 14. 

An immature grasshopper resembles an adult grasshopper but does not have wings. Therefore, grasshoppers undergo ____________________ metamorphosis.
 

 
 
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Figure 28–2
 

 15. 

On the chelicerate in Figure 28–2, the appendages labeled 2, which contain fangs, are called ____________________.
 

 

 16. 

Within an insect society, particular tasks or roles are performed by groups of individuals called ____________________.
 

 

 17. 

Each segment in the body of a trilobite had two ____________________ attached to it.
 

 

 18. 

A typical primitive arthropod had many identical ____________________, each with a pair of appendages.
 

 

 19. 

In an echinoderm, oxygen is carried throughout the body by the _________________________ system.
 

 

 20. 

A uniramian with wings must be a(an) ____________________.
 

 

Short Answer (Complete 2 of the below 5 questions) Value 4
 

 21. 

What will happen if a sea star is pulled into pieces?
 

 22. 

Suppose an insect lacked the skin glands that digest the inner part of the exoskeleton. What effect would this condition have on the insect?
 

 23. 

How are mites and ticks harmful to humans?
 

 24. 

If you found a caterpillar of a species you had never seen before, why would it be difficult to predict what the adult of that species looks like?
 

 25. 

How does a worker ant communicate the location of a food source to other ants in the colony?
 

Multiple Choice (Value 20) out of 21 questions
Identify the choice that best completes the statement or answers the question.
 

 26. 

The plates of the endoskeleton are reduced and contained inside a soft, muscular body wall in
a.
brittle stars.
c.
sand dollars.
b.
sea urchins.
d.
sea cucumbers.
 

 27. 

Insects are classified as
a.
uniramians.
c.
crustaceans.
b.
arachnids.
d.
chelicerates.
 

 28. 

Which of the following is true of arthropods?
a.
They live only on land.
b.
They are all plant eaters.
c.
Fossil arthropods appear recently compared to other animal groups.
d.
There are more species of arthropods than any other group of animals.
 

 29. 

What substance found in the skeleton of a desert-dwelling beetle is likely to be absent from the skeleton of an aquatic beetle?
a.
protein
c.
wax
b.
silk
d.
chitin
 

 30. 

The evolution of arthropods has led to
a.
fewer body segments and fewer specialized appendages.
b.
more body segments and fewer specialized appendages.
c.
fewer body segments and more specialized appendages.
d.
more body segments and more specialized appendages.
 

 31. 

What does molting enable arthropods to do?
a.
to grow
c.
to eat
b.
to reproduce
d.
to breathe
 

 32. 

The respiratory organ in terrestrial chelicerates is the
a.
book lung.
c.
book gill.
b.
pedipalp.
d.
chelicera.
 

 33. 

In an echinoderm, the structure that operates like a living suction cup is the
a.
nerve ring.
c.
stomach.
b.
madreporite.
d.
tube foot.
 

 34. 

An example of a chelicerate is a
a.
crayfish.
c.
spider.
b.
lobster.
d.
centipede.
 

 35. 

Which appendages are especially important in the classification of arthropods?
a.
swimmerets
c.
antennae
b.
mouthparts
d.
legs
 

 36. 

An arthropod is vulnerable to predators during the molting period because
a.
predators are more numerous during this period.
b.
its new exoskeleton is soft.
c.
molting cannot occur without the assistance of predators.
d.
it must come out of hiding to molt.
 

 37. 

The echinoderms that look like warty, moving pickles are
a.
sea stars.
c.
sea cucumbers.
b.
feather stars.
d.
sea urchins.
 

 38. 

Typical primitive arthropods had bodies that were composed of
a.
no segments.
c.
three segments.
b.
many segments.
d.
one segment.
 

 39. 

In echinoderms, body parts usually occur in multiples of
a.
seven.
c.
three.
b.
two.
d.
five.
 

 40. 

Sea lilies and feather stars
a.
are disk-shaped echinoderms that often burrow into the sand.
b.
feed by scraping algae from rocks.
c.
make up the oldest class of echinoderms.
d.
are the only echinoderms that live in fresh water.
 

 41. 

The compound eyes of insects
a.
produce an image that is more detailed than what humans see.
b.
are located on the thorax.
c.
are not very good at detecting movement.
d.
are made of many lenses.
 

 42. 

Which of these events is the first to happen when an arthropod molts?
a.
The animal fills with air or fluids.
b.
The animal pulls itself out of the original skeleton.
c.
Skin glands digest the inner part of the skeleton.
d.
A new skeleton is secreted.
 

 43. 

To determine whether an animal is a cnidarian or an echinoderm, you should
a.
determine its habitat.
b.
find out if it has a backbone.
c.
study its embryonic development.
d.
discover whether it is aquatic or terrestrial.
 

 44. 

Which of the following is NOT a stage of complete metamorphosis?
a.
nymph
c.
larva
b.
pupa
d.
egg
 

 45. 

Echinoderms are like vertebrates in that echinoderms
a.
are deuterostomes.
b.
have an anterior end and a posterior end.
c.
have cephalization.
d.
are bilaterally symmetrical as larvae and as adults.
 

 46. 

An insect can detect minute movements in its environment by using its compound eyes and its
a.
Malpighian tubules.
c.
sensory hairs.
b.
chelicerae.
d.
tracheal tubes.
 



 
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