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Video Clips and Animations
Chapter Review Questions
Standardized Test Practice
Sea Anemone-Radial Symmetry
Lobster – Bilateral Symmetry
Sponge – Asymmetrical Symmetry
Sea Anemone Tentacles
Lifecycle of a Tapeworm
Earthworm’s Organ System
Sea Star Eating
Make the following Foldable to compare and contrast the characteristics of water and land invertebrates.
Fold one sheet of paper lengthwise.
Fold into thirds.
Unfold and draw overlapping ovals. Cut the top sheet along the folds.
Label the ovals as shown.
Construct a Venn Diagram
As you read this chapter, list the characteristics unique to water invertebrates under the left tab, those unique to land invertebrates under the right tab, and those characteristics common to both under the middle tab.
Click box to view movie.
What is an Animal?
Sponges, Cnidarians, Flatworms, and Roundworms
Mollusks and Segmented Worms
Arthropods and Echinoderms
According to this diagram, the animal kingdom is divided into _______.
C. animals with bilateral symmetry and those
with radial symmetry
D. animals with cells and those without cells
The correct answer is B. This chart shows how animals can be divided into invertebrates, those without a backbone, and vertebrates, those with a backbone. About 97 percent of all animals are invertebrates.
Describe the asexual stage in the life cycle of this cnidarian.
During the asexual stage the polyp, which developed from the larva, grows. The polyp then begins to form buds that become tiny medusae. After the medusae are released, they grow and begin the sexual cycle.
Why are sponges called filter feeders?
Sponges filter food out of the water that flows through their bodies. Their specialized collar cells have flagella that keep water moving through the sponge.
Which is a characteristic of gastropods?
A. secrete mucus
B. sucking disk on two ends
C. two shell halves
D. well developed head
The correct answer is A. The mucus secreted by gastropods allows them to glide across objects on their large muscular foot.
Sheree told a friend that she is not afraid of any arthropods but that she would rather pick up a millipede than a centipede. From what you know about these two arthropods, why do you think she may have said this?
Centipedes are predators that use venom to capture their prey while millipedes eat plants. Sheree probably did not want to risk getting a bite from a centipede.
Which is a characteristic of all animals?
A. bilateral symmetry
B. digest their food
C. have a backbone
D. reproduce asexually
The correct answer is B. All animals use digestion to break large food particles down into smaller substances that their cells can use. The other characteristics listed describe only some animals.
What does this diagram show about the life cycle of the tapeworm?
A. Humans become
infected by eating
B. If humans eat
attach to their
C. Tapeworm larvae
D. Tapeworms live
in the grass
where cows will
The correct answer is C. If cows eat grass contaminated with fertilized tapeworm eggs, they become infected with tapeworms. After the eggs hatch, the larvae burrow into the cow’s muscle. Humans can get infected by eating improperly cooked meat.
Which is a part of the digestive system where food and soil is ground?
D. waste removal tubes
The correct answer is B. After food and soil are ground in this muscular structure, it is passed to the intestine. Undigested soil and wastes leave the worm through the anus.
Which is a characteristic of spiders that distinguishes them from other arthropods?
A. They are predators.
B. They have five pair of legs.
C. They have spiny skin.
D. They weave webs.
The correct answer is D. Some spiders weave webs to capture their prey. Spiders are members of the arachnids. Arthropods in this group have two body regions and have four pairs of legs.
What would this sea star use its tube feet for?
A. absorb prey
B. capture prey
C. digest prey
The correct answer is B. The tube feet are part of the water vascular system of the sea star and work like suction cups. They help the sea star move and capture prey.
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