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Part IV: Mollusks, Worms, Arthropods, Echinoderms
Final exam study guide questions -- 7th gr.
11
Science
7th Grade
05/20/2011

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Cards

Term
What is the body plan for a mollusk?
Definition
[image]
Term
List types of mollusks.
Definition
gastropods, bivalves, and cephalopods
Term
Know the parts of an earthworm.  (Not shown: nerve, setae, aortic arches, and brain -- see pg. 370)
Definition
[image]
Term
How does an earthworm exchange O2 and CO2 with its environment?
Definition
through its skin
Term
How does an earthworm digest food?
Definition
through its crop and gizzard
Term
How do we classify arthropods?
Definition
as insects
Term
Compare and contrast insects with arachnids.
Definition

1. Insects have three body parts: head, thorax, and abdomen. Arachnids have two: cephalotorax and abdomen.

2.  Insects have antennae and arachnids do not.

3.  Insects have 3 pairs of legs.  Arachnids have 4 pair of legs and no wings.

Term
What is the difference between complete and incomplete metamorphosis?
Definition

1.  incomplete:  egg, nymph, and adult

2.  complete:  egg, larva, pupa, and adult

Term
What are some examples of gastropods?
Definition
snails and slugs
Term
What are some examples of bivalves?
Definition
clams, oysters, and scallop
Term
What are some examples of cephalopods?
Definition
octopus and squid
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