WorksheetsCJHS 7 Science Ch. 13
Total questions: 25
Worksheet time: 13mins
Name
Class
Date
1.
Insecticides do not pollute the environment.
a)
True
b)
False
2.
Both mollusks and segmented worms have an open circulatory system.
a)
True
b)
False
3.
Insect pests destroy more than food crops.
a)
True
b)
False
4.
All mollusks have shells.
a)
True
b)
False
5.
Cephalopods are the largest group of mollusks.
a)
True
b)
False
6.
Echinoderms are invertebrates that live in the ocean.
a)
True
b)
False
7.
Leeches can live only by sucking blood.
a)
True
b)
False
8.
Leeches secrete a substance that prevents blood from clotting.
a)
True
b)
False
9.
__________ that have two shells, include clams and scallops.
a)
Gastropods
b)
Bivalves
c)
Cephalopods
10.
What kind of arthropod has exactly eight legs?
a)
arachnid
b)
centipede
c)
crustacean
11.
Which of the following is NOT an echinoderm?
a)
sea star
b)
sand dollar
c)
lobster
12.
When an arthopod molts, it sheds its _____________.
a)
radula
b)
exoskeleton
c)
mantle
13.
Earthworms grind soil in the __________.
a)
crop
b)
setae
c)
gizzard
14.
In complete metamorphosis, the organism goes through how many stages in body form?
a)
two
b)
three
c)
four
15.
To get food, earthworms eat __________
a)
arthropods
b)
fungus
c)
soil
16.
Organs that exchange oxygen and CO2 in water are called...
a)
gills
b)
spiracles
c)
appendages
17.
Legs, antennae, claws and pinchers...
a)
appendages
b)
gills
c)
setae
18.
muscular structure that grinds soil
a)
gizzard
b)
crop
c)
mullusks
19.
sac earthworms use for storage
a)
crop
b)
mantle
c)
pupa
20.
a gastropods organ with rows of teeth for scraping
a)
setae
b)
radula
c)
egg
21.
a series of changes in body form
a)
metamorphosis
b)
appendages
c)
spiracles
22.
when a exoskeleton is shed and replaced
a)
molting
b)
bivalve
c)
leeching
23.
name that means "jointed foot"
a)
annelids
b)
arthropod
c)
molting
24.
bristle-like structures that help worms move
a)
fungus
b)
setae
c)
cilia
25.
external covering that supports and protects bodies
a)
mantle
b)
annelid
c)
skeleton
100 %
