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Chapter 5 Vocabulary (BJU)
Animal Classification
44
Science
6th Grade
10/17/2010

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Term
invertebrates
Definition
animals without backbones
Term
vertebrates
Definition
animals with backbones
Term
Porifera
Definition
Phylum of animals that sponges belong to.  The animals in this group sit on the ocean floor and pump water through their bodies.  The water goes through tiny pores in the outside of the sponge extracting nutrients and small organisms that it needs.
Term
nematocysts
Definition
tiny organelles that deliver a powerful sting
Term
Cnidaria
Definition
phylum of animals like the jellyfish that use nematocysts to capture their food
Term
mollusks
Definition
animals that have soft bodies and mantles
Term
bivalve
Definition
mollusk has two shells
Term
univalve
Definition
animal has only one shell
Term
nudibranch
Definition
a type of slug that live in the ocean
Term
cephalopod
Definition
head-footed
Term
terrarium
Definition
a container of plants and sometimes animals that is made to imitate a specific environment
Term
radial symmetry
Definition
equal parts radiate from the center
Term
tube feet
Definition
located on the underside of an echinoderm; feet that have tiny little suckers on them to help the animal stick to different surfaces.
Term
filter feeders
Definition
a type of echinoderm that eats whatever comes floating through the water i.e. plankton & any other tiny life forms
Term
bilateral symmetry
Definition
something that can be divided down the middle and be the same on both sides
Term
parasites
Definition
an organism that lives and feeds on another organism.
Term
host
Definition
the living organism that a parasite lives on or in
Term
free-living
Definition
independent of other organisms
Term
annelid
Definition
segmented worm
Term
segments
Definition
similar pieces
Term
setae
Definition
hairlike structures that many segmented worms use to move
Term
arthropod
Definition
an animal that has jointed legs, a segmented body with an exoskeleton, and antennae.
Term
exoskeleton
Definition
a hard covering that acts like a knight's armor, protecting the arthropod's body.
Term
molt
Definition
shed an exoskeleton
Term
crustaceans
Definition
an animal that has jointed legs, had antennae, breathes through gills, and usually has some sort of claw.
Term
arachnids
Definition
an arthropod that has eight legs and two body segments
Term
spinnerets
Definition
silk-spinning organ in the back of the spider
Term
insects
Definition
an arthropod that has three segments (a head, thorax, and abdomen), three pairs of legs on the thorax and usually two pairs of wings.
Term
metamorphosis
Definition
the process of becoming an adult through distinctive stages.
Term
incomplete metamorphosis
Definition
the process undergone by many insects that includes egg, nymph, and adult
Term
complete metamorphosis
Definition
the four-stage process consisting of the egg, the larva, the pupa, and the adult.
Term
cold-blooded
Definition
animals that rely on the environment for warmth
Term
cartilage
Definition
a bonelike substance that is softer and more bendable than bone
Term
amphibian
Definition
a cold-blooded animal that lives in the water and on land.
Term
omnivore
Definition
an animal that eats both plants and animals
Term
herbivore
Definition
an animal that eats only plants.
Term
carnivore
Definition
an animal that eats only meat
Term
warm-blooded
Definition
animals that have a consistent internal temperature regardless of the environment
Term
insectivore
Definition
an animal that eats mainly insects
Term
nocturnal
Definition
active at night
Term
echolocation
Definition
a technique used by some animals that involves making high-frequency clicks that bounce off objects and allow the animals to judge distance based on the time it takes the sound to return.
Term
pride
Definition
a group of lions that live together
Term
blubber
Definition
a fatty substance that insulates some animals against cold.
Term
pods
Definition
a group of whales
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