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Life Science Test # 1
Terms for test 70 terms
68
Science
7th Grade
10/28/2009

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Term
Sessile
Definition
An organism that cannot move becasue it is attached to something. Ex. Barnacle, sponge, oak tree, coral.
Term
Motile
Definition
An orgnaism that can move it is not attached to anything. Ex. Humans, Rats, Sharks, birds, sea urchin.
Term
Unicellular
Definition
An organism that is composed of only one cell. Cannot see without microscopes. Ex. Euglena, amoeba, yeast, bacteria, viruses.
Term
Multicellular
Definition
An organism that is made of two or more cells together. All plants and animals that you can see with your eye. Ex. cats, slugs, humans, mice.
Term
Endothermic
Definition
An organism that can maintain a certain body temerature all year round. Only birds and mammals. Warm blooded. Ex. Humans: 98.6, Rats: 100.0, Hummingbirds:105.0.
Term
Ectothermic
Definition
An organism that can not maintain a certain body temerature. Their temperature changes with the environment. Need the sun to warm/cool body.Cold blooded. Ex. Worms, slugs, snakes, fish, lizards.
Term
Advantages to being Endothermic
Definition
Maintain same body temerature- not dependent on environment to heat/cool body. Can move quickly without having to be warmed by sun.
Term
Disadvantages to being Endothermic
Definition
Takes a lot of energy to maintain body temerature. Have to eat a lot of food to maintain body temerature.
Term
Advantages to being Ectothermic
Definition
Can warm/cool body using sun/shade saves energy. Do not have to eat often- once a week becasue energy saved from not maintaning body heat.
Term
Disadvantages to being Ectothermic
Definition
Dependent on the environment to heat,cool body. Often have to hibernate or estivate due to the environment. Cannot move fast without warming body in the sun.
Term
Vertebrate
Definition
An animal that has a backbone, amphibians and fish. Ex. Humans, cats, dogs, and mice.
Term
Invertebrate
Definition
An animal that does not have a backbone. All protozoans and worms. Ex. Euglena, starfish, coral, and tapeworms.
Term
Autotroph
Definition
An orgnaism that can produce it own food by using the sun to convert solar energy into food. All plants and algae, and phtoplankton are autotrophs.All ahve chlorophll. Ex. Euglena, Volvox, moss, azaelas, cypress oak trees, and grass.
Term
Heterotroph
Definition
An organism that can not produce its own energy from the sun, instead they must eat other organisms for energy. All animals are heterotrophs. Ex. Owl, Humans, rat, monkey, snail, and fish.
Term
Herivore
Definition
A consumer that eats only plants. Ex. Snail, cow, sheep.
Term
Carnivore
Definition
A consumer that eats only animals. Ex. Lions, House cat, dog, wolf.
Term
Omnivore
Definition
A consumer that eats both plants and animals. Ex. Beras, racoons, humans, pigs.
Term
Decomposer
Definition
An organism that breaks down chemicals from wastes and dead organisms and returns important materials to the soil. Ex. Mushrooms, mold, mildew, bacteria.
Term
Filter Feeder
Definition
Filters off of plankton out of the water. Ex. Sponges, oyster, corals, marine worm.
Term
Scavenger
Definition
Eats anything dead or alive. Racoon, buzzard, fox, and opossum.
Term
Hydroskelton
Definition
An organism that has a fluid filled body. Their skelton is made of water(liquids). They have very soft bodies. Ex. Sponge, Earthworm, tapeworm, sea anemone, slug, jellyfish.
Term
Exoskelton
Definition
An organism that has a skelton on the outside of its body. Ex. Crab, Lobster, crawfish, Shrimp, beetle, ant, oyster, mussel, snail.
Term
Endoskelton
Definition
An organism that has a skelton on the inside of its body. Ex. Humans, horse, dog, cow, snake, lizards, frog.
Term
Bilateral Symmetry
Definition
An organism that has an equal left and right hand side- you can split it down the middle and the two sides are mirror images. Usually are fast. Ex. Humans, Dogs, horses, beetle, lizard, cow, snake, slug, fish, shark, some sponges.
Term
Radial Symmetry
Definition
An organism that has a center disk and all body parts radiate from center. many are sessile. Ex Starfish, sea anemone, sea urchin, jellyfish, some sponges.
Term
Spherical Symmetry
Definition
An organism that has a circular or round shape. Usually slow moving. Ex. Diatom, yeast, cactus, radiolarians.
Term
Asymertcial Symmetry
Definition
An organism that does not have any symmetry it is irregular shaped. Usually slow moving or sessile. Ex Amoebas, fiddler crabs, some corals, flounder, some sponges.
Term
Segmented
Definition
An organism that has a body that is divided into repeated sections. Advantage you can live if you get cut into pieces. Ex. Earthworm, leech, tapeworm, crab, shrimp, lobster, beetle, millipede.
Term
Nonsegmented
Definition
An organism that does not have a body divided into sections. Ex Humans, dogs, rats, horses, snails, slugs, snakes.
Term
Dorsal
Definition
Vertebrates- Side with backbone. Invertebrates- Top side or side opposite of mouth(aboral).
Term
Ventral
Definition
Vertebrates- Side with abdomen. Invertebrates- Undeside or side with the mouth(Oral).
Term
Anterior
Definition
End of body with head and or sensory organs.
Term
Posterior
Definition
End of body with anus.
Term
Caudal
Definition
Only refers to auatic animals with tails. tail is the caudal end.
Term
Camoflage
Definition
When an organism blends into it's environment. very hard to see. This is to hide from predators and catch prey.Ex. Rattlesnakes, sharks, flounder, lizards, chamelons.
Term
Warning Coloration
Definition
When an dangerous animal has a color or color combination that siganls danger. In nature these are bright colors or combinations; black and white, black and yellow, black and red, black and orange. Ex. Black Widow, panda bear, tiger, monarch butterfly, coral snake.
Term
Mimicry
Definition
When an non dangerous animal copies the coloration of an dangerous animal or when an animal tries to fool predators with optional illusions. Ex. Eye Spots on moth's wings, penguin, king snake, painted lady butterfly.
Term
Hermaphodite
Definition
An organism with both male and female sex organs. This is usually found in sessile or slow moving organisms becasue they don't easily find a mate. Instead they release egg or sperm cells into the air or water and fertilize the eggs of another individual. They cannot fertilize their own eggs. Ex. Earthworms, sponges, coral, tapeworms, starfish, many plants.
Term
Budding
Definition
Asexual reproduction in which an organism forms a bulge on its side the bulge grwons then pinches off to form a new adult. Ex. yeast, sponges, sea anemone, hydra.
Term
Fragmentation
Definition
Asexual reproduction in which a piece of an organism breaks off and the piece forms into a new adult. Ex. Starfish, sponges, tapeworms, planarian.
Term
Binary Fission
Definition
Asexual reproduction in which a single celled organism splits into two new adults. Ex. Amoeba, paramerium, Euglena, viruses, bacteria.
Term
Regeneration
Definition
Not reproduction; when an organsim can grow back a missing body part. Ex. Lizard growing back tail, starfish growning back arm, crab growning back claw.
Term
Internal Fertilization
Definition
When the egg is fertilized inside the females body. Ex. Humans, Lions, snakes, chickens.
Term
External Fertilization
Definition
When the egg is fertilized outside the females body. The females lay the eggs and then the male fertlilizes them outside her body. Ex. Bass, catfish, frogs, salmon, salamanders.
Term
Innate behaviior
Definition
A behavior that is inherited you automatically know how to do it. You do not learn the behavior. Ex. migration, hibernation, mating, eating, making babbling noises, walking, crying.
Term
Learned Behaviors
Definition
A behavior that is taught to an organism you are not born knowing how to do it. Ex. Washing your food, table manners, raising your hand before talking, learning a language, playing a sport.
Term
Estivation
Definition
When an animal goes into hiding and slows downs it bodily functions during the summer. This happens when it is extremly hot and it is difficult to find food or easy to get over heated/dry out. Ex. Frogs bury themselves in mud during a drought; after rain they come back out. Desert Squirrels & mice estivate during the summer months.
Term
Hibernation
Definition
When an animal goes into hiding and slows down its bodily functions during the winter. This happens when it is extremely cold and it is difficult to find food. Ex. polar bears, grizzly bears, squirrels, grasshoppers, snakes, frogs.
Term
Migration
Definition
When animals travel long distances to find food, find a mate, or to have a offspring. Ex. Ducks, geese, whales, salmon, hummingbirds.
Term
Biological Clock
Definition
Long term(monthly or yearly) innate, natural cycles. Ex. estivation, migratio, hibernation, child bearing years, menopause.
Term
Circadian Rhythm
Definition
A short term or daily natural cycle.Ex. Hunger cycle, sleep cycle, daily moods.
Term
Open Circulatory System
Definition
Blood is not conatined in blood vessels blood just flows, through the body and organs. Ex. Jellyfish, tapeworms, sponges, most insects.
Term
Closed Circulatory System
Definition
Blood is conatined in blood vessels. Ex. Humans, earthworms, dogs, cats.
Term
Ectoderm
Definition
Outer most body layer.(skin).
Term
Mesoderm
Definition
Middle body layer (muscles and fat)
Term
Endoderm
Definition
Inner most body layer (internal organs)
Term
Nocturnal
Definition
Organisms that are active at night; sleep during the day. Ex. Owls, mice, bats, rabbits, hamsters, cats, deer, snakes.
Term
Diurnal
Definition
Organisms that are active during the day;sleep at night. Ex. Humans, dogs, bluebirds, cows, squirrels.
Term
Territory
Definition
An area wher an organism lives , hunts, breeds, and raises their young.
Term
They will protect their territory by:
Definition
Making noises, body language, fighting, marking their territory with pheromones.
Term
Body Language
Definition
Using your body to show emotions.Ex.Showing teeth, wagging tail.
Term
Making noises
Definition
Barking, growling, howling, purring, grunting
Term
Marking their territory with pheromones
Definition
smells.Ex.urine, feces, musk, antler marks, claw marks.
Term
Courtship Rituals
Definition
Dances, moving antenna,etc.
Term
Pheromones
Definition
Chemically produced odors(smells)that an organism can produce.
Term
Four Main Functions of Pheromones
Definition
Attract a mate-use must to attract others; Scare a predator-Use body odor to scare; Mark their territory-Urinate around territory; Signal danger-odor to relay fear/danger.
Term
Advantages of living in a group
Definition
Safer,numbers protect each other,can warn group of predators,hunt together,find mates easy,protectyoung.
Term
Disadvantages of living in a group
Definition
Have to share food,compete for mates, diseases spread,attracts predators.
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