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7th Grade Science Final Exam Study Guide
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175
Science
7th Grade
05/22/2011

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Term
contractile vacuole
Definition
the cell structure that collects extra water from the cytoplasm and then expels it from the cell
Term
abdomen
Definition
the hind section of an arachnids body that contains its reproductive organs and part of its digestive tract; the hind section of an insect's body.
Term
abiotic factor
Definition
a nonliving part of an ecosystem.
Term
adaptation
Definition
a characteristic that helps an organism survive in its environment or reproduce.
Term
alga
Definition
a plantlike protist.
Term
algal bloom
Definition
the rapid growth of a population of algae.
Term
amphibian
Definition
an ectothermic vertebrate that spends its early life in water and its adulthood on land, returning to water to reproduce.
Term
angiosperm
Definition
a plant that produces seeds that are enclosed in a protective structure.
Term
antenna
Definition
an appendage on the head of some animals that contains sense organs.
Term
anus
Definition
the opening at the end of an organism's digestive system through which wastes exit.
Term
arachnid
Definition
an arthropod with only two body sections.
Term
arthropod
Definition
an invertebrate that has an external skeleton, a segmented body, and jointed attachments called appendages.
Term
atrium
Definition
Each of the two upper chambers of the heart that receives blood that comes into the heart.
Term
auxin
Definition
the plant hormone that speeds up the rate of growth in plant cells.
Term
behavior
Definition
all the actions an animal performs.
Term
bilateral symmetry
Definition
line symmetry; the quality of being divisible into two halves that are mirror images.
Term
biolumenessence
Definition
the production of light by a living organism.
Term
biotic factor
Definition
a living part of an ecosystem.
Term
bird
Definition
an endothermic vertebrate that has feathers and a four-chambered heart, and lays eggs.
Term
birth rate
Definition
the number of births in a population in a certain amount of time.
Term
bivalves
Definition
a mollusk that has two shells held together by hinges and strong muscles.
Term
bog
Definition
a wetland where sphagnum moss grows on top of acidic water.
Term
buoyant force
Definition
the force that water exerts upward on any underwater object.
Term
budding
Definition
a form of asexual reproduction in which a new organism grows out of the body of a parent.
Term
cambium
Definition
the layer of cells in a plant that produces new phloem and xylem cells.
Term
canines
Definition
sharply pointed teeth that stab food and tear into it.
Term
carnivore
Definition
an animal that eats only other animals.
Term
cartilage
Definition
a connective tissue that is more flexible than bone and that gives support to some parts of the body.
Term
cell
Definition
the basic unit of structure and function in living things.
Term
cell membrane
Definition
the outside boundary of a cell; controls which substances can enter or leave the cell.
Term
cephalopod
Definition
a mollusk with feet adapted to form tentacles around its mouth.
Term
chitin
Definition
the tough flexible material from which arthropod exoskeletons are made.
Term
chorodate
Definition
the pyllum whose members have a notochord, a nerve chord and slits in their throat area at some point in their lives.
Term
cilia
Definition
the hairlike projections on the outside of cells that move in a wave-like manner.
Term
claws
Definition
Term
cnidarian
Definition
animals whose stinging cells are used to capture prey and defend themselves, and who take their food into a hollow center of gravity.
Term
community
Definition
all the different populations that live together in a given area.
Term
competition
Definition
the struggle between organisms for the limited resources in a habitat.
Term
compound eye
Definition
Term
conditioning
Definition
the process of learning to connect a stimulus with a good or bad event.
Term
cone
Definition
the reproductive structure of a gymnosperm.
Term
connective tissue
Definition
a body tissue that provides supports for the body and connect all of its parts.
Term
consumer
Definition
an organism that obtains energy by feeding on other organisms.
Term
contour feather
Definition
a large feather that helps give shape to a bird's body.
Term
courtship behavior
Definition
the behavior that animals of the same species engage in to prepare for mating.
Term
crop
Definition
a bird's internal storage tank that allows it store food inside its body after swallowing it.
Term
crustacean
Definition
an arthropod that has two or three body sections, five or more pairs of legs, two pairs of antennae, and usually three pairs of appendages for chewing.
Term
cuticle
Definition
the waxy, waterproof layer, that covers the leaves and stems of some plants.
Term
cytoplasm
Definition
the region of a cell located inside the cell membrane (in prokaryotes) or between the cell membrane nucleus (eukaryotes); contains a gel-like material and cell organelles.
Term
death rate
Definition
the number of deaths in a certain amount of time.
Term
decomposer
Definition
an organism that breaks down large chemicals from dead organisms into small chemicals and returns important chemicals to the soil and water.
Term
diaphram
Definition
a large, dome shaped muscle that plays an important role in breathing
Term
dicot
Definition
an organism that two seed leaves
Term
down feather
Definition
short, fluffy feathers that trap heat and keep a bird warm
Term
echnoderm
Definition
a radially symmetrical invertebrate that lives on the ocean floor, and has a spiny internal skeleton
Term
ecology
Definition
the study of how living things interact with each other and their environment
Term
ecosystem
Definition
all living, and non-living things that interact in an area
Term
ectotherm
Definition
an animal whose body does not produce much internal heat
Term
embryo
Definition
the young plant that develops from the zygote. also, a developing human during the first 8 weeks after fertilization has occurred.
Term
endoskelaton
Definition
an internal skeleton.
Term
endotherm
Definition
an animal whose body controls and regulates its temperature
Term
environment
Definition
a habitat where animals live.
Term
epithelial tissue
Definition
a body tissue that covers the surface of the body, inside and out.
Term
estimate
Definition
an approximation of a number based on reasonable assumptions.
Term
eutrophication
Definition
the build up over time of nutrients in freshwater lakes and ponds that leads to an increase in the growth of algae
Term
exoskelaton
Definition
an outer skeleton.
Term
fertilization
Definition
the joining of a sperm cell and an egg cell.
Term
fish
Definition
a vertebrate that lives in the water and has fins.
Term
food chain
Definition
a series of events in which one organism eats another
Term
food web
Definition
the pattern of overlapping food chains in an ecosystem
Term
fossil
Definition
the preserved remains or traces of an organism that lived in the past.
Term
fruit
Definition
the ripened ovary and other structures that enclose one or more seed of an organism
Term
fruiting body
Definition
the reproductive hypha of a fungus
Term
gastropod
Definition
a mollusk with a single shell, or no shell
Term
germination
Definition
the early growth stage of the embryo plant in a seed
Term
gestation period
Definition
the length of time between fertilization and birth of a mammal
Term
gill
Definition
an organisms breathing organ that removes oxygen from water
Term
gizzard
Definition
a thick walled, muscular part of a birds stomach that squeezes and grinds partially digested food.
Term
gymnosperm
Definition
a plant that produces seeds that are not enclosed by a protective covering.
Term
habitat
Definition
the place where an organism lives and that provides the things that organisms need
Term
herbivore
Definition
an animal that eats only plants
Term
hibernation
Definition
a state of greatly reduced body activity that occurs during the winter
Term
homeostasis
Definition
the process by which an organisms internal environment is kept stable in spite of changes in the external environment
Term
hormone
Definition
a chemical that affects a plants growth and development
Term
host
Definition
an organism that provides a source of energy or a suitable environment for a virus or for another organism to live
Term
hypha
Definition
one of many branching, threadlike tubes that make up the body of a fungus.
Term
incisors
Definition
flat-edged teeth used to bite off and cut parts of food
Term
insight
Definition
the process of learning how to solve a problem or do something new by applying what you already know
Term
instinct
Definition
an inborn behavior pattern that animals performs correctly the first time
Term
insulator
Definition
a material that does not conduct heat well and thus, helps to prevent heat from escaping
Term
kidney
Definition
a major organ of the excretory system; eliminates urea, excess water, and other waste materials from the body
Term
larva
Definition
the immature form of an animal that looks very different from the adult
Term
learning
Definition
the process that leads to change in behavior based on practice or experience
Term
lichen
Definition
the combination of a fungus and either an alga or an autotrophic bacterium that live together in a mutualistic relationship
Term
lift
Definition
an upward force on an object that results from the difference in pressure between the upper and lower surfaces of the object.
Term
limiting factor
Definition
an environmental factor that prevents a population from increasing.
Term
mammal
Definition
an endothermic vertebrate with a four-chambered heart, skin covered with fur or hair, and has young fed with milk from the mother's body.
Term
mammary gland
Definition
the organs that produce the milk with which mammals feed their young.
Term
marsupial
Definition
a mammal whose young are born alive at an early stage of development, and which usually continue to develop in a pouch on the mother's body.
Term
medusa
Definition
the cnidarian body plan characterized by a bowl shape and which is adapted for a free-swimming life.
Term
metamorphosis
Definition
a process in which an animal's body undergoes dramatic changes in form during its life cycle.
Term
migration
Definition
the regular, periodic journey of an animal from one place to another and back again for the purpose of feeding or reproducing.
Term
molars
Definition
teeth that, along with premolars, grind and shred food into tiny bits.
Term
mollusk
Definition
an invertebrate with a soft, unsegmented body; most are protected by hard outer shells.
Term
molting
Definition
the process of shedding an outgrown exoskeleton.
Term
monocot
Definition
an angiosperm that has only one seed leaf
Term
monotreme
Definition
a mammal that lays eggs.
Term
muscle tissue
Definition
a body tissue that contracts or shortens, making body parts move.
Term
mutation
Definition
a change in a gene or chromosome.
Term
mutualism
Definition
a type of symbiosis in which both partners benefit from living together.
Term
niche
Definition
an organism's particular role in an ecosystem, or how it makes its living.
Term
nonvascular plant
Definition
a low-growing plant that lacks vascular tissue.
Term
notochord
Definition
a flexible rod that supports a chordate's back.
Term
nucleus
Definition
the control center of a cell that directs the cell's activities; contains the chemical instructions that direct all the cell's activities and determine the cell's characteristics.
Term
omnivore
Definition
an animal that eats both plants and animals.
Term
organ
Definition
a structure in the body that is composed of different kinds of tissue.
Term
organ system
Definition
a group of organs that work together to perform a major function in the body.
Term
ovary
Definition
a protective structure in plants that encloses the developing seeds. Also, an organ of the female reproductive system in which eggs and estrogen are produced.
Term
ovule
Definition
a plant structure in seed plants that contains an egg cell.
Term
parasite
Definition
an organism that lives on or in a host and causes harm to the host.
Term
parasitism
Definition
a relationship in which one organism lives on or inside another AND harms it.
Term
peat
Definition
the blackish-brown material consisting of compressed layers of dead sphagnum mosses that grow in bogs.
Term
pre-molars
Definition
teeth that, along with molars,grind and shred food into tiny bits.
Term
petal
Definition
one of the colorful, leaflike structures of a plant.
Term
pheromone
Definition
a chemical released by one animal that affects the behavior of another animal of the same species.
Term
phloem
Definition
the vascular tissue through which food moves in some plants.
Term
pigmint
Definition
a colored chemical compound that absorbs light, producing color.
Term
pistil
Definition
the female reproductive parts of a flower.
Term
placenta
Definition
a membrane that becomes the link between the developing embryo or fetus and the mother.
Term
placental mammal
Definition
a mammal that develops inside its mother's body until its body systems can function independently.
Term
pollination
Definition
the transfer of pollen from male reproductive structures to female reproductive structures in plants.
Term
pollen
Definition
tiny particles produced by plants that contain the microscopic cells that later become sperm cells.
Term
polyp
Definition
the cnidarian body plan characterized by a vaselike shape and which is usually adapted for life attached to an underwater surface.
Term
population
Definition
all the members of one species in a particular area.
Term
population density
Definition
the number of individuals in a specific area.
Term
predation
Definition
an interaction in which one organism hunts and kills another animal for food.
Term
predator
Definition
a carnivore that hunts and kills other animals for food and has adaptations that help it capture the animals it preys upon.
Term
prey
Definition
an animal that a predator feeds upon.
Term
producer
Definition
an organism that can make its own food.
Term
protozoan
Definition
an animal like protist
Term
pseudopod
Definition
a "flat foot" or temporary bulge of the cell membrane used for feeding or movement in some protozoans
Term
pyramid
Definition
Term
radial symmetry
Definition
the quality of having many lines of symmetry that all pass through a central point.
Term
radula
Definition
a flexible ribbon of teeth in mollusks.
Term
red tide
Definition
an algae bloom that occurs in salt water.
Term
regeneration
Definition
the ability of an organism to regrow body parts.
Term
reptile
Definition
an extothermic vertebrate with lungs and scaly skin; lays eggs with tough, leathery shells.
Term
response
Definition
Term
rhizoid
Definition
the thin rootlike structure that anchors a moss and absorbs water and nutrients for the plant.
Term
root cap
Definition
a structure that covers the tip of a root, protecting the root from injury hat covers the tip of a root,
Term
scavenger
Definition
a carnivore that feeds on the bodies of dead organisms.
Term
sedimentary rock
Definition
a type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together.
Term
seed
Definition
the plant structure that contains a young plant inside a protective covering.
Term
sepal
Definition
a leaflike structure that encloses the bud of a flower.
Term
spore
Definition
a tiny cell that is able to grow into a new organism.
Term
stamen
Definition
the male reproductive parts of a flower.
Term
stimulus
Definition
a change in an organism's surroundings that causes the organism to react.
Term
stomata
Definition
the small opening on the undersides of most leaves through which oxygen and carbon dioxide can move.
Term
stress
Definition
the reaction of a person's body and mind to threatening, challenging or disturbing events.
Term
swim bladder
Definition
an internal gas-filled organ that helps a bony fish stabilize its body at different water depths.
Term
symbiosis
Definition
a close relationship between two organisms in which at least one of the organisms benefits.
Term
territory
Definition
an area that is occupied and defended by an animal or group of animals.
Term
tissue
Definition
a group of similar cells that perform a specific function in an organism.
Term
trait
Definition
a characteristic that an organism can pass on to its offspring through its genes.
Term
trial & error learning
Definition
the learning that occurs when an animal learns to perform a behavior more and more skillfully through repeated practice.
Term
tropism
Definition
the growth response of a plant toward or away from a stimulus.
Term
urine
Definition
a watery fluid produced by the kidneys that contains urea and other waste materials
Term
uropod
Definition
Term
vascular tissue
Definition
the internal transporting tissue in some plants that is made up of tubelike structures.
Term
ventricle
Definition
a lower chamber of the heart that pumps blood out to the lungs and body.
Term
vertebrae
Definition
the bones that make up the backbone of an animal.
Term
xylem
Definition
the vascular tissue through which water and nutrients move in some plants.
Term
zygote
Definition
a fertilized egg, produced by the joining of sperm and egg.
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