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Obj 2 - Living Systems/ Enviroment
Texas TAKS Prep - Objective 2
130
Science
8th Grade
01/05/2010

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Term
Allele
Definition
one of a set of genes that control a particular trait
Term
Aquatic Biome
Definition
exists in or near water; two major types: saltwater and freshwater
Term
Arteries
Definition
carry blood away from the heart
Term
Behavior
Definition
refers to the actions or reactions of an organism
Term
Binary Fission
Definition
when an organism splits into two organisms
Term
Biodiversity
Definition
the variety of life in an ecosystem
Term
Biomass
Definition
organic waste and matter from dead plants and animals that can be used as a source of energy
Term
Biome
Definition
a place that has the same climate, plant life, and animal life over a vast area
Term
Blood
Definition
a fluid that is carried by the circulatory system
Term
Blood Pressure
Definition
the force that blood exerts against the walls of blood vessels
Term
Bone marrow
Definition
fill the spongy bone inside the hard, or compact bone, make blood cells
Term
Brain
Definition
is the control center of the nervous system, made up of the cerebrum, cerebellum, and medulla
Term
Capillaries
Definition
connect veins to arteries
Term
Cardiac muscles
Definition
involuntary muscles in the heart
Term
Carnivores
Definition
consumers that get their energy from eating only other consumers
Term
Cartilage
Definition
a softer and more flexible than bone but also gives support
Term
Cell Membrane
Definition
surrounds the cell and holds it together
Term
Cell Wall
Definition
the stiff covering over the cell membrane in plant cells
Term
Cells
Definition
the basic units of life containing organelles that perform specific functions
Term
Cellular respiration
Definition
in both plant and animal cell, is the process by which cells changes stored glucose into energy for life’s function
Term
Chemical Digestion
Definition
the process that chemically changes food into molecules called nutrients so that it can be transported around the body
Term
Chlorophyll
Definition
a green material in plant cells that traps the energy in sunlight
Term
Chloroplast
Definition
in plants, organelles that contain the green pigments chlorophyll, which gathers energy from the sun
Term
Circulatory system
Definition
a system that function in transporting materials around the body
Term
Commensalism
Definition
a symbiotic relationship in which one species benefits, the other is unaffected
Term
Composting
Definition
a process in which organic wastes, such as food and yard wastes, decompose naturally
Term
Coniferous Tree
Definition
trees that have cones and thin, needle-shaped leaves that stay green throughout the year
Term
Consumer
Definition
an organism that gets its energy from eating other organisms
Term
Coral Reef
Definition
form in the warm, shallow waters off continents; a living organism consisting of both animal and algae tissues
Term
Decomposers
Definition
organism that feed on and break down dead plant or animal matter; break down waste from other organisms and decompose dead animal and plant matter into nutrients that can be used by producers
Term
Deserts
Definition
dry biomes with little plant life because soils are poor
Term
Digestive system
Definition
made organs that function in breaking food down into usable forms
Term
DNA
Definition
a long, tightly coiled molecules in the nucleus, bundled in to chromosomes
Term
Dominant
Definition
allele is expressed or visible in the organism
Term
Ecological Succession
Definition
a gradual or natural change in an ecosystem over hundreds or thousands of years
Term
Endocrine Glands
Definition
pituitary gland, adrenal, thyroid, pancreas, ovaries, testes
Term
Endocrine System
Definition
a system made of glands that secrete hormones to help control and coordinate activities in the body
Term
Endoplasmic Reticulum
Definition
packages proteins, used for transportation in the cell
Term
Energy Pyramid
Definition
shows how the available energy source for consumers decreases at each level of a food chain; only 10% of the energy in a lower level can be used as energy by the next higher level
Term
Enzymes
Definition
chemicals that speed up chemical reactions
Term
Equilibrium
Definition
a stable, balanced condition with a system
Term
Estuaries
Definition
areas where freshwater streams or rivers merge with the ocean
Term
Excretory system
Definition
made of organs that function in eliminating liquid and gaseous waste from the body
Term
Feedback Mechanism
Definition
a process that is controlled by receptors that can stop or start an action
Term
Food Chain
Definition
a model that describes the way chemical energy passes from one organism to another; producers form the first link in the food chain
Term
Food Web
Definition
shows many different interactions among plants and animals; many food chains connected together
Term
Freshwater Biomes
Definition
includes lakes and ponds, rivers and streams, and wetlands
Term
Genes
Definition
section of chromosomes that carry the information for a singe trait
Term
Genotype
Definition
an individual’s inherited combination of alleles
Term
Golgi Complex
Definition
process and moves proteins around the cell
Term
Grassland
Definition
a biome that is fairly dry, but has fertile soil that supports grasses and flowering plants
Term
Habitat
Definition
the external environment on which organisms depends for their survival
Term
Heart
Definition
a muscle that pumps bloods through the body
Term
Herbivores
Definition
consumers that get their energy from eating only plants
Term
Heredity
Definition
the way in which traits are passed from parent to offspring
Term
Heterozygous
Definition
two alleles for a trait are different, hybrid, Tt, Ss, Rr
Term
Homeostasis
Definition
the maintenance of a stable internal environment within an organism
Term
Homozygous
Definition
two alleles for a trait are the same, purebred, TT, SS, rr
Term
Hormones
Definition
chemical messengers for regulating body function, that are secreted by endocrine glands directly into the bloodstream
Term
Immune system
Definition
the body’s system of defense against pathogens
Term
Incomplete dominance
Definition
the alleles that are neither dominant nor recessive
Term
Inherited traits
Definition
characteristics that are received from the genes of the organisms parents
Term
Innate behavior
Definition
an inherited behavior that is influenced by genes and does not depend on learning
Term
Instinct
Definition
an innate complex pattern of behavior, often in response to a specific stimulus
Term
Integumentary System
Definition
made up of skin, hair, and nails, protects the body and regulates body temperature
Term
Intertidal Zone
Definition
the near-shore area between areas of high and low tide
Term
Joint
Definition
a place where two or more bones meet
Term
Lakes and Ponds
Definition
open areas of freshwater
Term
Learned behavior
Definition
a behavior that is acquired through experience
Term
Ligaments
Definition
connects bones to bones
Term
Limiting Factors
Definition
factors that can limit the growth of a population; ex. sunlight, oxygen, water, temperature, biotic factors, human activities
Term
Lymph
Definition
a liquid that leaks out of capillaries and surrounds body tissues and cells
Term
Lymph nodes
Definition
masses of tissue along lymph vessels that filter the lymph and destroy bacteria
Term
Lymphatic system
Definition
a system of vessels that move excess lymph
Term
Lysosomes
Definition
traps and digest waste material and foreign objects
Term
Marine
Definition
saltwater; regions range from the open ocean to near-shore areas
Term
Mechanical Digestion
Definition
the breaking down of food into smaller pieces by chewing and be the movements of the stomach
Term
Meiosis
Definition
the process of cell division when the daughter cells (egg and sperm) with half the number of chromosomes
Term
Mitochondria
Definition
powerhouse of the cell, breaks sugars down into energy
Term
Mitosis
Definition
the process of cell division when the daughter cells have exactly the came number of chromosomes as the parent cells
Term
Multicellular
Definition
organisms are made of many cells
Term
Muscular system
Definition
made up of three different types of muscles
Term
Mutualism
Definition
a symbiotic relationship in which both species benefit
Term
Neritic Zone
Definition
consists of the water over the continental shelf
Term
Nervous system
Definition
the body’s control systems and is composed of the brain, spinal cord, and nerves
Term
Neurons
Definition
nerve cells
Term
Nucleus
Definition
controls cell activities, contains DNA
Term
Nutrients
Definition
chemical substances found in foods needed for growth, energy, and carrying out life processes
Term
Omnivores
Definition
consumers that get their energy from eating both plants and other consumers
Term
Organ
Definition
a group of tissues working together to perform a function
Term
Organ System
Definition
a group of organs working together to perform a function
Term
Overpopulation
Definition
occurs when too many organisms move into an ecosystem, stressing the ecosystem’s abiotic and biotic results, as well as the quality of life
Term
Parasitism
Definition
a symbiotic relationship in which one species benefits, the other is harmed
Term
Pathogens
Definition
disease causing organisms such as bacteria, viruses, and fungi
Term
Phenotype
Definition
an individual’s inherited appearance
Term
Photosynthesis
Definition
the process by which organisms produce their own food using the sun’s radiant energy, and water and carbon dioxide from the environment; sugar and oxygen are made during photosynthesis; sun’s radiant energy is transferred into chemical energy stored as sugar
Term
Photosynthesis
Definition
the process by which plant cells take in carbon dioxide and water, then use the suns energy to convert it into glucose, releasing oxygen
Term
Primary consumer
Definition
eats only producers; they are herbivores
Term
Primary Succession
Definition
takes place where organisms were not previously present
Term
Producer
Definition
an organism that makes its own food using radiant energy from the sun
Term
Punnett Square
Definition
a graphic organizer used to predict the possible results of a genetic cross
Term
Radiant Energy
Definition
energy given off by the sun in the form of waves; the main source of energy for living organisms on Earth
Term
Recessive
Definition
allele is not expressed when paired with a dominant trait
Term
Reproduction
Definition
the processes by which living things produce offspring
Term
Reproductive system
Definition
responsible for the production of offspring
Term
Respiratory System
Definition
functions to transport oxygen into the body and carbon dioxide out
Term
Ribosome’s
Definition
joins together amino acids to make proteins, which are used to build and repair cells
Term
Rivers and Streams
Definition
bodies of flowing water moving in one direction
Term
Secondary Consumer
Definition
eats primary consumers
Term
Secondary Succession
Definition
a process that occurs when an existing ecosystem is disturbed by events such as floods, fires, or changes in climate
Term
Skeletal muscles
Definition
voluntary muscles that you can control them when you move
Term
Skeletal System
Definition
systems made up of bones, cartilage, ligaments and tendons
Term
Smooth muscles
Definition
involuntary muscles in the lining of your digestive tract and blood vessels
Term
Social behavior
Definition
a tendency among animals to live together
Term
Stable Ecosystem
Definition
maintain their balance because they have a great deal of biodiversity
Term
Symbiosis
Definition
a close interaction between organisms
Term
System
Definition
a group of independent parts working together
Term
Taiga
Definition
a coniferous forest biome found at higher latitudes than temperate forests; colder and receive a lot of rain and snow
Term
Temperate Deciduous Forests
Definition
forests that receive less rain than tropical rain forests; warm in the summer and cold in the winter
Term
Tendons
Definition
connects bones to muscles
Term
Terrestrial biome
Definition
a biome on land
Term
Tertiary Consumer
Definition
eats secondary consumers
Term
Tissue
Definition
a group of cells working together to perform a function
Term
Tropical Rainforests
Definition
a biome that has consistently high temperatures and a lot of rain which allows thick, tall forests to grow, along with the world’s greatest diversity of plants and animals
Term
Tropism
Definition
an instinctive behavior in which an organism turns toward or away
Term
Tundra
Definition
found at polar latitudes; very cold with little rainfall
Term
Unicellular
Definition
organisms are made of only one cell
Term
Vacuole
Definition
vacuoles store water and other materials
Term
Veins
Definition
carry blood to the heart
Term
Wetlands
Definition
areas of shallow, standing water, such as marshes, swamps, and blogs; have the greatest diversity of all aquatic ecosystems
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