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biological diversity
biological diversity
75
Science
9th Grade
09/18/2009

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Term
subphyla
Definition
a category of related classes within a phylum.
Term
niche
Definition
a habitat and habit
Term
ecosystem
Definition
a system formed by the interaction of a community of organisms with their environment
Term
genus
Definition
the usual major subdivision of a family or subfamily in the classification of organisms, usually consisting of more than one species
Term
natural selection
Definition
the process by which forms of life having traits that better enable them to adapt to specific environmental pressures, as predators, changes in climate, or competition for food or mates, will tend to survive and reproduce in greater numbers than others of their kind, thus ensuring the perpetuation of those favorable traits in succeeding generations
Term
population
Definition
the amount of one species in an habitat
Term
mutalism
Definition
a relationship between two species of organisms in which both benefit from the association
Term
phylum
Definition
the primary subdivision of a taxonomic kingdom, grouping together all classes of organisms that have the same body plan
Term
abiotic
Definition
non living
Term
biotic
Definition
living
Term
consumer
Definition
an organism, usually an animal, that feeds on plants or other animals
Term
decomposer
Definition
an organism, usually a bacterium or fungus, that breaks down the cells of dead plants and animals into simpler substances
Term
symbiosis
Definition
the living together of two dissimilar organisms, as in mutualism, commensalism, amensalism, or parasitism
Term
Dichotomous key
Definition
a key for the identification of organisms based on a series of choices between alternative characters
Term
evolution
Definition
change in the gene pool of a population from generation to generation by such processes as mutation, natural selection, and genetic drift
Term
biological diversity
Definition
the variety of species and
ecosystems on Earth and the ecological processes
of which they are a part; ecosystem diversity,
community diversity, and genetic diversity are
three main components
Term
species
Definition
living things of the same kind that are able
to reproduce successfully
Term
Speciation
Definition
the formation of new species as a result of geographic, physiological, anatomical, or behavioral factors that prevent previously interbreeding populations from breeding with each other
Term
Structural/behavioural adaptation
Definition
Term
Diversity index
Definition
statistic which is intended to measure the biodiversity of an ecosystem
Term
enviroment
Definition
the air, water, minerals, organisms, and all other external factors surrounding and affecting a given organism at any time.
Term
broad/narrow niche
Definition
Term
Generalist/specialist
Definition
Term
specialization
Definition
the adaptation of an organism or a part of an organism to a specific function or condition in response to environmental conditions
Term
Embryo
Definition
An undeveloped organism in its beginning stages
Term
Aquaculture
Definition
farming of ocean and freshwater plants and animals for human consumption
Term
spores
Definition
a small, usually one-celled reproductive structure produced by seedless plants, algae, fungi, and some protozoans that is capable of developing into a new individual
Term
Stamen
Definition
the male reproductive organ of a flower
Term
Chromosome
Definition
A structure in which DNA is arranged and along which genes are located
Term
Somatic/sex cells
Definition
relating to or affecting the body, especially the body as considered to be separate from the mind
Term
DNA
Definition
a nucleic acid molecule in the form of a twisted double strand double helix that is the major component of chromosomes and carries genetic information. DNA, which is found in all living organisms except some viruses, reproduces itself and is the means by which hereditary characteristics pass from one generation to the next.
Term
Genetics
Definition
The study of how heritable characteristics are transmitted through generations of organisms
Term
Domestic
Definition
relating to or used in the home or everyday life within a household
Term
Pistil
Definition
The female reproductive organ of a flower
Term
Ovule
Definition
Sac containing the female sex cells (gametes) of a plant
Term
Genetic engineering
Definition
The intentional altering of the DNA of an organism if a population if organisms
Term
Clone
Definition
A genetically identical copy of an entire organism or of its cells or genes; cloning is the process of creating a clone
Term
competition
Definition
the struggle between organisms of the same or different species for limited resources such as food or light
Term
heritable
Definition
capable of being inherited; inheritable; hereditary.characteristics that are
transmitted from generation to generation, such as
eye colour
Term
reproductive
Definition
with or pertaining to reproduction: a reproductive process; reproductive organs
Term
asexual reproduction
Definition
reproduction, as budding, fission, or spore formation, not involving the union of gametes
Term
binary fission
Definition
a type of asexual reproduction in
amoebas and other organisms in which a parent
cell divides exactly into two identical cells
Term
Extirpation
Definition
to remove or destroy totally
Term
zoospores
Definition
an asexual spore produced by certain algae and some fungi, capable of moving about by means of flagella.
Term
meristem
Definition
The undifferentiated plant tissue from which new cells are formed, as that at the tip of a stem or root.
Term
transgenic
Definition
containing a gene or genes transferred from another species
Term
Biotechnologies
Definition
the use of living organisms or other biological systems in the manufacture of drugs or other products or for environmental management
Term
Competition
Definition
the struggle among organisms, both of the same and of different species, for food, space, and other vital requirements
Term
reproductive
Definition
Of, relating to, or capable of reproduction
Term
Bioindicator species
Definition
an organisim that offers a signal of the biological condition in a watershed
Term
Bioindicator species
Definition
an organisim that offers a signal of the biological condition in a watershed
Term
Bioindicator species
Definition
an organisim that offers a signal of the biological condition in a watershed
Term
Selective breeding
Definition
the intentional mating of two animals in an attempt to produce offspring with desirable characteristics or for the elimination of a trait
Term
seed bank
Definition
An organization dedicated to keeping old varieties of plants alive and available to breeders and gardeners by preserving seeds of these
Term
Zygospores
Definition
a cell formed by fusion of two similar gametes
Term
Bacterial conjugation
Definition
the transfer of genetic material between bacteria through direct cell-to-cell contact
Term
Zygote
Definition
is a cell that is the result of fertilization
Term
pollen tube
Definition
the protoplasmic tube that is extruded from a germinating pollen grain and grows toward the ovule.
Term
Cotyledon
Definition
the primary or rudimentary leaf of the embryo of seed plants
Term
Continuous variation
Definition
variation in phenotypic traits
Term
Discrete variation
Definition
the differences in characteristics that have a defined form
Term
Mutation
Definition
a sudden departure from the parent type in one or more heritable characteristics
Term
Mutagen
Definition
a substance or preparation capable of inducing mutation
Term
Global treaties
Definition
A formal agreement between two or more partys
Term
Protected areas
Definition
locations which receive protection because of their environmental, cultural or similar value
Term
chromatid
Definition
one of two identical chromosomal strands into which a chromosome splits longitudinally preparatory to cell division
Term
centromere
Definition
a specialized structure on the chromosome, appearing during cell division as the constricted central region where the two chromatids are held together and form an X shape.
Term
chromosome
Definition
1.A threadlike linear strand of DNA and associated proteins in the nucleus of eukaryotic cells that carries the genes and functions in the transmission of hereditary information
Term
mutations
Definition
a sudden departure from the parent type in one or more heritable characteristics, caused by a change in a gene or a chromosome
Term
germ cell
Definition
the sexual reproductive cell at any stage from the primordial cell to the mature gamete
Term
somatic cells
Definition
cells that take part in the formation of the body, becoming differentiated into the various tissues, organs, etc
Term
diploid
Definition
having two similar complements of chromosomes
Term
haploid
Definition
a single set of chromosomes
Term
extinction
Definition
there is no more of a snigle species in the world
Term
endangered
Definition
there is so little ofthat specie left, people are worried if there is enough varation for that specie to survive
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