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Science 7 Exam
Question | Answer |
---|---|
invertebrate | An animal without a backbone |
muscle tissue | Tissue made of muscle cells that allow animals to move. |
nervous tissue | Tissue made of nerve cells that enables coordinated movement and response to stimuli. |
central nervous system | The control center of the body that includes the brain and spinal cord. |
peripheral nervous system | Consists of nerves that connect all areas of the body to the central nervous system. |
nerve impulse | A wave of electrical activity transmitted between neurons. |
withdrawal reflex | An involuntary response to an outside stimulus. |
sensory nerves | Nerves that receive sensory stimuli |
motor nerves | Nerves that transmit signals to skeletal muscle |
cerebrum | The part of the brain that controls voluntary movements |
cerebellum | The part of the brain that keeps the body in balance. |
photoreceptors | Light-sensitive cells of the retina that convert light into nerve impulses. |
optic nerve | A nerve that carries nerve impulses from the eye to the brain. |
pupil | The hole in the eye through which light enters. |
image | A picture of an object formed where light rays meet |
cone cells | Photoreceptors that respond to color. |
rod cells | Photoreceptors that respond to light intensity. |
reproduction | The formation of new organisms of the same species. |
asexual reproduction | A type of reproduction that requires only one parent |
sexual reproduction | A type of reproduction that involves special cells called sex cells. |
sex cells | Special cells that contain half the number of chromosomes as body cells. |
meiosis | Cell division that produces sex cells with half the number of chromosomes. |
diploid | A double set of chromosomes. |
haploid | A half set of chromosomes. |
fertilization | The union of egg and sperm. |
zygote | A fertilized egg. |
embryo | An organism in its earliest stage of development. |
cell differentiation | The process of cell specialization. |
testes | Produce sprem and testosterone. |
hormone | A chemical that regulates body functions. |
semen | A mixture of sperm and fluid that is ejaculated during sexual intercourse. |
ovaries | Female organs that produce eggs and female hormones. |
ovulation | The release of a mature egg from the ovary. |
follicle | A structure of the ovary where an egg matures. |
implantation | The process in which an embryo becomes embedded in the lining of the uterus. |
umbilical cord | Contains arteries and veins that connect the embryo to the placenta. |
fetus | An embryo that has developed for 8 weeks and has formed the major structures. |
uterus | The organ where a baby grows and develops. |
adaptation | A adapted trait that helps an organism survive. |
evolution | The process of how organisms acquire adaptations over time. |
ancestor | An organism from which others have descended. |
cladogram | A tree like diagram that displays evolutionary relationships among living species and their ancestors. |
homologous structures | Body structures that have a common origin but do not necessarily perform the same function. |
vertebrates | Animals with a backbone. |
ecology | Science dealing with living beings and their surroundings. |
ecosystem | A group of living things and their surroundings. |
abiotic | Factors of the ecosystem which aren't alive. |
biotic | The organisms that share the environment. |
biome | The world's major ecosystems |
biosphere | The part of the planet that can support life. |
communities | All the organisms that interact in a certain area. |
populations | A group of individuals of the same species living in a given area. |
species | Different kind of organisms found on earth. |
habitat | A place where an organism lives. |
niche | The function of an organism in a community. |
producer | Organisms that make their own food. |
consumer | organisms that do not produce their own food. |
primary consumer | Organisms that eat plants. |
secondary consumer | Organisms that eat plants or other organisms. |
tertiary consumers | Organisms that eat other organisms. |
decomposer | Organisms that break down cells. |
symbiosis | An interaction between two species. |
mutualism | When both organisms benefit from each other. |
commensalism | When one organism benifits |
paratism | One organism that benifits from another's harm. |
biodiversity | All the species living in an area. |