7th Grade Word List - Science

Words for students of 7th Grade, the page is for science words (List 1), which are essential vocabulary for 7th Grade academic classes.
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 7th Grade: 7th Grade Word List - Science (List 1)
aerobic
Speak
enhancing respiratory and circulatory efficiency; depending on free oxygen or air
anaerobic
Speak
living or active in the absence of free oxygen
asexual reproduction
Speak
reproduction without the fusion of gametes
asteroids
Speak
any of numerous small celestial bodies that revolve around the sun
carbon cycle
Speak
a thermonuclear reaction in the interior of stars; the organic circulation of carbon from the atmosphere into organisms and back again
cell organelles
Speak
specialized part of a cell; analogous to an organ
chromosome
Speak
a structure in the cell nucleus that contains DNA
density
Speak
thickness; quantity of something per unit measure, especially per unit length, area, or volume
diffusion
Speak
act of dispersing or diffusing something
gene
Speak
a segment of DNA that is involved in producing a polypeptide chain
heredity
Speak
genetics; inheritance; genetic transmission of characteristics from parent to offspring
homeostasis
Speak
metabolic equilibrium actively maintained by several complex biological mechanisms that operate via the autonomic nervous system to offset disrupting changes
meiosis
Speak
cell division that produces reproductive cells in sexually reproducing organisms
mitosis
Speak
cell division in which the nucleus divides into nuclei containing the same number of chromosomes
organ
Speak
natural part or structure in animal or plant, capable of performing some special action
organisms
Speak
discrete and complete living thing, such as animal, plant, fungus or microorganism
osmosis
Speak
diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal
photosynthesis
Speak
chemical combination brought about by the action of light
qualitative change
Speak
changes in kind or type
quantitative change
Speak
an alteration in the number
respiration
Speak
breathing; process of inhaling and exhaling; oxidative process occurring within living cells
sexual reproduction
Speak
reproduction involving the union or fusion of a male and a female gamete
species diversity
Speak
the variety of species in a given region or area
tissue
Speak
groups of cells that make particular parts of the body; soft thin paper
transpiration
Speak
the process of giving off or exhaling water vapor through the skin or mucous membranes; the emission of water vapor from the leaves of plants
transport
Speak
carry from one place to another; carry away; deport