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Combined Sets

2nd 9-Weeks DA 7th Grade Science Review 2019 - 20

TermDefinition
CELL Basic structural and functional unit of living organisms.
TISSUE Large mass of similar cells that make up a part of an organism and perform the same specific function.
ORGAN Large collection of similar tissue that make up a part of an organism and performs a specific and specialized function of the body.
ORGAN SYSTEM Composed of several organs working together to perform specific and vital functions.
ORGANISM Individual form of life that is capable of growing, taking in nutrients, and usually reproducing (organ systems working together); self-contained living thing.
ORGANELLE Tiny cell structure that carries out a specific function within the cell.
POPULATION Group of individuals of the same species that live in the same area.
STIMULUS Action or condition that provokes a response.
RESPONSE Change in a system resulting from a stimulus.
HOMEOSTASIS Tendency of an organism or cell to maintain a balanced state so as to maintain health and function.
PATHOGEN Microorganism or virus that can cause disease.
FIGHT-OR-FLIGHT Short-term physiological changes in response to stress that prepare the body for intense activity to avoid harm.
TROPISM Turning or bending movement of living organisms toward or away from an external stimulus, such as light, gravity, touch, water, etc.
PHOTOTROPISM Response of a plant to grow toward or away from light.
GRAVITROPISM/ GEOTROPISM Plant’s growth in response to the force exerted upon it by gravity.
HEREDITY Transfer of genetic information from parent to offspring.
DEOXYRIBONUCLEIC ACID (DNA) Contains information that forms the hereditary material of all cells.
CHROMOSOME Single, highly organized and structured piece of DNA.
GENES Basic physical and functional unit of heredity made up of DNA.
GENOTYPE Exact genetic information carried by a single individual.
PHENOTYPE Physical appearance of an organism.
DOMINANT Allele that is always expressed.
RECESSIVE Allele that is only expressed if there is no different allele present.
TRAIT Characteristic of an organism; can be genetic or acquired.
ALLELE Different versions of a gene.
HOMOZYGOUS Having two identical alleles for a particular trait.
HETEROZYGOUS Having 2 different alleles for a particular trait.
NUCLEUS Membrane-bound structure in eukaryotic cells that contains the DNA.
ASEXUAL REPRODUCTION Reproductive process that involves 1 parent & produces offspring identical to the parent.
SEXUAL REPRODUCTION Reproductive process involving 2 parents whose genetic material is combined to produce a new organism different from themselves.
BINARY FISSION Type of asexual reproduction in which 1 cell divides to form 2 identical cells, such as occurs in prokaryotic cells.
BUDDING Type of asexual reproduction in which an offspring grows out of the parent organism.
VEGETATIVE PROPAGATION Type of asexual reproduction by which 1 plant produces new plants that are genetically identical to the parent plant.
OFFSPRING Product of reproduction, a new organism produced by one or more parents.
UNIFORM The same all the way through; consistent.
DIVERSE Different; varied.
PHYSICAL CHANGE Change to a substance WITHOUT forming a new substance; e.g. breaking substance into smaller particles, changing objects' shape, phase changes, etc.
PHASE CHANGE Type of PHYSICAL change in which: 1. Solids can MELT into Liquids 2. Liquids can EVAPORATE into Gases 3. Gases can CONDENSE into Liquids 4. Liquids can FREEZE into Solids The produced substance is the SAME as the original substance.
CHEMICAL CHANGE Change that alters the identity of a substance, resulting in a NEW substance or substances with different properties; e.g. burning something, exposure to air &/or water, combining different chemicals, pulling compounds apart, etc.
CITY - GIRLS - LEAVE - THEIR - PHONES - ON Mnemonic device to help remember the 6 evidences of a CHEMICAL change: C = COLOR change G = GAS formation (not phase change) L = LIGHT produced T = TEMPERATURE change (not phase change) P = PRECIPITATE formation O = ODOR produced
PRECIPITATE Solid produced when 2 different liquids are combined; the result of a CHEMICAL change.
PHYSICAL PROPERTY Characteristic of a pure substance that can be observed without changing it into another substance.
CHEMICAL PROPERTY Characteristic of a pure substance that describes its ability to change into different substances.
FORCE Push or pull that can change the motion of an object.
MOTION Change in an object's position with respect to time & in comparison to the position of other objects used as reference points.
GERMINATION Process by which a plant grows from a seed, a.k.a. seedling emergence.
VACUOLE Organelle in cell cytoplasm; functions to store water, nutrients, & wastes; 1 large central unit in plant cells, several small units in animal cells.
TURGOR PRESSURE Force of water molecules against the cell wall that allows plants to stand up straight; "turg = swollen."
TROPISM Turning of all or part of an organism in a particular direction in response to an external stimulus, e.g. gravity, light, water, touch, heat, etc.
PHOTOTROPISM Orientation of a plant or other organism in response to light, either toward or away from the source of light; "photo = light."
HYDROTROPISM Growth or turning of plant roots toward or away from moisture; "hydro = water."
GEOTROPISM/ GRAVITROPISM Plant’s growth in response to the force exerted upon it by gravity; "geo = earth" & "gravi = gravity."
WILT Become limp or droopy due to heat, loss of water, or disease.
TURGID State of plant cells when their vacuoles are filled with water, causing the plant leaves to stand upright; "turg = swollen."
BLOOD Liquid that circulates through the body carrying nutrients, oxygen, & waste products.
HEART Muscular organ that pumps blood through the circulatory system.
BLOOD VESSELS Structures that carry blood through the tissues & organs in a body; veins & arteries.
CIRCULATION Movement around something, especially that of fluid in a closed system; "circ = ring."
BLOOD PRESSURE Pressure of blood in the circulatory system; measured for diagnosis due to close relation to the force & rate of the heartbeat.
Created by: trauberk