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Environmental Science Definitions
defintions for final exam
103
Environmental Studies
Undergraduate 2
05/10/2016

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Term
Acidic
Definition
A substance that has more hyrogen ion activity than hydroxyl activity.
Term
Adaptation
Definition
A genetically-controlled characteristic that helps organisms survive and reproduce in their environment.
Term
Angiosperms
Definition
Flowering plants that produce seeds in fruit.
Term
Anther
Definition
The upper portion of the stamen containing pollen grains.
Term
Arthropods
Definition
Any of the numerous invertebrate organisms which includes insects, spiders, centipedes and millipedes.
Term
Bark
Definition
The outer layer of a tree trunk used to protect the tree from insects, disease, and fires.
Term
Basic
Definition
A substance that has more hydroxyl ion activity than hydrogen ion activity.
Term
Bole
Definition
The trunk of a tree, which is the central support giving the tree its strength and long shape.
Term
Cambium
Definition
The part that adds thickness to a tree. The living dividing tissue.
Term
Camouflage
Definition
A coloration or form adaptation by a species designed to hide from predators.
Term
Canopy
Definition
The uppermost layer of a forest.
Term
Carnivores
Definition
A consumer that eats only other consumers.
Term
Chlorophyll
Definition
A green pigment found in plants that is necessary for the process of photosynthesis.
Term
Commensalism
Definition
A relationship between two species in which one species benefits and the other is neither harmed nor helped.
Term
Community
Definition
A group of interacting populations of different species in overlapping habitats.
Term
Competition
Definition
The relationship between species that attempt to use the same limited resources.
Term
Coniferous
Definition
Needle-leaved trees that usually produce seed cones.
Term
Crown Class
Definition
The position of a tree's height relative to the other trees in the stand.
Term
Cyanobacteria
Definition
A group of blue-green bacteria that live through the world, mostly in water, but also on land. Can be a photobiont component of some lichens.
Term
Deciduous
Definition
Trees that lose their leaves during a particular season each year.
Term
Decomposers
Definition
Organisms that feed on dead plant and animal material.
Term
Dendrochronology
Definition
The study of climate change and other past events through the comparison of successive annual growth ring of trees.
Term
Deposition
Definition
Rock and organic materials that settle out within a water system.
Term
Detritivores
Definition
Decomposers. Receive energy from recycling nutrients by eating dead organisms.
Term
Dissolved Oxygen (DO)
Definition
The oxygen in a water solution as molecular oxygen. (O2)
Term
Disturbance
Definition
An event that disrupts or changes all or part of an ecosystem.
Term
Diversity
Definition
The variety in an ecosystem; usually refers to habitats or species.
Term
Dominant Trees
Definition
Trees that are at the top of the canopy.
Term
Ecology
Definition
The study of how living things interact with each other and with their nonliving environments.
Term
Ecosystem
Definition
All living organisms in a certain area as well as their physical environment.
Term
Erosion
Definition
Natural process of weathering by which material is removed from the earth's surface.
Term
Evenness
Definition
In terms of diversity, species evenness is determined by comparing the numbers of individuals within each species.
Term
Food Chain
Definition
The sequence in which energy is transferred from one organism to the next as each organism eats and is then eaten by another.
Term
Food Web
Definition
The interlocking, complex pattern of food chains in an ecosystem.
Term
Forest Floor
Definition
The lowest layer of a forest consisting of many organisms including insects, fungi,moss and lichen.
Term
Frond
Definition
The leaf of a fern.
Term
Germination
Definition
Ina plant seed, to sprout growth.
Term
Glide
Definition
Section of a water system where the water is moving faster than in a pool but without white water.
Term
Gymnosperms
Definition
Plants that produce seeds in cones.
Term
Habitat Structure
Definition
The shape, size and placement of vegetation- understory, mid-section, and overstory.
Term
Heartwood
Definition
The majority of a tree trunk's mass. Consists of old dead xylem cells that no longer carry water. It is usually darker than other parts of the tree and provides most of the support to a tree.
Term
Herbivores
Definition
Plant eaters. First level consumers.
Term
Herb Layer
Definition
The layer of a forest in between the shrub layer and the forest floor, made up of small plants.
Term
Host
Definition
An organism on which a parasite feeds.
Term
Hydroxyl Ion (OH-)
Definition
The highly reactive negative ion in a water molecule. A water molecule that has more hydroxyl ion activity than hydrogen ion activity is considered basic.
Term
Hydrogen Ion (H+)
Definition
The highly reactive positive ion in a water molecule. A water molecule that has more hydrogen ion activity than hydroxyl ion activity is considered acidic.
Term
Hypothesis
Definition
Implies insufficient evidence to provide more than a tentative explanation. An educated guess that is testable.
Term
Impermeable surfaces
Definition
Hard surfaces, like roads or roof tops that water cannot penetrate.
Term
Intermediate Trees
Definition
Trees that are just below the canopy in a forest.
Term
Invasive
Definition
Non-native species that invade,spread, and out compete the natural species.
Term
Kinetic Energy
Definition
The movement of molecules within a substance.
Term
Larva
Definition
The immature stage of an organism. Often times very different from the adult form.
Term
Law
Definition
Implies a statement of order and relation in nature that has been found to be invariable under the same conditions.
Term
Leaves
Definition
The food processing part of a tree where (generally) photosynthesis takes place.
Term
Lichen
Definition
A fungi, which has formed a successful alliance (a symbiotic relationship) with an algae.
Term
Macroinvertebrates
Definition
Animals without backbones large enough to identify with the unaided eye; often aquatic insects.
Term
Meander
Definition
Refers to water systems that follow a winding and turning course.
Term
Mutualism
Definition
A relationship between two species in which both benefit.
Term
Niche
Definition
The role of an organisms in an ecosystem.
Term
Nitrogen
Definition
A nutrient that is released when organic matter decomposes. The nutrient is critical to stimulating plant growth.
Term
Nymph
Definition
One of the young of any insect that undergoes incomplete metamorphosis.
Term
Omnivore
Definition
A consumer that eats both plants and animals.
Term
Overtopped Trees
Definition
Trees under the dominants and intermediate crown class layers in a forest.
Term
Ovule
Definition
A rudimentary seed of a plant that develops into a seed after fertilization.
Term
Parasitism
Definition
The relationship where a parasite receives resources from its host without killing it.
Term
Petals
Definition
Serve as a banner to attract pollinators and a landing platform.
Term
pH
Definition
The measure of the acidity or basicity of a substance.
Term
Phloem
Definition
A series of small tubes that transports the sap (food) from the leaves down to the roots of a tree.
Term
Phosphorus
Definition
A nutrient found in soil which aids in plant growth.
Term
Photobiont
Definition
The photosynthetic component of lichen.
Term
Photosynthesis
Definition
The process green plants use to produce food as sugar from carbon dioxide, water and sunlight.
Term
Pistil
Definition
The central organ of a flower which contains the female parts:stigma,style,ovary.
Term
Pool
Definition
Deep areas in a water system where the water is slow or swirling.
Term
Pollen
Definition
Fine, yellowish powder-like grains, which contain the male germ cells of a plant.
Term
Pollination
Definition
The transfer of pollen from another (male) to the stigma (female) of a plant from fertilization.
Term
Population
Definition
A group of individuals of the same species that live in a particular habitat.
Term
Potassium
Definition
A nutrient found in soil, which aids in plant growth and survival.
Term
Predation
Definition
The act of killing and eating another organism.
Term
Prey
Definition
An organism upon which a predator feeds.
Term
Riffle
Definition
Fast moving portion of a stream, characterized by white water. Also called rapids. Riffles are well oxygenated sections that provide great conditions for many aquatic organisms.
Term
Riparian Area
Definition
The vegetated area along the banks of a stream that is influenced by stream water.
Term
Scavengers
Definition
Organisms that feed on dead organisms.
Term
Sensitive Species
Definition
Referring to aquatic organisms that cannot survive in poor water quality conditions.
Term
Shrub Layer
Definition
The layer of the forest in between the understory and herb layers, made of shrubs.
Term
Springwood
Definition
Tree cambium (xylem) cells that are created in the beginning of the growing season. Usually larger and appear lighter than summerwood.
Term
Stamen
Definition
The male organ of the flower consisting of anther and filament, which produces the pollen.
Term
Stigma
Definition
The most elevated part of a flower's pistil, which receives the pollen.
Term
Stomata
Definition
Small holes in leaves, where oxygen and water is released into the atmosphere.
Term
Streamflow
Definition
The total volume of water that passes in a water system. Often expressed in cubic feet per second. (cfs)
Term
Substrate
Definition
The composition of rock materials and organic matter that make up a stream bottom.
Term
Succession
Definition
A pattern of on-going changes (a process) over time in the types of species in a community.
Term
Summerwood
Definition
Tree cambium (xylem) cells that are created towards the end of the growing season. Usually appear smaller and darker than springwood.
Term
Surface Runoff
Definition
The water that flows over the surface to the lowest point on the landscape after precipitation.
Term
Suspended Sediments
Definition
Floating materials in water that blocks light causing turbidity.
Term
Sustainability
Definition
Ability of the Earth's various systems, including human cultural systems and economies, to survive and adapt to changing environmental conditions indefinitely.
Term
Temperature
Definition
The measurement of moving molecules of kinetic energy within a substance.
Term
Theory
Definition
A proposed but unverified explanation. Implies greater range of evidence and greater likelihood of truth than a hypothesis.
Term
Tipping Point
Definition
Threshold level at which an environmental problem causes a fundamental and irreversible shift in the behavior of a system.
Term
Trophic Level
Definition
A step in the transfer of energy through an ecosystem. The level of a food chain that an organisms occupies. A category of organisms classified by what they eat.
Term
Turbidity
Definition
The amount of suspended matter in a water body. The measure of how cloudy or clear water is.
Term
Understory
Definition
The next layer down from the canopy of a forest. Also called a sub-canopy.
Term
Velocity
Definition
The measurement of how fast something is traveling, i.e, water
Term
Xylem
Definition
Living xylem moves water and nutrients from the roots up to the top of the tree and branches to the leaves also called sapwood.
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