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Ecology the study of interactions between organisms and their environment.
Biotic factors living things in the environment.
Abiotic factors nonliving things in the environment
oganism a single living thing
Population all of the members of one species living together.
Community all the different populations in a specific area(only the LIVING things)
Ecosystem All of the biotic (living) and abiotic (nonliving) things that interact in an environment.
Biome a group of ecosystems with similar climates ,plants and animals.
Biosphere the part of earth where living things survive.(land, water, air)
Why is soil important? because everything that ?lives on land depends directly or ?indirectly on soil.
Soil quality(how good it is) is based on these properties soil profile,composition,texture, and particle size
Soil mixture of rock particles, minerals, decayed organic material(plants,animals), air, and water.
Humus The decayed organic matter in soil
Where does the sand, silt, and clay portion of soil come from ? weathered bedrock
bedrock the solid rock layer beneath the soil.
Soil texture depends on the size of individual soil particles and is determined by how much of each particle makes up the soil.
What is the largest soil particle? sand
What is the smallest soil particle? clay
Soil particles from largest to smallest sand,silt,clay
soil pH ranges from 4-10
best pH for plant growth between 5 and 7
Lime a kind of fertilizer that alters(changes) pH
Soil Profile the layers that make up soil
horizon a soil layer
A" Horizon topsoil,
"B" Horizon subsoil
"C" Horizon parent material above the bedrock.
Topsoil nutrient rich,containing a mixture of humus, clay, and minerals.
Which horizon most suitable for plant growth? A horizon or topsoil
Where do most animals live? A horizon or topsoil
Decomposers organisms such as fungi and bacteria that break down dead plants and animals.
birth rate the number of births in a population during a certain amount of ?time.
What is the main way organisms are added to populations? births
What is the main way populations decrease? deaths
death rate the number of deaths in a population during a certain amount of time
Immigration when organisms move in from another environment.
Emigration when part of the population leaves or exits the ?environment
population density the number of organisms in a given amount of space for a particular area.
limiting factors biotic or abiotic factors that limit the number of individuals.
Examples of limiting factors weather, space,food and water
carrying capacity the maximum number of organisms that can survive in a particular ecosystem.
Created by: science7th



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