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45 Cards in this Set

  • Front
  • Back
all the living things and nonliving things in a given area
biotic factors
the living things in an ecosystem
Abiotic factors
the nonliving things in an ecosystem
average weather conditions in an area over time
List the nonliving parts of an ecosystem
Sun, Climate, Temperature, Water, Atmosphere, Soil
the layer of gases that surrounds Earth
List two abiotic factors affected by the sun
climate and temperature
What percent of the earth's surface is covered by water?
about 70%
What are the three processes involved in the water cycle?
evaportation, condensation, and precipitation
the process during which liquid water changes into a gas called water vapor
What three factors affect how quickly water evaporates?
temperature, humidity and wind
the release of water vapor from the leaves and stems of plants
Water is a by-product of the process that releases energy in cells, what is that process?
Cellular respiration
the process during which water vapor changes into liquid water
water that falls from clouds to Earth's surface
List forms of precipitation
rain, snow, sleet or hail
Why is nitrogen so important to living things?
It is essential to proteins and an important part of DNA
nitrogen fixation
the process that changes atmospheric nitrogen into nitrogen compounds that are usable by living things
What are two ways nitrogen returns to the enviroment from organisms?
bacteria decomposing dead organisms, waste products
What atmospheric activity converts nitrogen gas to nitrogen compounds?
What is the primary source of oxygen in the Earth's atmosphere?
Humans take in ______________ and release ___________ ___________.
Oxygen, carbon dioxide
List 4 compounds in the human body that contain carbon.
proteins, sugars, fats, DNA
What conditions were necessary for the formation of fossil fuels?
pressure, high temperatures, and bacteria
Where do organisms get their carbon from?
food, atmosphere, or bodies of water
What form does carbon take in the atmosphere?
carbon dioxide
What do photosynthetic organisms produce using carbon dioxide and water?
Energy-rich sugars
What are the by-products of energy releasing cellular respiration?
Carbon dioxide and water
greenhouse effect
gases in the atmosphere that absorb thermal energy from the Sun and keeps Earth warm
The main source of energy for most life on earth.
Energy cannot be created or destroyed, but can change form
law of conservation of energy
Does energy flow in cycles like matter or in only one direction?
energy flows in only one direction
a series of chemical reactions that convert light energy, water and carbon dioxideinto the food-energy molecule glucose and give off oxygen
the process during which producers use chemical energy in matter rather than light energy and make food
make their own food through photosynthesis or chemosynthesis
get the energy they need to survive by consuming other organisms
feed only on producers
eat other animals
eat both producers and other consumers
eat the remains of other organisms
food chain
a model that shows how energy flows in an ecosystem through feeding relationships
food web
a model of energy transfer that shows how food chains in a community are interconnected
energy pyramid
shows the amount of energy available in each step of a food chain
trophic level
the steps of a energy pyramid
What percentage of energy is transferred from one trophic level to the next level?
About 10%