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42 terms

7th grade Science Chapter 18

7th Holt Life Science Chapter 18 Interaction of Living Things
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abiotic factors
water, sunlight, temperature, soil and air. these are non living things
biotic factors
organisms depend on other organisms for food, shelter, protection, and reproduction. These are the living things.
all the mallard ducks living on a lake at the same time make up a ______________.
population
A population of squirrels and all the populations they interact with make up a _____________.
community
A coral reef is an example of an ____________.
ecosystem
Scientists call tropical rain forests and mountains ____________________.
biomes
Biomes, communities, and populations are part of the _________________.
biosphere
The number of individual organisms that occupy a definite area is called population ______________.
density
If the amount of food in an area can support only a certain number of deer in a population, the amount of food is called a ____________________.
limiting factor
A relationship that benefits one organism without affecting the other is called ____________________.
commensalism
A relationship that benefits both organisms is called ___________________.
mutualism
The pond a frog lives in is called its ______________.
habitat
symbiosis
any close interaction between two or more different species
ecology
study of the enteractions among organisms and their environment
community
populations of different species that interact in some way'abiotic
population
all the members of one species that live in the same place at the same time
abiotic factors
factors that are the nonliving parts of the environment
food chain
way of showing how energy in the form of food passes from one organism to another
niche
role of an organism in the ecosystem
biotic factors
factors that are the living parts of the environment
biosphere
part of Earth that supports life
ecosystem
all communities in an area and the abiotic factors that affect them
habitat
where an organism lives
population density
number of individuals in a population that occupy a definite area
limiting factor'
factor that affects the number of individuals in a population
At each level of a food chain, organisms lose energy as _______.
heat
Energy is renewed constantly by _____________.
sunlight
The law of conservation of mass states that ______________ is never lost or gained.
energy
Plants are ________________. they capture and use energy from the Sun and use it to produce carbohydrates
producers
Animals are _____________. they obtain energy when they feed on producers or other animals.
consumers
Mushrooms are _____________; they obtain energy as they break down the remains of organisms.
decomposers
This movement of energy through a community is known as a _______________.
food chain
When food chains comine with other food chains, they form a _______________.
food web
Biosphere
this includes Earth's crust, water on Earth's surface and atmosphere
paraticism
a relationship in which one species benefits at the expense of another
niche
role of an organism in an ecosystem
What has happened to energy in the environment?
recycles
The levels of organization from thelowest level to the highest:
1. organism 2. population 3. community 4.ecosystem 5. biome 6. biosphere
Groups of populations that interact with each other in a given area form a ______________.
community
The struggle among organisms to obtain resources for reproduction and survival is called __________________.
competition
A symbiotic relationship that benefits both species is called
mutualism
The physical location where an organism lives is its _____________.
habitat