Ecology is the study of the interactions between which two parts of the ecosystem?
plants and animals
organisms and abiotic factors
bacteria and soil
biotic factors and organisms
biotic factors and abiotic factors.
Ecology is the study of the interactions between which two parts of the ecosystem?
a. plants and animals
b. organisms and abiotic factors
c. bacteria and soil
d. biotic factors and organisms
b. organisms and abiotic factors.
The nonliving parts of an ecosystem are called _____ factors.
population
dead
abiotic
biotic
abiotic.
A limiting factor _____.
is an influence that can limit a population’s size
impacts animals but not plants
affects all populations in an area similarly
is the same as the carrying capacity
is an influence that can limit a population’s size.
Counting the number of organisms in a small area and multiplying to estimate the number in a larger area is called _____.
direct observation
mark and recapture
indirect observation
sampling
sampling.
What is an approximation of a number, based on reasonable assumptions?
an estimate
a limiting factor
a biotic factor
immigration
an estimate.
What is the largest number (of a single species) a specific area can support?
population
unlimited factor
carrying capacity
niche
carrying capacity.
Counting the number of hoofprints around a water hole to determine the size of a population of deer is an example of _____.
direct observation
indirect observation
sampling
mark and recapture
indirect observation.
What happens to the population size when the birthrate is greater than the death rate?
The population decreases slowly.
The population decreases rapidly.
The population increases.
The population stays the same.
The population increases.
Why does the population size stay close to the carrying capacity?
due to limiting factors
as a result of its niche
because of the growth rate
because of the death rate
due to limiting factors.
The largest population that an environment can support is called its _____.
birth capacity
carrying capacity
death factor
limiting factor
carrying capacity.
How is the carrying capacity related to the limiting factors of a population?
The limiting factors determine the carrying capacity.
The carrying capacity determines the limiting factors.
The carrying capacity and limiting factors are the same thing.
The limiting factors are unrelated to the carrying capacity.
The limiting factors determine the carrying capacity.
Which is true about a species?
They do not interact with members of other species.
They are found within the same ecosystem.
The members can mate with one another and produce fertile offspring.
The members are one of the abiotic factors in the ecosystem.
The members can mate with one another and produce fertile offspring.
In a rainforest, the plants are very crowded and compete for any available sunlight. Which of the following is a limiting factor in this situation?
water
space
soil
shade
shade.
The living parts of an ecosystem are called _____ factors.
habitat
abiotic
biotic
vital
biotic.
If you count 20 beetles in a garden measuring 5 square meters, the population density of the beetles is _____ per square meter.
4 beetles
20 beetles
5 beetles
100 beetles
4 beetles.
.
Which of the following keeps the size of a population of mice at or below its carrying capacity?
increasing birthrate
lack of sunlight
limiting factors
limited factors
limiting factors.
What happens to a population when living conditions in an area are good?
The population will grow larger than the carrying capacity.
The density of the population will increase to the carrying capacity.
The population will grow in size until it reaches the carrying capacity.
The population will change the limiting factors that influence its growth.
The population will grow in size until it reaches the carrying capacity.
The smallest unit of ecological organization is a single _____.
population
ecosystem
community
organism
organism.
What can happen due to competition within a population?
decreased death rate
increased birthrate
variation in climate
fighting over food
fighting over food.
All of the members of a single species in one place is called _____.
a community
a population
an ecosystem
a family
a population.
What forms an ecosystem?
all the living organisms in the area
the communities and the abiotic factors
a population and the abiotic factors
the species and the biotic factors
the communities and the abiotic factors.
Which process requires carbon dioxide, sunlight, and water to produce food?
respiration
photosynthesis
decomposition
precipitation
photosynthesis.
The niche of an organism includes _____.
how and what an organism eats, how an organism reproduces, and how long an organism lives
how and what an organisms eats and how long the organism lives
how an organism reproduces and what eats an organism
how and what an organism eats, what eats an organism, and how an organism reproduces