True/False

Freshwater habitats are independent of terrestrial habitats.

False

True/False

An ecosystem consists of biotic and abiotic factors.

True

True/False

Clearing a forest would reduce the amount of energy available to the consumers.

True

True/False

While an understanding of the interactions between organisms and their environment was very important to early hunter and gatherer humans, it is even more important today because humans are having significant effects on the environment.

True

True/False

Cutting down trees in a forest alters the habitat of the organisms living in the forest.

True

True/False

An organism's niche includes its habitat.

True

Abiotic factors affect an ecosystem by all of these except the

a) quantity and quality of water
b) amount of light available
c) nitrogen-fixing bacteria
d) quantity of minerals

nitrogen-fixing bacteria

The most important single factor affecting the biosphere is

a) solar radiation
b) the biotic community
c) precipitation
d) wind

the biotic community

Which of the following is the smallest ecological unit?

a) a community
b) a biome
c) a population
d) an ecosystem

a population

Collectively, physical factors such as light, temperature, and moisture that affect an organism's life and survival are called the

a) biotic environment
b) abiotic environment
c) ecosystem
d) niche

abiotic environment

The rate of photosynthesis carried on by plants living in a body of water depends upon the

a) oxygen content of the water
b) nitrogen content of the water
c) amount of light that penetrates the water
d) elevation of the body of water

amount of light that penetrates the water

Which of the following would not be included in a description of an organism's niche?

a) its trophic level
b) the humidity it prefers
c) its number of chromosomes
d) when it reproduces

its number of chromosomes

Ecology is the study of the interaction of living organisms

a) with each other and their habitat
b) and their communities
c) with each other and their physical environment
d) and the food they eat

with each other and their physical environment

The destruction of the ozone layer may be responsible for an increase in

a) cataracts
b) melanoma
c) cancer of the retina
d) all of the above

all of the above

Ozone in the atmosphere

a) leads to formation of acid precipitation
b) combines readily with water vapor
c) absorbs harmful radiation from the sun
d) all of the above

absorbs harmful radiation from the sun

Ecological models are useful for

a) making predictions about future ecological changes
b) testing predictions about future ecological changes
c) evaluating proposed solutions to environmental problems
d) all of the above

all of the above

The physical location of an ecosystem in which a given species lives is called a

a) habitat
b) tropical level
c) community
d) food zone

habitat

Which of the following is not an adaptation for avoiding unfavorable conditions?

a) acclimation
b) body temperature regulation
c) dormancy
d) migration

body temperature regulation

Which of the following would not be included in a description of an organism's niche?

a) its trophic level
b) the humidity and temperature it prefers
c) its number of chromosomes
d) when it produces

its number of chromosom