Ecology Test

Which of the following is NOT a basic method used by ecologists to study the living world?

To produce food autotrophs capture energy from sunlight or

The simplest grouping of more than one kind of organism in the biosphere is a(n)

Movements of energy & nutrients through living systems are different because

Organisms that obtain nutrients by breaking down dead and decaying plants and animals:

A snake that eats a frog that has eaten an insect that fed on a plant is

What is an organism that feeds only on plants called?

Which of the following organisms does NOT require sunlight to live?

Nitrogen fixation is carried out primarily by

Branch of biology dealing w/ interactions among organisms & between organisms their environment

An organism using energy to produce its own food supply from inorganic compounds is called a(n)

The organisms in the ocean with the smallest total biomass are the most likely

The total amount of living tissue within a given trophic level is called the

What animals eat both producers and consumers?

An organism that cannot make its own food is called a(an)

Scientists classify the nitrogen, carbon, and water cycles as:

Green plants are

What method do ecologists use when they count the population of certain species?

All of the members of a particular species that live in the same area are called a(an)

What is the combined portions of Earth called in which all living things exist?

Planting eating animals such as cows are called

Which of the following descriptions about the organization of an ecosystem is correct?

Only about 10% of the __?__ in a trophic level is available to organisms at the next level.

All the interconnected feeding relationships in an ecosystem make up a food

Living organisms require nitrogen to make_?_, which are used to build proteins.

Water can enter the atmosphere through the process of evaporation and

The repeated movement of water between Earth's surface and the atmosphere is called

The chemical substances that an organism requires to live are called:

which type of pyramid shows the amount of living tissue at each trophic level in an ecosystem?

What is the process by which bacteria convert nitrogen gas in the air to ammonia?

Only 10% of the energy stored in an organism can be passed to the next level, the rest is

What is the original source of almost all the energy in most ecosystems?

Carbon cycles through the biosphere in all ofthe following processes EXCEPT:

Organisms need nutrients in order to

Organisms that break down organic matter and return it to the environment are called

What the steps in movement of energy, an organism's feeding status in an ecosystem?