Ch 3 Ecosystem dynamics

Front

What is nitrogen fixation?

Back

The process of converting atmospheric nitrogen (N2) into a form usable by living organisms, primarily accomplished by bacteria.

Front

Which organisms are primarily responsible for nitrogen fixation?

Back

Bacteria, particularly those in the root nodules of legumes.

Front

What is the role of decomposers in an ecosystem?

Back

Decomposers break down dead organic matter, recycling nutrients back into the soil.

Front

What is an energy pyramid?

Back

A graphical representation of the energy flow in an ecosystem, showing the energy available at each trophic level.

Front

How much energy is typically lost at each trophic level in an energy pyramid?

Back

About 90% of energy is lost as heat or used for survival at each level.

Front

What is the troposphere?

Back

The lowest layer of Earth's atmosphere where weather occurs and where the air we breathe is found.

Front

What is the biosphere?

Back

The global sum of all ecosystems, representing the zone of life on Earth.

Front

What is remote sensing?

Back

The acquisition of information about an object or area from a distance, often using satellite or aerial imagery.

Front

What is a controlled experiment?

Back

An experiment in which all variables are kept constant except for the one being tested.

Front

What is the nitrogen cycle?

Back

The series of processes by which nitrogen and its compounds are interconverted in the environment and in living organisms.