Unit #1 Review B

Front

What is a pioneer species?

Back

A species that colonizes an area where no other living organisms exist, initiating a cycle of ecological succession.

Front

What does succession refer to in ecology?

Back

The process of change in the species structure of an ecological community over time.

Front

Define autotroph.

Back

An organism that produces its own food using sunlight or chemical energy; also known as a producer.

Front

Which organisms in a food web contain the lowest concentration of chemical pollutants?

Back

Producers, as they are at the base of the food chain.

Front

In an energy pyramid, which organisms have the most energy available?

Back

Producers, as they convert sunlight into energy through photosynthesis.

Front

What is secondary succession?

Back

The process of ecological change that occurs in an area where a disturbance has destroyed an existing community but left the soil intact.

Front

What is the role of decomposers in an ecosystem?

Back

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

Front

What is the difference between a herbivore and a carnivore?

Back

Herbivores eat plants, while carnivores eat other animals.

Front

What is mutualism?

Back

A symbiotic relationship where both species benefit from the interaction.

Front

Define nitrogen fixation.

Back

The process by which certain bacteria convert atmospheric nitrogen into a form usable by plants.