AP Env Sci Unit 1 & 2

Front

What cycle is dependent on bacteria for fixation and denitrification?

Back

Nitrogen Cycle

Front

What is a keystone species?

Back

A species on which other species in an ecosystem largely depend, such that if it were removed the ecosystem would change drastically.

Front

What is nitrogen fixation?

Back

The step in the biogeochemical cycle where nitrogen gas from the atmosphere is converted into ammonia by bacteria that live in the soil and on the roots of plants.

Front

What is the main difference between primary and secondary ecological succession?

Back

Primary succession begins WITHOUT soil; Secondary succession begins WITH soil.

Front

What role does a keystone species play in an ecosystem?

Back

A keystone species helps to hold an ecosystem together.

Front

What is denitrification in the nitrogen cycle?

Back

The process by which bacteria convert nitrates back into nitrogen gas, returning it to the atmosphere.

Front

What are the main components of the nitrogen cycle?

Back

Nitrogen fixation, nitrification, assimilation, ammonification, and denitrification.

Front

Define ecological succession.

Back

The process by which ecosystems change and develop over time.

Front

What is the significance of biodiversity in an ecosystem?

Back

Biodiversity contributes to ecosystem resilience, productivity, and stability.

Front

What is the difference between autotrophs and heterotrophs?

Back

Autotrophs produce their own food (e.g., plants), while heterotrophs consume other organisms for energy.