Ecology Midterm Review #1

Front

What do animals obtain nitrogen from to make proteins and DNA?

Back

Animals obtain nitrogen from the proteins and DNA that they consume by eating another organism.

Front

What is photosynthesis?

Back

Photosynthesis is using sunlight, water, and carbon dioxide to make sugars and oxygen.

Front

What is a community in ecology?

Back

A community is made up of groups of different species that live together in a defined area.

Front

What are autotrophs?

Back

Autotrophs are organisms that use energy they take in from the environment to convert inorganic molecules into complex organic molecules.

Front

How much energy does a snake obtain from a mouse in a food chain?

Back

A snake is able to obtain 10% of the energy from the mouse.

Front

What is the role of nitrogen-fixing bacteria in the nitrogen cycle?

Back

Nitrogen-fixing bacteria convert atmospheric nitrogen (N2) into ammonia, which can be used by plants.

Front

What is the primary source of energy for most ecosystems?

Back

The primary source of energy for most ecosystems is sunlight.

Front

What is a food chain?

Back

A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another.

Front

What is the difference between a population and a community?

Back

A population consists of individuals of the same species living in a specific area, while a community includes different species living together.

Front

What is the carbon cycle?

Back

The carbon cycle is the process by which carbon is exchanged among the biosphere, geosphere, hydrosphere, and atmosphere.