Populations and the Environment Answers

What is a biogeochemical cycle?

The cycle is not a nutrient cycle.

Identify the nutrients described below. A key component in the formation of organic compounds, such as nucleic acids and ATP

Most abundant gas in the atmosphere; plants absorb it from bacteria in the soil

In every living thing; plants utilize it when they perform photosynthesis

A is a chemical substance that organisms require to live.

A serves as a long-term storage area for water or nutrients.

Water changes from a gas to a liquid phase. Water falls to the Earth in the form of a liquid or solid. Liquid water changes into a gas. Water evaporates from the leaves of plants.

Bacteria in the soil converts this nutrient into a usable form. Plants take up the usable nutrient through the soil and assimilate it into proteins, making it part of the plant. An animal eats the plants, and the nutrient becomes part of the animal. When the animal dies, it decomposes, returning the nutrient back to the soil. Which cycle is being described?

Bacteria convert ammonia into nitrates. Bacteria convert nitrates into nitrogen gas. Bacteria convert nitrogen gas into ammonia.

Part of all organic compounds Component of bones and found in cell membranes Important component of proteins, like carbon Universal solvent

Water Carbon Nitrogen Phosphorous

Fossil fuels are normally stored in a reservoir deep in the Earth. The carbon in fossil fuels, including coal and oil, are essentially locked out of the natural carbon cycle due to their location deep in the Earth. Humans have found a way to access and utilize this carbon. Identify a risk for accessing this carbon.

Which of the following is a reservoir for carbon and nitrogen, but not phosphorus?

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