Review and Cycles

Cycling of Matter

Lesson 3

Focus Question

How does matter flow through an ecosystem?

What kinds of cycles did we learn about last week?

What’s an example of a cycle in the trophic pyramid we learned about?

New Vocabulary

biogeochemical cycle

denitrification

matter

nitrogen fixation

nutrient

Review Vocabulary

cycle: a series of events that occur in a regular repeating pattern

Cycles in the Biosphere

• Natural processes cycle matter and nutrients through the biosphere.

• Matter is anything that takes up space and has mass

• A nutrient is a chemical substance that an

organism needs to obtain from its environment in order to survive.

Cycles in the Biosphere

• The cycling of nutrients through the

biosphere involves both living organisms
and physical processes.

• The exchange of matter through the

biosphere is called the biogeochemical
cycle.

Cycles in the Biosphere

The Water Cycle
• Water evaporates from bodies of water,

soil, and organisms.

• Water returns from the atmosphere in the form of precipitation

Cycles in the Biosphere

Cycles in the Biosphere

The Carbon and Oxygen Cycles
• Carbon and oxygen recycle relatively quickly

through living organisms.

• Photosynthesis and cellular respiration are important components of these cycles

• Carbon and oxygen enter a long-term cycle when they combines to form calcium carbonate

Cycles in the Biosphere

Cycles in the Biosphere

The Nitrogen Cycle
• The capture and conversion of nitrogen into a form that is useable by plants

• Nitrogen is fixed by bacteria or by electrical storms

• Nitrogen returns to the atmosphere through denitrification, a process in which bacteria convert fixed nitrogen back into nitrogen gas.

Cycles in the Biosphere

Cycles in the Biosphere

The Phosphorus Cycle
• Phosphorus is essential for the growth and development of organisms

• Phosphorus cycles quickly as phosphates through sediments, plants, and consumers

• In addition, phosphorus is weathered or eroded from rocks and added to the cycle.

Cycles in the Biosphere

Review/Quizzes

We have a big test from the district on Monday 10/7. These test scores will be compared to every school in Tulsa Public Schools. We will be reviewing and preparing for this test all week. If we do well, all classes will get a reward! No projects this week. Makeup work can be done in your free time. No makeup work from before Friday will be accepted after this week ends.