The Carbon Cycle. Goal Use this page to review the carbon cycle. CHAPTER 2 BLM 1-19 DATE: NAME: CLASS:

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1 CHAPTER 2 BLM 1-19 The Carbon Cycle Goal Use this page to review the carbon cycle.

2 CHAPTER 2 BLM 1-20 The Carbon Cycle Concept Map Goal Use this page to make a concept map about the carbon cycle. What to Do Use the following terms to construct a concept map that provides meaningful information about the carbon cycle. algae cellular respiration long-term stores photosynthesis trees atmosphere coal deposits ocean sedimentation volcanic eruption calcium carbonate decaying matter oil and gas short-term stores

3 CHAPTER 2 BLM 1-21 The Nitrogen Cycle Goal Use this diagram to review the nitrogen cycle.

4 CHAPTER 2 Questions about the Nitrogen BLM 1-22 Cycle Goal Use this page to record information about the nitrogen cycle. What to Do Read the following questions. Complete the answers as you read pages in your student book. Why is nitrogen necessary for living organisms? Points to Know How is nitrogen stored? How is nitrogen cycled through the ecosystem? What is nitrogen fixation? What is nitrification and uptake? How does nitrogen return to the atmosphere? How is excess nitrogen removed from ecosystems? How do human activities affect the ecosystem?

5 CHAPTER 2 BLM 1-23 Know Your Nitrogen Goal Use this page to learn terms about nitrogen. What to Do Cut out the terms on the left, pair each with the correct definition on the right, and paste them together on another sheet. Or make flash cards by pasting the definition to the back of the term. Terms Definitions Nitrogen fixation The process of making nitrates Denitrification Provide nitrogen for the host plant and in return obtain sugars Nitrifying bacteria Certain bacteria that convert nitrate back into nitrogen gas Nitrate NO 2 Nitrogen uptake Nitrification Nitrogen gas is converted into nitrate using electrical energy from lightning. The process where nitrates are converted into nitrogen gas Ammonium N 2 Denitrifying bacteria The process where nitrates enter plant roots Nitrite NH 4 + Nitrogen-fixing bacteria Certain bacteria that convert ammonium into nitrite or nitrite into nitrate Nitrogen NO 3

6 CHAPTER 2 BLM 1-24 The Phosphorus Cycle Goal Use this diagram to help you study the phosphorus cycle.

7 CHAPTER 2 BLM 1-25 Nutrients True or False Goal Use this page to check your understanding of nutrients. Beside each statement below, write the letter T if you think the statement is true or F if you think it is false. If you think the statement is false, write the correct sentence in the space provided. 1. Green plants add carbon dioxide to our atmosphere through a process of photosynthesis. 2. Decomposers are a very important part of every nutrient cycle. 3. Green plants occupy the second trophic level in food chains. 4. There is a loss of energy at each trophic level. 5. Carrying capacity is the largest number of organisms that can survive in an area. 6. In a food chain, a deer feeding off leaves would be a secondary consumer. 7. Carnivores are organisms that eat plant material. 8. The process of nitrogen fixation uses oxygen to produce carbon dioxide. 9. While a pyramid of numbers or biomass can be inverted, a pyramid of energy cannot.