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1 Cycles of Matter 1 of 33

2 The purpose of this lesson is to learn the water, carbon, nitrogen, and phosphorus cycles. This PowerPoint will provide most of the required information you need to accomplish your task. TAKE NOTES! If you need additional resources, feel free to use the internet. Once you have taken the necessary notes to learn these cycles, I have a 2 nd task for you to complete which is due next week Friday. 2 of 33

3 3-3 Cycles of Matter How does matter move among the living and nonliving parts of an ecosystem? 3 of 33

4 Recycling in the Biosphere Recycling in the Biosphere Energy and matter move through the biosphere very differently. Unlike the one-way flow of energy, matter is recycled within and between ecosystems. 4 of 33

5 Recycling in the Biosphere Elements, chemical compounds, and other forms of matter are passed from one organism to another and from one part of the biosphere to another through biogeochemical cycles. Matter can cycle because biological systems do not use up matter, they transform it. Matter is assembled into living tissue or passed out of the body as waste products. 5 of 33

6 The Water Cycle The Water Cycle All living things require water to survive. Water moves between the ocean, atmosphere, and land. 6 of 33

7 The Water Cycle DRAW THIS CYCLE NO NEED THE PICTURES JUST THE CYCLE Water moves between the ocean, atmosphere, and land. 7 of 33

8 The Water Cycle Water molecules enter the atmosphere as water vapor, a gas, when they evaporate from the ocean or other bodies of water. The process by which water changes from a liquid form to an atmospheric gas is called evaporation. Water can also enter the atmosphere by evaporating from the leaves of plants in the process of transpiration. 8 of 33

9 The Water Cycle Water vapor condenses into tiny droplets that form clouds. The water returns to Earth s surface in the form of precipitation. Water enters streams or seeps into soil where it enters plants through their roots. 9 of 33

10 Nutrient Cycles How are nutrients important in living systems? 10 of 33

11 Nutrient Cycles Nutrient Cycles All the chemical substances that an organism needs to sustain life are its nutrients. Every living organism needs nutrients to build tissues and carry out essential life functions. Similar to water, nutrients are passed between organisms and the environment through biogeochemical cycles. 11 of 33

12 Nutrient Cycles Primary producers, such as plants, or autotrophs, usually obtain nutrients in simple inorganic forms from their environment. Consumers or heterotrophs obtain nutrients by eating other organisms. 12 of 33

13 Nutrient Cycles The Carbon Cycle Carbon is a key ingredient of living tissue. Biological processes, such as photosynthesis, respiration, and decomposition, take up and release carbon and oxygen. Geochemical processes, such as erosion and volcanic activity, release carbon dioxide to the atmosphere and oceans. 13 of 33

14 DRAW THIS CYCLE NO NEED THE PICTURES JUST THE CYCLE Take Note! There is one more example of the carbon cycle on the next page. 14 of 33

15 15 of 33

16 Nutrient Cycles Biogeochemical processes, such as the burial and decomposition of dead organisms and their conversion under pressure into coal and petroleum (fossil fuels), store carbon underground. Human activities, such as mining, cutting and burning forests, and burning fossil fuels, release carbon dioxide into the atmosphere. 16 of 33

17 Nutrient Cycles The Nitrogen Cycle All organisms require nitrogen to make proteins. Although nitrogen gas is the most abundant form of nitrogen on Earth, only certain types of bacteria can use this form directly. Such bacteria live in the soil and on the roots of plants called legumes. They convert nitrogen gas into ammonia in a process known as nitrogen fixation. 17 of 33

18 Nutrient Cycles Other bacteria in the soil convert ammonia into nitrates and nitrites. Once these products are available, producers can use them to make proteins. Consumers then eat the producers and reuse the nitrogen to make their own proteins. 18 of 33

19 DRAW THIS CYCLE NO NEED THE PICTURES JUST THE CYCLE 19 of 33

20 20 of 33

21 Nutrient Cycles N 2 in Atmosphere Synthetic fertilizer manufacturer Decomposition Atmospheric nitrogen fixation Uptake by producers Reuse by consumers Uptake by producers Reuse by consumers Bacterial nitrogen fixation Decomposition excretion NH 3 NO 3 and NO 2 Decomposition excretion 21 of 33

22 Nutrient Cycles When organisms die, decomposers return nitrogen to the soil as ammonia. The ammonia may be taken up again by producers. 22 of 33

23 Nutrient Cycles Other soil bacteria convert nitrates into nitrogen gas in a process called denitrification. This process releases nitrogen into the atmosphere once again. 23 of 33

24 Nutrient Cycles The Phosphorus Cycle Phosphorus is essential to organisms because it helps forms important molecules like DNA and RNA. Most phosphorus exists in the form of inorganic phosphate. Inorganic phosphate is released into the soil and water as sediments wear down. 24 of 33

25 Nutrient Cycles Phosphate, eventually enters the ocean, where it is used by marine organisms. Some phosphate stays on land and cycles between organisms and the soil. Plants bind the phosphates into organic compounds. 25 of 33

26 Nutrient Cycles Organic phosphate moves through the food web and to the rest of the ecosystem. Organisms DRAW THIS CYCLE NO NEED THE PICTURES JUST THE CYCLE Land Ocean Sediments 26 of 33

27 Nutrient Limitation Nutrient Limitation The primary productivity of an ecosystem is the rate at which organic matter is created by producers. One factor that controls the primary productivity of an ecosystem is the amount of available nutrients. 27 of 33

28 Nutrient Limitation If a nutrient is in short supply, it will limit an organism's growth. When an ecosystem is limited by a single nutrient that is scarce or cycles very slowly, this substance is called a limiting nutrient. 28 of 33

29 Nutrient Limitation When an aquatic ecosystem receives a large input of a limiting nutrient such as runoff from heavily fertilized fields the result is often an immediate increase in the amount of algae and other producers. This result is called an algal bloom. Algal blooms can disrupt the equilibrium of an ecosystem. 29 of 33

30 3 3 Transpiration is part of the a. water cycle. b. carbon cycle. c. nitrogen cycle. d. phosphorus cycle. 30 of 33

31 3 3 Carbon is found in the atmosphere in the form of a. carbohydrates. b. carbon dioxide. c. calcium carbonate. d. ammonia. 31 of 33

32 3 3 Biologists describe nutrients as moving through cycles because the substances a. start as simple organic forms that plants need. b. provide building blocks and energy that organisms need. c. are passed between organisms and the environment and then back to organisms. d. are needed by organisms to carry out life processes. 32 of 33

33 3 3 The only organisms that can convert nitrogen in the atmosphere into a form useful to living things are nitrogen-fixing a. plants. b. bacteria. c. detritivores. d. animals. 33 of 33

34 3 3 When an aquatic ecosystem receives a large input of a limiting nutrient, the result is a. runoff. b. algal death. c. algal bloom. d. less primary productivity. 34 of 33

35 2nd Task? Write a story Click on the next 2 slides for samples.

36

37

38 It s your turn! 2 nd Task! Write a story about the nitrogen molecule and his cycle. If it helps, use the diagram below to tell his story. Due next week Friday, 12/6

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