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1 of 46© Boardworks Ltd 2007
2 of 46© Boardworks Ltd 2007 Throughout an ecosystem, energy is constantly lost by wasted heat. In contrast, nutrients are constantly recycled through the carbon cycle and the nitrogen cycle. What happens to nutrients? microbial decomposition of dead organisms and waste nutrients in the soil and atmosphere energy and biomass
3 of 46© Boardworks Ltd 2007 What is decay? In all ecosystems, dead organisms and waste material are broken down by bacteria and fungi called decomposers. Under what conditions will decay occur the fastest? A warm, moist, oxygen-rich environment is the most favourable for decay to occur. Some food chains have decaying matter as the first stage. This process is decay or decomposition, and it releases nutrients back into the environment ready to be reused by other organisms.
4 of 46© Boardworks Ltd 2007 How do humans use micro-organisms? Micro-organisms are used in sewage plants to break down human waste. Decomposers break down plant waste to make compost. The average person in the UK creates just over half a tonne of waste a year. How are micro-organisms used to break some of this down? Biodegradable plastics are broken down by micro-organisms.
5 of 46© Boardworks Ltd 2007 Why is nitrogen so important? Nitrogen is essential for growth because it is used by plants and animals to make proteins. Nitrogen makes up about 78% of the atmosphere. However, nitrogen deficiency is the most common cause of poor plant growth. How is atmospheric nitrogen changed into a useable form? Why are plants unable to use the nitrogen straight from the air? Nitrogen gas (N 2 ) is unreactive and is not easily converted into other compounds. Most plants can only take up nitrogen in the form of ammonia or nitrate.
6 of 46© Boardworks Ltd 2007 What is the nitrogen cycle?
7 of 46© Boardworks Ltd 2007 Labelling the nitrogen cycle
8 of 46© Boardworks Ltd 2007 Components of the nitrogen cycle
9 of 46© Boardworks Ltd 2007 Nitrates are important because they are a form of nitrogen that plants can absorb. Nitrogen is used to make protein, and is passed from plants to animals along food chains. How are nitrates produced? Some nitrogen compounds form during lightning strikes and are washed into the soil by rain water. Lightning provides the high level of energy required for nitrogen to react and form compounds. Decomposers release ammonium compounds from waste (such as urine) and dead matter. Nitrifying bacteria then convert the ammonium compounds into nitrates. What processes add nitrates to the soil?
10 of 46© Boardworks Ltd 2007 This rugged place is in Iceland. Deforestation by the original settlers and high levels of volcanic activity have left much of the country as bare lava or sand; an environment in which few plants grow. In the 1960s, the country began to manage its soil, and dropped millions of lupin seeds from the air. Can plants add nitrogen to the soil? Why might lupins survive where nothing else grows?
11 of 46© Boardworks Ltd 2007 Most plants need nitrates from the soil because the nitrogen in air is too unreactive. These plants rely on the presence of nitrifying bacteria in the soil or artificial fertilizers. Nitrogen-fixing bacteria living in the root nodules of legumes convert nitrogen gas into nitrates, improving the fertility of poor-quality soils. What are legumes? By contrast, lupins and other legumes, such as clover and peas, are self-sufficient.
12 of 46© Boardworks Ltd 2007 Nitrates are vital for plant growth, but levels in the soil are gradually depleted as crops grow. How can nitrates be added to soil? Modern, intensive farming uses artificial fertilizers. These are made by the Haber process. However, run-off into nearby rivers and lakes can cause eutrophication. Organic farming uses manure – a natural fertilizer. Crop rotation, a system that varies the crops planted each season, is also used to maintain soil fertility. What methods can farmers use to increase soil nitrate levels?
13 of 46© Boardworks Ltd 2007 Keeping soil fertile
14 of 46© Boardworks Ltd 2007 Why is carbon important? Proteins, fats and sugar all contain carbon. Life without carbon would be very different and might be impossible. Carbon is present in the atmosphere as carbon dioxide. What happens to the carbon in organisms when they die? The carbon from dead organisms can also form fossil fuels and sedimentary rocks such as limestone. These are long-term carbon stores. As dead matter decomposes, carbon is released back into the atmosphere in the form of carbon dioxide. Plants use carbon dioxide during photosynthesis to produce sugars. The carbon is then transferred to animals along food chains.
15 of 46© Boardworks Ltd 2007 What is the carbon cycle?
16 of 46© Boardworks Ltd 2007 Labelling the carbon cycle
17 of 46© Boardworks Ltd 2007 How is carbon recycled? How are carbon dioxide levels changing in the atmosphere of the Earth? Carbon is constantly recycled by photosynthesis and respiration. biomass + oxygen algae respiration shrimp respiration photosynthesis feeding carbon dioxide + water In a sealed ecosphere, carbon dioxide concentrations fluctuate but the mean level does not change.
18 of 46© Boardworks Ltd 2007 Although the total amount of carbon in the environment is fixed, carbon dioxide levels are constantly fluctuating. Are carbon dioxide levels rising? Currently, the general trend shows an increasing level of carbon dioxide. Why might this be happening? year 0 400 200019601980 300 200 100 CO 2 conc. (ppm) Many scientists believe that human activity, such as burning fossil fuels and making cement from limestone, is responsible for increasing carbon dioxide levels. What environmental problems might this cause?
19 of 46© Boardworks Ltd 2007 Carbon: true or false?
20 of 46© Boardworks Ltd 2007 Glossary (1/2) carbon cycle – The process by which carbon is continuously recycled in the environment. denitrifying bacteria – Soil bacteria that convert nitrates into nitrogen gas. fertilizer – A chemical added to soil to provide essential mineral salts supporting plant growth.
21 of 46© Boardworks Ltd 2007 Glossary (2/2) legume – A group of plant species that contain nitrogen- fixing bacteria in their roots and can therefore make their own nitrates. nitrifying bacteria – Soil bacteria that convert ammonium ions from protein decomposition into nitrates. nitrogen cycle – The process by which nitrogen is continuously recycled in the environment. nitrogen-fixing bacteria – Bacteria that live in the roots of legumes and convert nitrogen gas into nitrates.
1 of 10© Boardworks Ltd of 10© Boardworks Ltd 2009 Why is nitrogen so important? Nitrogen is essential for growth because it is used by plants.
Carbon and Nitrogen Cycles. 2 of 46© Boardworks Ltd 2007.
1 of 46© Boardworks Ltd of 46© Boardworks Ltd 2007.
Recycling The Nitrogen Cycle. Starter Look around the lab, which materials will rot or decay in a few years given the right conditions?
Nitrogen Cycle! Why is nitrogen important? It is found in two major macromolecules including nucleic acids such as DNA and proteins.
1 of 7© Boardworks Ltd of 7© Boardworks Ltd 2009 Nutrient Cycles 1.On your doodle sheet part A, describe the water cycle, carbon cycle and nitrogen.
Learning objectives Success criteria Decomposition and the nitrogen cycle Describe the role of decomposers in the decomposition of organic material Describe.
How Ecosystems WorkSection 2 Section 2: The Cycling of Matter Preview Classroom Catalyst Objectives The Carbon Cycle How Humans Affect the Carbon Cycle.
How Ecosystems WorkSection 2 Section 2: The Cycling of Matter Preview The Carbon Cycle How Humans Affect the Carbon Cycle The Nitrogen Cycle Decomposers.
Chapter 5 Section 2 The Cycling of Materials. Objectives List the three stages of the carbon cycle. Describe where fossil fuels are located. Identify.
The Nitrogen Cycle Science 10 “Old Outcomes”. The Importance of Nitrogen Nitrogen is a main ingredient in fertilizer. Why does fertilizer produce better.
How Ecosystems WorkSection 2 The Carbon Cycle The carbon cycle is the movement of carbon from the nonliving environment into living things and back Carbon.
IGCSE BIOLOGY SECTION 4 LESSON 3. Content Section 4 Ecology and the Environment a)The organism in the environment b)Feeding relationships c)Cycles within.
The carbon cycle is the movement of carbon from the nonliving environment into living things and back ◦ Carbon is the essential component of proteins,
How Ecosystems WorkSection 2 Section 2: The Cycling of Materials Preview Bellringer Objectives The Carbon Cycle How Humans Affect the Carbon Cycle The.
DAY 1 Chapter 5 How Ecosystems Work Section 2: Cycling of Materials.
1.4.8 Nutrient Recycling. 2 Nutrient Recycling (1/3) There is a limited amount of nutrients on earth e.g. you are probably aware of the water cycle –
1.4.8 Nutrient Recycling. 2 Need to know Define the term: nutrient recycling by organisms. 1.Outline and draw the Carbon Cycle. 2.Outline and draw the.
part of Earth where life exists located near Earth’s surface where sunlight available plants need sunlight to produce food - almost every other.
NUTRIENT CYCLES. What are nutrients? Nutrients are chemicals that are essential to the survival of living things Nutrients are CYCLED through ecosystems.
Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 2 The Cycling of Materials Objectives List the three stages.
AP Biology Ecosystems Ecology Part 2. I. Biogeochemical Cycles (“Bio” means “life”; “geo” means “earth”) These refer to the cycling of matter. A. Water.
How Ecosystems WorkSection 2 DAY 1 Chapter 5 How Ecosystems Work Section 2: Cycling of Materials.
Nitrogen Cycle Importance of Nitrogen Take a deep breath. Most of what you just inhaled is nitrogen. In fact, 80% of the air in our atmosphere is made.
Cycles in an Ecosystem Water, Carbon, and Nitrogen.
Cycling of Matter Carbon Cycle Nitrogen Cycle. Ecosystems TEKS TEK 7.5 B – Demonstrate and explain the cycling of matter within living systems such as.
Problems and profit with waste Lesson 2 Micro-organisms and decay.
Matter is not created or destroyed Law of Conservation of Matter.
Where Nitrogen is Stored Large Stores In the atmosphere where it exists as a gas (78%) Oceans and within organic matter in soil Small Stores Within terrestrial.
Nutrient Cycles Nitrogen and Phosphorus. WHY DO WE NEED NITROGEN?? – Nitrogen is needed to make up DNA and protein! In animals, proteins are vital for.
Chapter 5 Notes Environmental Science. Objectives Describe the short-term and long-term process of the carbon cycle. Identify one way that humans.
The Nitrogen Cycle The basics….. Essential Question: How does the addition of fertilizer impact the both soil and water quality? Warmup- Porosity and.
The Carbon Cycle. Why is Carbon important? All living things are made of carbon!!! Calcium carbonate (CaCO 3 ) makes up animal skeletons Carbon Dioxide.
Movement of energy and matter in ecosystems CHAPTER 21.
Biogeochemical Cycles. What is ecology? The scientific study of interactions among organisms and between organisms and their environment is ecology.
Biogeochemical Cycles CP Environmental Science. Biogeochemical Cycles The chemical interactions that exist between the atmosphere, hydrosphere, geosphere,
The Cycling of Materials Describe the short term and long term process of the carbon cycle. Identify one way that humans are affecting the nitrogen cycle.
The Nitrogen Cycle The basics….. Essential Question How does the addition of fertilizer impact the both soil and water quality? What is Nitrogen? What.
THE CARBON AND NITROGEN CYCLES Cycles of Life. The Carbon Cycle Carbon is found in four major reserves on earth. Organisms: Inside the body tissues of.
Nitrogen Cycle Chapter 3 Section 3.4 continued. Nitrogen Cycle 1. Living things require nitrogen to make amino acids, which are used to build proteins.
Living thing require nutrient cycles ( nitrogen cycle) because - Some organism ( decomposers) obtain energy from the break down of dead bodies and waste.
Review Carbon Cycle Nitrogen Cycle Phosphorus Cycle.
run-off absorption decomposition Cycling of Matter transpiration The water cycle.
1) What are biogeochemical cycles and examples of them on Earth? 2) Why are they important? 3) How do you interpret models of biogeochemical cycles?
The Water Cycle. Water The total amount of water on earth doesn’t change. The total amount of water on earth doesn’t change. Water in Earth’s oceans does.
The Cycles of Matter Why and how is matter recycled in our ecosystem?
Circulation of Nutrients Environmental Biology Unit 2 Advanced Higher Biology.
Cycling of Matter Energy for life flows in one way – from the source (sun or chemical)
Organisms are mainly composed of C, H, O & N Living organisms also contain S and P as well as several other elements These elements compose the macromolecules.
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