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Page 1: Energy Flow in Ecosystems. All Organisms Need Energy To Survive! Some organisms get energy by making it themselves These organisms are called autotrophs

Energy Energy Flow in Flow in

EcosysteEcosystemsms

Page 2: Energy Flow in Ecosystems. All Organisms Need Energy To Survive! Some organisms get energy by making it themselves These organisms are called autotrophs

All Organisms Need Energy To Survive!

• Some organisms get energy by making it themselves

• These organisms are called autotrophs

Page 3: Energy Flow in Ecosystems. All Organisms Need Energy To Survive! Some organisms get energy by making it themselves These organisms are called autotrophs

All Organisms Need Energy To Survive!

• Some organisms get energy from other organisms

• These organisms are called heterotrophs

Page 4: Energy Flow in Ecosystems. All Organisms Need Energy To Survive! Some organisms get energy by making it themselves These organisms are called autotrophs

Autotrophs• Another word for autotroph is producer

• Examples of autotrophs include grass, algae and trees

• Autotrophs make their own energy (food) by using the sun’s energy to convert water and carbon dioxide into a form of food that they can use called glucose

• This process is called photosynthesis

Page 5: Energy Flow in Ecosystems. All Organisms Need Energy To Survive! Some organisms get energy by making it themselves These organisms are called autotrophs

What Happens to all the Energy Made by Autotrophs/Producers?

• They use most of it to carry out their functions (growing, reproducing, etc.)

• Some of it is lost in the atmosphere as heat

• Only 10% of the energy is available for the organisms that eat them

Page 6: Energy Flow in Ecosystems. All Organisms Need Energy To Survive! Some organisms get energy by making it themselves These organisms are called autotrophs

Heterotrophs• Another word for heterotroph is consumer

• Examples of heterotrophs include dogs, fish, elephants, and mushrooms

• Heterotrophs get their energy by consuming/eating other organisms

• There are many different types of heterotrophs/consumers…

Page 7: Energy Flow in Ecosystems. All Organisms Need Energy To Survive! Some organisms get energy by making it themselves These organisms are called autotrophs

Heterotrophs• Primary Consumers only eat plants

(herbivores)

• Secondary Consumers eat primary consumers (carnivores/omnivores)

• Tertiary Consumers eat secondary consumers (carnivores/omnivores)

• Scavengers feed off of dead consumers

• Decomposers feed by breaking down organic matter from dead organisms

Page 8: Energy Flow in Ecosystems. All Organisms Need Energy To Survive! Some organisms get energy by making it themselves These organisms are called autotrophs

What Happens to all the Energy Consumed by Heterotrophs?

• They use most of it to carry out their functions (growing, reproducing, etc.)

• Some of it is lost in the atmosphere as heat

• Only 10% of the energy is available for the organisms that eats them

Page 9: Energy Flow in Ecosystems. All Organisms Need Energy To Survive! Some organisms get energy by making it themselves These organisms are called autotrophs

Food Chains• Food chains show the transfer of energy

from the sun to producer to consumer

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• Arrows point in the direction that the energy is going

Page 10: Energy Flow in Ecosystems. All Organisms Need Energy To Survive! Some organisms get energy by making it themselves These organisms are called autotrophs

Food Webs

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• Very rarely in nature is the transfer of energy in an ecosystem as simple as a single food chain

• Food webs are interconnected food chains that show feeding relationships of many organisms in an ecosystem

Page 11: Energy Flow in Ecosystems. All Organisms Need Energy To Survive! Some organisms get energy by making it themselves These organisms are called autotrophs

Food Webs

11

Page 12: Energy Flow in Ecosystems. All Organisms Need Energy To Survive! Some organisms get energy by making it themselves These organisms are called autotrophs

Energy Pyramids• An energy pyramid is yet another way of

showing the transfer of energy in an ecosystem

• Each level is called a trophic level

• They also show– How amount of available energy decreases for

higher consumers– That it takes a large number of producers to

support a small number of tertiary consumers

Page 13: Energy Flow in Ecosystems. All Organisms Need Energy To Survive! Some organisms get energy by making it themselves These organisms are called autotrophs

Energy Pyramids


Energy-ability to do work Autotrophs-organisms able to capture energy from sunlight and produce their own food (producer) Heterotrophs-organisms

Nutrition and Energy Flow What eats what?. How organisms get energy Autotrophs make their own nutrients Autotrophs make their own nutrients Plants use

Photosynthesis Chapter 8. Autotrophs vs. Heterotrophs Autotrophs: Plants and some other types of organisms that use light energy from SUNLIGHT to

AUTOTROPHS All organisms require a source of energy. There are two types of autotrophs: 1. Chemoautotrophs (or chemotrophic autotroph), 2. Photoautotrophs

PHOTOSYNTHESIS Autotrophs: Plants and plant-like organisms make their energy (glucose) from sunlight or chemical bonds Phototroph - use light as an energy

PHOTOSYNTHESIS CAPTURING ENERGY Chapter 6. ENERGY Autotrophs – Organisms that make their own food from inorganic substances and energy (ATP). –Use photosynthesis

Autotrophs vs Heterotrophs. Autotrophs A groups of organisms that can use the energy in sunlight to convert water and carbon dioxide into Glucose (food)

Autotrophs Organisms capture and store free energy for use in biological processes

Cellular Metabolism. Autotrophs and Heterotrophs Autotrophs are organisms that make their own glucose. How Organisms Obtain Energy Heterotrophs are

Chapter 8 Notes. Energy Flows Between Living Things Photosynthesis- process by which light energy is converted to chemical energy. Autotrophs-organisms

- energy flows through - matter recycles Producers = Autotrophs - organisms which can make their food - plants, algae, some bacteria - most use photosynthesis

Photosynthesis and Respiration The Basics. How do organisms obtain energy? Plants get their energy from the sun! Plants are called autotrophs Auto = Self

Autotrophs/Producers A groups of organisms that can use the energy in sunlight to convert water and carbon dioxide into Glucose (food) Autotrophs are

Energy in a Cell The Need for Energy. Cell Energy Autotrophs – make their own food Heterotrophs must get energy from consuming other organisms

Autotrophs= producers: organisms that use photosynthesis to make food Heterotrophs= consumers: organisms that must eat other organisms to get their energy

Photosynthesis. Autotrophs vs. Heterotrophs Autotrophs Organisms that use the sun’s energy to make their own food Plants Some bacteria Heterotrophs Organisms

Chemical Energy and ATP Section 4-1. Organisms are classified according to their energy usage: Autotrophs – make their own food. Ex. Plants & algae

Harvesting Chemical Energy So we see how energy enters food chains (via autotrophs) we can look at how organisms use that energy to fuel their bodies

Cellular Respiration. Autotrophs Autotrophs are organisms that can use basic energy sources (i.e. sunlight) to make energy containing organic molecules

Chapter 6 Energy and Nutrient Relations Trophic types of organisms Autotrophs: photosynthetic chemosynthetic Heterotrophs: organisms live on organic

Chapter 7 Nutrients and Energy. Energy Sources Organisms can be classified by trophic levels. –Autotrophs use inorganic sources of carbon and energy

Nutrient & Energy Flow 2.2. I. Producers vs. Consumers A. Producers / Autotrophs- Organisms that can make their own food/sugars. 1. Plants are autotrophs

Biology The Working Cell: Energy From Food. Sunlight Powers Life There are 2 main types of organisms: 1. Autotrophs are organisms that make their own

Photosynthesis. Energy and Life Plants and some other types of organisms are able to use light energy from the sun to produce food. Autotrophs: organisms

Chapter 8 Photosynthesis. I./2. Some organisms are producers and others are consumers. a)Autotrophs a)Autotrophs make their own energy from inorganic

Organisms must be able to transform energy from one form to another. ◦ Autotrophs —can transform energy from sunlight into chemical energy (can make

CHAPTER 8 PHOTOSYNTHESIS. ENERGY AND LIFE Living things depend on energy Sun is source of most energy 2 types of organisms, – AUTOTROPHS make their own

Food Chains Food Webs Energy Pyramids. Autotrophs: Organism that makes own food Heterotrophs: Organism that consumes other organisms

1 Energy and Nutrient Relations Chapter 6. 2 Energy Sources Organisms can be classified by trophic levels. Autotrophs use inorganic sources of carbon

Photosynthesis & Cellular Respiration Review. 1) What are autotrophs? 1.Organisms that consume their food. 2.Organisms that decompose other organisms

Ch. 10 part 1 The light reaction. I. Autotrophs- Organisms that make their own food (convert light energy to chemical energy) I. Autotrophs- Organisms

What are autotrophs?. Organisms that make their own food (like plants)

Cellular Respiration. Harvesting Chemical Energy So we see how energy enters food chains (via autotrophs) we can look at how organisms use that energy

4.1 EnergyforLife - · PDF filePhotosynthesis and Cellular Respiration Worksheets ... Autotrophs are organisms that make their own food. Most autotrophs use the energy in sunlight

CHARACTERISTICS OF CLASSIFICATION. 1. HOW ORGANISMS GET ENERGY Autotrophs Organisms that make their own food are called autotrophs. Auto- means “self”,