We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you!
Presentation is loading. Please wait.
Published byMichael Washington
Modified about 1 year ago
1 of 38© Boardworks Ltd 2008 Feeding relationships
2 of 38© Boardworks Ltd 2008 Food chains and webs
3 of 38© Boardworks Ltd 2008 Feeding types Different types of organism can be grouped in several ways. One grouping system is based on how organisms obtain their food. Some organisms produce their own food. They are called producers. Plants produce their own food using light energy from the Sun. Some types of bacteria can also make their own food by using light or chemical reactions. Other organisms cannot make their own food. They are called consumers.
4 of 38© Boardworks Ltd 2008 Producer or consumer?
5 of 38© Boardworks Ltd 2008 Consumers Consumers can be grouped into different types: Herbivores These consumers eat producers. Carnivores These consumers eat other consumers. Omnivores These consumers eat other consumers and producers. Omnivores eat animals and plants. Most humans are omnivores.
6 of 38© Boardworks Ltd 2008 Feeding types
7 of 38© Boardworks Ltd 2008 Predator-prey relationships Animals that are high up in food chains, such as the fox, tend to be hunters that are skilled at locating and killing their food. These hunters are called predators. Common prey adaptations include camouflage or the ability to produce poisonous toxins. The animals on which the predator feeds are called their prey. Prey animals tend to be well adapted to avoid the predator.
8 of 38© Boardworks Ltd 2008 Prey population changes The relationship between predator and prey population numbers in a food web is very close and follows a cyclical pattern. This means that it rises and falls in a fairly regular cycle. Why is this? Individual rabbits must compete for food and mates, and must also avoid being killed by their predators, the foxes. The rabbit population changes due to both the vegetation growing season and changes in the fox population.
9 of 38© Boardworks Ltd 2008 Predator population changes The fox population also follows a cyclical pattern very similar to the rabbit population. Why is this? The fox is very dependent on rabbits for food, so as the rabbit population changes so does the fox population. This is why the fox population rises and falls slightly after the rise and fall of the rabbit population. How do cyclical rises and falls in population numbers affect the organisms in a larger food web?
10 of 38© Boardworks Ltd 2008
11 of 38© Boardworks Ltd 2008 Food chains – who eats what? Can you see a food chain in this habitat?
12 of 38© Boardworks Ltd 2008 Food chains A food chain is a sequence that shows how each individual feeds on the organism below it in the chain. Each arrow means ‘eaten by’. caterpillarleafbirdfox What does this food chain show? A leaf is eaten by a caterpillar, which is then eaten by a bird, which is then eaten by a fox. Energy is transferred from one organism to another in the direction of the arrow.
13 of 38© Boardworks Ltd 2008 Food chains – draw your own Draw your own food chains based on the following guidelines: A food chain from a forest habitat. A food chain from an ocean habitat. A food chain with four organisms in it. A food chain that ends with you! Use arrows ( ) to show the transfer of energy between the organisms that you choose.
14 of 38© Boardworks Ltd 2008 An Antarctic food chain
15 of 38© Boardworks Ltd 2008 Producer, herbivore or carnivore? What are the feeding types of the animals in this food chain? From a food chain, we can tell if an organism is a producer, a herbivore or a carnivore. If the producer is a plant, only a small part of it might be involved in the food chain, such as its seeds, fruits, leaves or even dead leaves. Food chains always start with a producer. snailleafbirdowl
16 of 38© Boardworks Ltd 2008 Name that feeding type
17 of 38© Boardworks Ltd 2008 Ranking consumers Consumers eat plants or animals, or both. A food chain can be used to rank different types of consumers. Producers – make their own food. Primary consumers – eat producers. Secondary consumers – eat primary consumers. Tertiary consumers – eat secondary consumers. producerprimary consumer secondary consumer tertiary consumer seaweedlimpetcrabhuman
18 of 38© Boardworks Ltd 2008 Primary, secondary or tertiary?
19 of 38© Boardworks Ltd 2008 What is a food web? Why is it a good idea for an organism to have different sources of food? Animals usually eat many different things and are involved in lots of different food chains: These food chains can be put together in a food web, which shows how the food chains are connected. What would the food web for these food chains look like? plantsowlaphidblue titladybird plantsmothowlblue tit plantsvolestoat plantsvoleowl
20 of 38© Boardworks Ltd 2008 Food webs bluetit owl chiffchaff stoat vole plant aphid ladybird moth spider
21 of 38© Boardworks Ltd 2008 Using a food web 1. Name the producer in this food web. 2. Name two herbivores in this food web. 3. Name two species that are top carnivores. 4. How many secondary consumers are there? 5. Which food chains include the moth?
22 of 38© Boardworks Ltd 2008 Build a food web
23 of 38© Boardworks Ltd 2008 Changes in the food chain Nearly every species of animal is dependent on a number of other species for survival – this is called interdependence. Currently human activity is damaging the natural habitats of many animals. If the population of a species declines dramatically how might this affect the other species that depend upon it? This will not only affect the animals in the area, but it could have far-reaching effects on the rest of the species in the food web.
24 of 38© Boardworks Ltd 2008 Changes in a food web
25 of 38© Boardworks Ltd 2008 Food chain populations
26 of 38© Boardworks Ltd 2008 Biomass
27 of 38© Boardworks Ltd 2008 Food for energy Why do organisms need to feed? Most animals get their energy from food. If the producers at the bottom of the food chain are small organisms, then the consumers at the top of chain need to eat many of them to gain enough energy. Much of the energy that prey generate is lost on a daily basis through heat, growth and waste. Very little energy is actually transferred to the predator.
28 of 38© Boardworks Ltd 2008 What can a pyramid of numbers show about energy transfer? Food chains and pyramids
29 of 38© Boardworks Ltd 2008 Pyramids of numbers only give an accurate impression of the flow of energy in a food chain if the organisms are of similar size. Measuring the biomass (living material that makes up all organisms) at each level in the food chain can give a more accurate picture. Pyramids of numbers are a numerical way of representing food chains. What are the problems of representing food chains in pyramids of numbers? They record the number of organisms at each level in the food chain. What are pyramids of numbers?
30 of 38© Boardworks Ltd 2008 Numbers or biomass?
31 of 38© Boardworks Ltd 2008 In a pyramid of numbers, the length of each bar represents the number of organisms at each level in the food chain. As a single tree can support many organisms, this food chain produces an unbalanced pyramid. Understanding pyramids of numbers
32 of 38© Boardworks Ltd 2008 Understanding pyramids of biomass In a pyramid of biomass, the length of each bar represents the biomass at each level of the food chain. At each level, the amount of biomass and energy available is reduced, giving a pyramid shape.
33 of 38© Boardworks Ltd 2008 Death benefits? When animals and plants die, they are decomposed by microbes. In this way, the nutrients that were stored in animals and plants are eventually returned to the soil. As the number of producers increases, how will this affect the populations of organisms higher up in the food chain? The nutrients fertilize the soil, helping producers, such as plants, to grow better.
34 of 38© Boardworks Ltd 2008 Food chains and pyramids
35 of 38© Boardworks Ltd 2008
36 of 38© Boardworks Ltd 2008 Glossary
37 of 38© Boardworks Ltd 2008 Anagrams
38 of 38© Boardworks Ltd 2008 Multiple-choice quiz
2 of 38© Boardworks Ltd 2008 Behaviour Focus: take a step back and the view is wider – we only need work to be done Copy and leave space to write answers/
© Boardworks Ltd of 20 © Boardworks Ltd of 40 KS3 Biology 7C Feeding Relationships.
Read the following paragraph about who eats whom in the Antarctic and draw a food chain that shows the feeding relationships in this habitat. Don’t forget.
© Boardworks Ltd A slide contains teacher’s notes wherever this icon is displayed - To access these notes go to ‘Notes Page View’ (PowerPoint 97)
1 of 6© Boardworks Ltd of 6© Boardworks Ltd 2011 An Antarctic food chain.
Entry Activity… An organism that only eats other consumers. An organism that only eats producers. An organism that makes its own food. An organism that.
Classroom Rules 1.I will enter the classroom quietly and orderly. 2.I will always be prepared for lessons with equipment and planners on desk. 3.I will.
Food Chains & Food Webs D. Crowley, 2008 Food Chains & Food Webs To understand food chains and food webs, and the transfer of energy within these Saturday,
Environmental Biology & Genetics Energy Flow M r G D a v i d s o n.
A food chain tells us what is eaten by what in an ecosystem.
© Boardworks Ltd of 20 © Boardworks Ltd of 25 KS3 Biology 8D Ecological Relationships.
Food Chains & Food Webs D. Crowley, 2008 Key terms Producer - utilise the sun’s energy to produce their own food, e.g. plants and algae Consumer - organisms.
Food Chains/Food Webs. How Organisms Interact Autotrophs – Organisms that use energy from the sun or energy stored in chemical compounds. These types.
INTERACTION OF LIVING THINGS AND CYCLES IN NATURE. Chapter 2 and 3 review.
Food Chains and Food Webs. Food Chains Food Chain: a step-by-step sequence linking organisms that feed on each other All food chains begin with a producer,
Food Chains/Webs Investigative Science Basha High School.
AIM: How do plants & animals depend on each other and their physical environment? 4/25/13 DO NOW: 1.Put last night’s Review Sheet in the basket. 2.Pick.
Energy Flow B4e. OBJECTIVES Key Objective Explain the flow of energy in the environment Construct pyramids of numbers from given information and explain.
Pyramids Of Number & Biomass D. Crowley, Pyramids Of Number & Biomass To understand pyramids of number and biomass Friday, May 01, 2015.
Pyramids of biomass All learners will be able to: Describe what biomass is and where it comes from. Draw pyramids of biomass to show the relationship between.
Food Web Producers, consumers, & decomposers. Three main components to the food web Producers Consumers Decomposers.
Interpreting Food Webs. Energy Diagrams Food Chain- shows a single pathway of energy flow in an ecosystem Food web- shows multiple pathways of energy.
Ecosystem Structure. Passing of Energy All Energy starts from the sun Photosynthetic plants convert energy from the sun into food The energy moves through.
Energy in Ecosystems Note: Organisms interact in order to obtain energy and resources necessary to survive.
Energy and Nutrient Transfer Food chains and Food webs Objectives: *Describe a food chain and each feeding stage in it **Distinguish between a food chain.
Energy Flow Through an Ecosystem Food Chains, Food Webs, Energy Pyramids.
Explore energy flow through living systems In this presentation you will: Death and decay Decomposers release nutrients into the soil Plants take up the.
Energy transfer. Energy sources The sun provides almost all the energy to sustain life. Producers use Photosynthesis or Chemosythesis acquire the energy.
Everything is Connected. All living things are connected in a web of life Ecology is the study of the interactions of organisms with one another and with.
Web of Wildlife. All living things need food to survive. –Organisms obtain their food in different ways. −Some animals eat plants, some eat other animals.
Interdependence. Populations An organism obtains food, water, shelter, and other things it needs to live, grow, and reproduce in its environment.
© Boardworks Ltd of 6. © Boardworks Ltd of 6 Predators and prey A predator is an animal that hunts and kills other animals for food. The animal.
Four Laws of Ecology: Everything is connected to everything else. Everything must go somewhere. Nature knows best. There is no such thing as a free lunch.
Top Predator Mongolian Saker Falcon Food Chains
Basic Life Science Unit 1 Lecture Pages Chapter 12.
© 2009 Marshall Cavendish International (Singapore) Private Limited.
The Biosphere – Part 1 Biology 1. What is Ecology? Ecology is the study of interactions among organisms and between organisms and their environment (includes.
Ecology Chapter 1 Section 3 OBJECTIVES: OBJECTIVES: 1. Explain how living organisms move energy through an ecosystem. 1. Explain how living organisms.
Energy in Ecosystems. All organisms require energy to live Recall Photosynthesis: Recall Photosynthesis: Energy from the sun is “captured”. The energy.
Ecology. Ecology Ecology is the study of interactions between different kinds of living things and their environment. Ecology is the study of interactions.
Food Webs, Food Chains, and Food Pyramids Producers, Consumers and Decomposers.
Unit 3 Ecosystems Chapter 6. Part 1 The Web Of Life p. 92 & Food Relationships p. 93 Questions #3-9 in the book.
Biomass: Refer to the total mass of living plants, animals, fungi and bacteria in a given area. Energy Flow: Flow of energy from an ecosystem to an organism.
Food Chains. What kind of things do we see when we walk through the woods? O We might see: O Plants O Small animals and insects O Nonliving things such.
B(4-2) How do organisms get energy? Copyright © Houghton Mifflin Harcourt Publishing Company Vocabulary producer food chain consumer food web energy pyramid.
Starter Activity: On a show me board answer these questions: 1.What does a food chain always start with? 2.What does the arrow in a food chain represent?
Unit 3 Ecosystems. Ecosystem Ecosystem - the network of relationships among plants, animals and the non-living parts in an environment.
Living Things. Food Chain Shows how energy from organisms passes from one organism to another Shaped like a chain.
2.1 Energy Flow in Ecosystems Biomass is the total mass of all living things (ie. plants, animals, fungi, bacteria) in a given area. –Biomass can also.
© 2017 SlidePlayer.com Inc. All rights reserved.