Presentation on theme: "Food Chains and Ecosystems"— Presentation transcript:
1Food Chains and Ecosystems 4th Grade Life ScienceFood Chains and Ecosystems
2Food Chains All ecosystems contain food chains Food Chains All ecosystems contain food chains. Each food chain contains both predators and prey.
3A food chain shows the order in which animals eat plants and other animals. Each part of a food chain is a link connected to other links.
4Food ChainsFood chains show what eats what in order to gain the energy it needs to live.Food chains use arrows to show what eats what.Eaten by:Eaten by:
5Plants Plants are at the beginning of virtually EVERY food chain They are PRODUCERS and use sunlight to make sugar in a process called PHOTOSYNTHESISThese sugars are stored in their leaves, stems, fruits, and roots
6Review Question #1 Which organism in this food chain is the producer? A The bunnyB The owlC The flowersD The sun
7Answer Question #1C The flowers are a producer because they can make their own food using sunlight. Remember, mushrooms are decomposers. They break down the tissues of dead plants and animals.
8Consumers Animals are consumers. Some consume plants to get the energy they need to live.Others consume other animals.
9Herbivores Herbivores are animals that only eat plants. Herbivores are found at the beginning of the food chain because they eat the producers (plants)
10Review Question #2 Which organism in this food chain is the herbivore? A The bunnyB The owlC The flowersD The sun
11Answer Question #2A The bunny is an herbivore. It is the only organism in the food chain that is a plant eater.
12Carnivores Carnivores are animals that eat meat. Carnivores will also eat animals that eat plants.They never eat producers and are usually at the top of food chains.
13Omnivores Omnivores will eat both plants and animals. Some animals eat both plants and meat.Most people are omnivores
14Food WebsFood webs show how the many different food chains in an ecosystem are connected.
15Food Web Most organisms eat more the JUST one organism Food webs are more complex than food chains and involve lots of organisms
16Review Question #3 A owl B rabbit C deer D black bear The diagram below shows a food web. Which animal is an omnivore?A owlB rabbitC deerD black bear
17Answer Question #3D The black bear is an omnivore because it eats both berries (plant) and rabbits (meat). The red fox is also an omnivore. The rabbit and deer are herbivores and the owl is a carnivore.
18CompetitionAnimals may compete with others in an ecosystem for the same resources.For example, off the coast of Washington, sea lions and fishermen both want to catch salmon. This leads to competition between the two groups.
19Review Question #4The diagram below shows a food chainWhich of following animals might compete with the bird in this food chain?A deer C lizardB grasshopper D lion
20Answer Question #4C The lizard would compete with the bird because they both eat the same food: insects.
21DecomposersDecomposers break down dead and decaying matter, including poop, and return the nutrients to the soilBacteriaMushroomsCertain InsectsAre ALL examples of DECOMPOSERS
22Review Question #5 Which of the following organisms is a decomposer? A TurtleB MillipedeC FlowerD Spider
23Answer Question #5B A millipede is an example of a decomposer. Flowers are producers and turtles eat living things like plants and insects. Spiders are carnivores. They eat bugs.
24All ecosystems have the same parts: They can be characterized by their Living FactorsNonliving Factors
25The nonliving parts of an ecosystem include: Nonliving FactorsThe nonliving parts of an ecosystem include:Water SoilMineralsSunlightAir
26Living Factors The living parts of an ecosystem. They include the producers like plants and consumers like herbivores, carnivores, omnivores, and decomposers.
27Review Question #6Which of the following choices contains two nonliving factors in an ecosystem?A air and plantsB animals and waterC plants and animalsD air and water
28Answer Question #6D Nonliving factors are things in an ecosystem that are NOT living, like air and water.
29AdaptationAnimals and plants have special features that allow them to survive well in particular environments.For example, the thick fur of the polar bear allows it to survive in the Arctic.An iguana, with no fur, would not survive the harsh Arctic climate.
30Food webs and ecosystems can be affected by changes in animal populations. If a disease killed all the birds in this ecosystem, then the population of horseshoe crabs would increase because there are no birds to eat them, and the population of razor clams would decrease because all the horseshoe crabs would be eating them.
31Review Question #7What would happen right away to the rat population if all the coyotes were shot by hunters?A their population would increaseB their population would decreaseC there would be no change in their populationD they would all get sick
32Answer Question #7A If all the coyotes were gone, the rats would have no predators and their population would increase.
33Plants and animals depend on each other Plants need animals, like birds and insects for pollination.
34Plants and animals depend on each other Plants also need animals to disperse their seeds. Animals can eat the seeds and pass them out later in their waste, or seeds might stick to an animal’s body
36Review Question #8Peach trees have sweet-smelling blossoms. Why do the flowers have such a sweet smell?A to create nice-smelling flower arrangementsB to attract bees for pollinationC to scare away predatorsD to protect the tree from disease
37Answer Question #8B Plants depend on animals for pollination. Bees are great pollinators. The sweet smell of the flowers and fruits attracts the bees to the tree.
38MicroorganismsMicroorganisms are organisms that you need a microscope to see.They can HELP you and HURT youHelpful: Harmful:1. Bacteria in yogurt 1. Viruses cause illnesses2. Fungi to make antibiotics 2. Bacteria can spoil food3. Bacteria that decompose 3. Mold can grow ondead matter food, like bread,and ruin it