(c) McGraw Hill Ryerson 2007 Unit 1 Chapter 2 Living and Non-Living Things Interact in Ecosystems Section 2.2: Roles of Organisms in Ecosystems Slide Show #5

(c) McGraw Hill Ryerson 2007 Classification – Food Getting Scientists Classify Organisms in a variety of ways. One common method of Classification is through the organisms roles in food getting and nutrient use. Note all organisms on Earth require food energy for life, growth and repair, However organisms means of obtaining such food vary considerably

(c) McGraw Hill Ryerson 2007 Classification – Food Getting The categories used to classify organisms on this basis are…. Producers Consumers Decomposers

(c) McGraw Hill Ryerson 2007 Producers - are organisms capable of making their own food to provide energy for life Green plants – The most common type of producer. These organisms produce their own food using energy from the sun through a process called photosynthesis. Producers

(c) McGraw Hill Ryerson 2007 Consumers Consumers - Organisms (Usually Animals) that rely on other organisms for food. Consumers obtain food energy through the ingestion of other organisms. There are Three Categories of Consumers Herbivore Carnivore Omnivore

(c) McGraw Hill Ryerson 2007 Consumers: Herbivores Herbivores are consumers which eat only plants for food energy.

(c) McGraw Hill Ryerson 2007 Consumers: Carnivores Carnivores are consumers (usually animals) that obtain food energy by eating other consumers.

(c) McGraw Hill Ryerson 2007 Consumers: Omnivores Omnivores are consumers (usually animals) that obtain food energy by eating both producers and other consumers.

(c) McGraw Hill Ryerson 2007 Decomposers Decomposers – Organisms which breakdown break down dead organisms returning nutrients to the soil. Examples of Decomposers Include Micro organisms such as bacteria Invertebrates such as earthworms Fungus such as Mushrooms and Moulds

(c) McGraw Hill Ryerson 2007 Food Getting - Review Try This Game

(c) McGraw Hill Ryerson 2007 Many of you have probably witnessed evidence of decomposition and the growth of microorganisms as you discovered 3 month old sandwiches in the back of your locker. What Conditions do you think would affect the growth of microorganisms ? Decomposers: Micro-organisms

(c) McGraw Hill Ryerson 2007 The conditions that affect microorganism growth Include….. As a class brainstorm to identify the ideal conditions. FactorsIdeal Conditions Temperature Moisture Light Acidity Salinity Decomposers: Micro-organisms

(c) McGraw Hill Ryerson 2007 Decomposers: Micro-organisms Microorganisms are found in a variety of habitats including (air, soil, water) Because of their variety and abundance, these organisms pose a significant problem for human food supplies as the micro-organisms, if they contaminate food will begin the process of decomposition.

(c) McGraw Hill Ryerson 2007 Because of the ability of micro-organisms to contaminate human food supplies humans have developed food preservation techniques to prevent the growth of those microorganisms. Decomposers: Micro-organisms

(c) McGraw Hill Ryerson 2007 You may have witnessed some people drying Salt Cod Fish during the recent food Fishery. Why do you think they would do this? Food Preservation

(c) McGraw Hill Ryerson 2007 Numerous food preservation techniques inhibit the growth and reproduction of microorganisms. These Include: Food Preservation Preservation TechniqueWhy It Works Pickling Salting Drying Smoking Refrigeration Freeze - Drying Radiation Canning

(c) McGraw Hill Ryerson 2007 Questions Chapter 2 Assignment Questions (Part B) Will be given to you on a handout!