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Topic 2.1 Living Organisms Living or Not??? Functions and Structures All living organisms have to carry out certain functions to stay alive. To carry out these functions, organisms have different structures. 1. Energy: Animals get their energy from their food. What structures do different animals have to gather and use food? Most plants use the energy of the Sun to make their own food. What structures do plants have to make food? 2. Environment: Plants need light to make food, so they will bend toward a light source. What structures in plants enable them to move in this way? Raccoons feed at night, and deer feed during the day. They both use their eyes to see under very different conditions. In what ways are their eyes similar and different? 3. Reproduction: Living organisms reproduce so that life can continue. A wolf has pups. A watermelon has seeds. Do a wolf and a watermelon reproduce in the same way? What structures enable wolves to reproduce? What plant structures produce seeds? 4. Growth: A dandelion grows from a seed. What structures enable a plant to grow? You grew from a baby to your present size. What structures inside your body enabled you to grow? Why and how do all living organisms grow to the sizes they do? 5. Wastes: Animals get rid of waste gases like carbon dioxide. They also get rid of other wastes through urine and feces. What structures do they have to perform these functions? Plants also give off wastes as gases. What structures help plants do this? Levels of Organization in Organisms - organisms have systems which perform the functions that keep that organism alive - systems are made up of organs - organs are made from tissue - tissues are composed of cells Examples: page 100 - figure 2.1A The Human Circulatory System - figure 2.1C A Plant?s Shoot System Topic 1 Review p. 102 # 1 - 4