UNIT X UNIT 7 | 259 FORMATIVE ASSESSMENT DIFFERENTIATED INSTRUCTION Scaffold To help students answer the Check In questions, write these sentence frames on the board: The trees in a tropical rain forest _____. Complex means _____. Have students answer the questions in small groups. Then elicit answers from the groups and write them on the board. Amplify Have students read the last paragraph. Ask: How can people protect the environment? Have students brainstorm ideas in small groups. Then have them share ideas with the class. Talk and write: Biomes of the World Ask and answer in pairs: What four biomes did we read about? Write a sentence that describes one biome—tundra, desert, grassland, or forest. Write a sentence explaining one effect that people have on biomes. Reading • Follow the instructional routine for reading. The following strategies are a sample routine. • Preview heading and images Point out the heading and photos. Ask: What does effect mean? (result, impact) If needed, review the section on cause and effect on page 245. Ask: What do these photos show? What do you think the text will tell us about people’s effects on biomes? • Match oral to written words Play the audio for page 259 and ask students to read along silently, tracking the print as needed. • Build fluency Play the audio again. Then practice echo reading. Model smooth reading, pause, then have students reread chorally, imitating your pronunciation, intonation, and pacing. • Use new vocabulary Call attention to the word disruption. Ask a volunteer to read the sentence with this word aloud. Then draw attention to the word and definition in the glossary. Ask: What disruptions have you experienced? • Identify cause and effect Draw a cause and effect graphic organizer on the board. Read the first paragraph sentence by sentence. After the third sentence, write people build homes and communities in new areas in the first square. Say: This is the cause. Now let’s look for the effects. Continue reading, asking students to add effects to the graphic organizer. • Identify qualifiers Write this sentence on the board: Disruption of any of these things can hurt the entire biome. Say: Sometimes writers use words like can, may, or often to show that their ideas are not true 100% of the time. Ask students to find and circle other examples of the words can, may, or often in the paragraph. Ask volunteers to read the sentences aloud. Check In Ask and answer questions Have students work in pairs to ask and answer the questions. Ask students to share responses in a class discussion. ANSWERS 1. The trees in a tropical rain forest grow tall and have thick leaves at the top. This shades the ground and makes it hard for plants to grow close to the ground because they don’t get much sunlight. 2. Complex means complicated or involving many factors. PRACTICE Biomes have a complex balance of climate, geography, plants, and animals. Disruption of any of these things can hurt the entire biome. As people continue to build homes and communities in new areas, they often disrupt the ecological balance of an area. Air and water may become polluted, and plants and animals can die. Entire species may become endangered. When one species is endangered, the complex food web is affected, and many other species may also become endangered. People must learn to respect and protect the environment because human behavior affects Earth’s biomes and ecosystems. People E ects of on Biomes CHECK IN 1. Cause and effect How do trees affect the forest floor in a tropical rain forest? 2. Use context to develop vocabulary What does complex mean? GLOSSARY disruption a change in the way something normally happens 259 UNIT 7 Biomes of the World UNIT X7 / READING
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