Unit 5 Period 3 Developing ideas&Presenting ideas（课件）英语外研版选择性必修第一册

Unit 5 Revealing nature 高中英语外研版选择性必修第一册 Developing ideas & Presenting ideas Learning objectives 1.Grasp key information about plant communication and learn related expressions. 2. Analyze the structure of the expository text and discuss plant‑research values. 3. Realize nature’s wonders and respect the harmony between humans and nature. Contents 1. Lead in 2. Pre-reading 3. While-reading 4. Post-reading 5. Summary 6. Assessment 7. Homework 01. Lead in For me, I found it definitely amazing that trees can communicate with animals and people in Avatar! Have you seen the film Avatar？ What interesting facts can you recall about this film? 5 attack breathe eat sleep move speak steal think √ √ √ √ √ What do you think plants can do? Tick the boxes. How much is it realistic that trees can communicate with people? Can plants like trees even behave in many other ways like humans do? Let’s find out whether plants communicate with each other. If they do, how? 02. Pre-reading Read the passage and find out the ways in which plants communicate. They can communicate with each other in three ways： by using chemicals sound and “wood wide web” What’s the type of writing about the passage? An expository essay (说明文) 9 Introduction with a topic to catch readers’ attention, and a thesis statement to present the main concept of your essay. Body: the first, second, third… point / argument with supporting evidence Conclusion with a concise summary of your key points / a thesis statement. Expository essay structure Part 1 Introduction and thesis statement Part 2 Body Part 3 Conclusion Read the passage and match each paragraph with its main idea. Para. 1 Para. 3 Para. 4 Para. 2 a. Plants use chemicals to communicate with each other. b. Plants use sound to communicate. c. Talking plants have been a thing of myths and legends. d. It draws a conclusion and looks forward to future research on plant communication. e. New research has revealed that plants can communicate with each other. Para. 5 f. Plants use the wood wide web to communicate. Para. 6 03.While-reading Para. 1 — a thing of myths and legends Talking trees give _____________________ to people, eg., Alexander the Great and Marco Polo were said to have visited such a tree in India. Talking plants —————— Evidence from stories of many cultures Evidence from ________________ some modern stories Trees in the film Avatar can communicate with ___________________. animals and people advice and warnings Read for paragraph organisation: Para. 2 Read to answer the questions: 1. What relation is implied (暗含) between this part and the rest of Para. 2? 2. What’s the role of Para. 2 in developing the whole passage? Para 2 is used to clearly illustrate the thesis statement. It’s also a transitional paragraph. An adversative relation (转折关系). (For long we have believed that talking plants are just fantasy, however, plants do communicate as revealed by research, which is amazing.) 14 Para. 3 bean plant A _____ bean plant B ______ the chemicals ________ insects away drive ________ the wasps kill Q1. How does a bean plant use chemicals to communicate with each other? releases its _____, different chemicals _________ tiny amounts of _____________ as a warning or call for help: “I’m being attacked!” release chemicals attack detect own attract ___ Read to answer the questions: Scientists hope to learn more about this plant warning system, so that we can use it to grow crops without _________. pesticides Q2. Why do scientists do research on this plant warning system? A. To explore the wonders of nature. B. To apply it into agriculture. C. To protect plants. D. To predict the future of plants. √ Q3. What figure of speech修辞手法 is being used when the plants are described as calling for help? A. simile D. personification C. hyperbole B. metaphor √ Can you find more examples in the coming paragraphs? Para. 4 Read to work out the table: Plants How they communicate using sound Example corn and chilli plants ____________ with their roots listen to the noises from ___________ some trees make noises other plants make clicking noises when there is not ___________, indicating drought is arriving. enough water A chilli plant can tell if a _____________________ is helpful, or unfriendly. neighbouring plant Most surprisingly of all, plants have an amazing system of communication that can link nearly every plant in a forest. Scientists call this system the “wood wide web”. It is in some ways similar to the Internet we use. While the Internet is a worldwide network of computers linked by cables and satellites, the wood wide web is linked underground by fungi. This fungal network links the roots of different plants to each other. Using the wood wide web, plants can share information and even food with each other. For example, some pine trees can send food to smaller pine trees to help them grow. But just like our own Internet, the wood wide web has its own version of “cybercrime”. Plants can steal food from each other, or spread poisons to attack other plants. Perhaps one day scientists will learn how to create a “firewall” to help prevent these attacks within the wood wide web. roots of different plants are linked to each other underground by _____ enables plants to perhaps one day it will be created to help prevent attacks within wood wide web share information and even food with each other Para. 5 Read to fill out the table about : plants steal food from each other plants spread poisons to attack other plants fungi firewall wood wide web cybercrime how it is linked ______ 19 Para. 6 Scientists are learning more every day about the secret ways in which plants talk to each other. Who knows? Maybe one day we will know enough about plant communication to be able to “talk” with them ourselves. What is the function of Para. 6? Para 6 is a conclusion and a restatement (重述) of the passage topic. It also raises an expectation about future research of plant communication. Read to answer the question: 04. Post-reading 1. What do you think are the benefits of studying plant communication? Think Share It will help us know more about the world of plants and then get a better understanding of the secret of nature and encourage us to explore more about the mysterious nature. What’s more, it will teach us an important lesson, that is, human should live in harmony with mother nature. And it is our responsibility to fulfill the mission. 22 2. What discoveries are described in the two reading passages in this unit and what do their meanings have in common? Think Share Passage 1 reveals the discovery of evolution. They all reflect that there are numerous secrets in nature that remain to be explored. Passage 2 reveals the discovery of communication between plants. 23 Group Work Give a talk about communication between living things. 1. Read the passage again and talk about how plants communicate. 2. Think about and discuss the following ways of communication in the animal world. • Bees “dance” to signal to other bees that they have found food. • Ants communicate with each other through touch, chemical signals, moving their bodies and even using their legs to make sounds. • What other ways can you think of? 24 Give a talk about communication between living things. 3. Organise your ideas following the steps below. • Begin with what living things you have chosen to talk about. • Explain how they communicate and give examples. • Conclude by explaining what we have learnt from their behaviour. 4. Give a talk to the class about communication between living things. 25 05. Summary Using chemicals Using sound Using the “wood wide web” Maybe one day we will be able to “talk” with plants. plants can communicate with each other 06. Assessment Lead-in Assessment Content Standards Starts(1-3) self-assessment Can I describe how plants communicate with each other? ☆ ☆ ☆ mutual evaluation Does my partner's dialogue sound natural and smooth? ☆ ☆ ☆ 07. Homework Look at the pictures and talk about how the sunflower grows. Write your observational journal about the sunflower. Homework 31 1 June Covered with 1–2 cm of moist soil, the sunflower seed takes a few days to come up after being planted. Water has been added regularly and the hard seed coat softens in the damp soil to allow the first root to pierce downwards and the first leaves to push to the soil surface. 6 July The root continues to grow downwards. The single stem grows hollow and smooth, revealing large spade-shaped leaves from the growing tip. Gradually, the plant’s growing tip reveals the first hints of development of the flower bud. The plant stem becomes more woody. 26 July About three weeks after the flower bud first becomes visible at the tip of the sunflower stem, it enlarges and begins to reveal a flattened disc. Over the course of one week, the yellow ray florets, the disc florets bloom across the core of the sunflower blossom. It is yellow, looking beautiful. An observational journal about the sunflower 32 Thank you for your listening $