(
课件网) Unit 5 The power of plants 第1课时 Starting out —Understanding ideas Lead in What’s this video about And what do you know about plants Starting out 1.What facts about plants do you know 2.Do you think plants are amazing Why or why not 1 Look at the picture and answer the questions. What facts about plants do you know Some plants eat bugs. Many plants are used for medicine. Plants have different colours. Some plants are poisonous(有毒的). 1.What are the people doing She is buying vegetables. He is making wooden shelf. They are weighing herbs. She is painting outdoors. 2 Look at the picture and answer the questions. 2.What can plants do for us They can provide food. They can provide building materials. Some plants are medicine. They can make the environment beautiful. Look at the picture of a plant and match the words to it. sugar leaf sunlight water sunlight sugar water leaf Pre-reading 1 Read the passage and check your answers. 2 While-reading Read the passage and match the main idea with each paragraph. Paragraph 1 Paragraph 2 Paragraph 3 Paragraph 4 Paragraph 5 Plants produce substances(物质). How plants work. Introduce the Worker No. 55. The importance of plants. Workers in plants will have a rest. Read Para.1 carefully, then answer the questions. 1. Can you find Worker No. 55 in the picture 2. What is he going to do He is going to start work in the plant. Further thinking 1. Are there any real workers in the plant 2. Why does the writer use "workers" in the passage No! Here the writer uses personification (拟人) to make the passage more vivid and easier for the readers to understand. Read Para.2 carefully, then answer the questions. 1. Where does No.55 worker work 2. How many workers in each workshop 3.What do they do In workshop 1001 in the leaf. There are 20 to 100 workers. They collect sunlight and Cduring the day. They send up water. They will mix water, C,and sunlight. Further thinking Worker is actually a chlorophyll (叶绿素) Workshop is actually a chloroplast (叶绿体) Read Para.3 carefully, then answer the questions. 1. What are the two main products 2. Which product is useful for the growth of the plant 3. Which product is important for animals and humans Why The two main products are sugar and oxygen. Sugar. Oxygen is important for animals and humans because they need it to breathe. Read Para.4 carefully, then answer the question. Further thinking Why will workers take a rest in dark Because there isn’t sunlight during the night, so the workers stop working. Light affects(影响) photosynthesis. Read Para.5 carefully, then answer the question. Further thinking How would the natural world be different without plants Choose another suitable title and give your reasons. a How to make sugar b How plants work c Why plants are great d Going to the green workshop 3 Complete the texts with the words and expression from the passage. Sunlight and CO2 enter the 1._____. 3._____ , ... ...
