高中英语（人教版选修9）课件： UNIT4《EXPLORING PLANTS》WRITING WORD版含解析.ppt

1、Experiment reports Look at the pictures in Exercise 1 and guess the answers to the questions:What materials are being used in this experiment?What do you think the purpose of the experiment is?What order do you think the pictures should go in?Listening on P79Number the pictures in the order you hear

2、 about them.23154 Listen to the first part again and answer the questions.1.What is the purpose of the experiment?To find out three important conditions that seeds need in order to start growing.2.Are students going to do the experiment in groups or individually?In groups.3.Where are the materials t

3、hat the students need to set up the experiment?On the bench.4.What materials do the students need to set up the experiment?Four dishes and four pieces of cloth,a dish of seeds,some tap water,some boiled water and some cooking oil.Third listening Listen to the first part again and complete the table

4、of conditions that each dish of seeds was given.ConditionsDish ADish BDish CDish Dtap water,warm temperature,oxygentap water,cold temperature,oxygenno water,warm temperature,oxygenboiled water,oil,warm temperature,no oxygenFourth listeningNow listen to the second part of the tape in which the class

5、discusses the results of the experiment.Complete the table of results.Did the seeds grow?Reasons why or why notDish ADish BYesBecause they had water,warmth and oxygen.NoBecause it was toocold.Did the seeds grow?Reasons why or why notDish CDish DNoNoBecause they were watered with boiled water which h

6、as no oxygen.Also,they were covered with oil which prevented oxygen getting to the seeds.Because they didnt get any water.Listen to the second part of the tape again and discuss the question:What was the conclusion of the experiment?Seeds need warmth,water and oxygen to grow.An experiment on plantsP

7、art1:Listen to a teacher(TH)helping her class set up an experiment.TH:OK,everybody,this morning were going to do an experiment to find out three important conditions that seeds need in order to start growing.LISTENING TEXTThe materials are all on the bench.Choose someone from your group to go and ge

8、t four dishes and four pieces of cloth,a dish of seeds,some tap water,some boiled water and some cooking oil.Look at the instructions on the board.Lets read through them.One:Put the pieces of cloth on the dishes and spread the seeds on the cloth.Label the dishes A to D.Two:Take Dish A and wet the cl

9、oth with tap water and place it in a well-aired warm spot so by the window over there would be fine.Three:Take Dish B,wet it with tap water and put it in the fridge.Four:Take Dish C and put it next to Dish A.Do not water it.Five:Take Dish D and water it with the boiled water.Then drop a small amount

10、 of oil onto the cloth and put it next to Dish C.Six:Leave them all for a few days.OK,now you can go ahead and set up the experiment.Part 2:Listen to the class discussing the results of the experiment.Students include Andrew(A),Rosemary(R)and Sandy(S).TH:Right,lets talk about whats happened in our e

11、xperiment.What are the results?Andrew?A:The seeds in Dish A have started growing but none of the others have.TH:Good.Why do you think the seeds in Dish B didnt grow?Rosemary?R:Because it was too cold?TH:Thats right.And what about Dish C?R:The seeds didnt get any water so they couldnt grow.TH:Yes.Now

12、,Dish D is interesting.The seeds got both water and warmth so why didnt they grow?Any ideas?Andrew?A:Well,the seeds got boiled water.TH:So,whys that important?Anyone?Well,boiled water has no oxygen in it and seeds need oxygen to grow.And What about the oil?Sandy?S:Wouldnt the oil make sure that no O

13、xygen could get to the seeds?TH:Excellent.Well done.So,whats our conclusion about three important conditions that a seed needs in order to start growing?S:That seeds need warmth,water and oxygen to grow.TH:Very good.Now I want you all to write up the experiment in your science notebook.Writing taskW

14、hen writing an experiment report,you can ask questions about:the position of the headings,what the headings are,their order:how the items in the“materials”section are presented (as a list);what the“procedure”tells you(the steps you carry out to set up the experiment);the grammatical structures used

15、for each section of the report.Outline Materials:ABCDAim:To find out three important conditions that seeds need in order to start growing.1.four dishes2.four pieces of cloth4.some tap water3.some boiled water 5.a dish of seeds6.some cooking oilProcedure:1.Put the pieces of cloth on the dishes.Spread

16、 the seeds on the cloth.Label the dishes A to D.2.Take Dish A and wet the cloth with tap water and place it in a well-aired warm spotso by the window over there would be fine.3.Take Dish B,wet it with tap water and put it in the fridge.4.Take Dish C and put it next to Dish A.Do not water it.5.Take D

17、ish D and water it with the boiled water.Then drop a small amount of oil onto the seeds and put it next to Dish C.6.Leave them all for a few days.ResultsDish A:Dish B:Dish C:Dish D:ConclusionSeeds need warmth,water and oxygen to grow.The seeds grew.The seeds didnt grow.The seeds didnt grow.The seeds

18、 didnt grow.Sample report:I did the experiment to find out three important conditions that seeds need in order to start growing.First,I put the four pieces of cloth on each dish,spread the seeds on the cloth and label the dishes A to D.Then I placed Dish A in a well-aired warm spot by the window,too

19、k Dish B and wet it with tap waterand put it in the fridge,took Dish C and put it next to Dish A without watering it.Finally I watered Dish D with the boiled water,dropped a small amount of cooking oil onto the seeds and put it next to Dish C.A few days later,I found that only Dish A grew.So I drew

20、a conclusion that seeds need warmth,water and oxygen to grow.Discussion:Look at the pictures of a plant experiment.The pictures are in the correct order.Discuss with partners about the processes the plants go through.Report each picture one by one:Plant three beans in a pot,water them and leave them

21、 in a warm,light spot.Two small shoots appear.Cut the ends off a plastic bottle.Wrap the bottle in dark paper.Lay the bottle on its side in the pot and put some wet paper towel inside.Put one of the seeds in the centre of the bottle.The seed have two long shoots,one heading towards the soil and the

22、other growing up toward the light.Sample:I planted three beans in a pot,watered them and left them in a warm light spot.In a week each seed had two small shoots.I cut the ends of a plastic bottle and wrapped it in dark paper.I laid the bottle on its side on the top of the pot of soil and place a wet piece of paper towel inside the bottle.I put one of the seeds in the centre of the bottle.Two weeks later the seed had two shoots,one growing up and the other growing down.So I drew a conclusion that shoots grow up towards the light,roots grow downwards into the soil.