人教版选修九Unit 4《Exploring plants Writing》ppt课件

Writing task
When 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);
seeds
grow?
Dish C
No
Because they didn’t get any water.
Because they were watered
Dish D
No
with boiled water which has no oxygen. Also, they were
covered with oil which
4. Take Dish C and put it next to Dish A. Do not water it.
5. Take Dish 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.
Outline
Aim: To find out three important conditions that seeds need in order to start growing. Materials:
1. four dishes A B C D
2. four pieces of cloth
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.
Dish B tap water, cold temperature, oxygen
Dish C no water, warm temperature, oxygen
Dish D boiled water, oil, warm temperature, no oxygen
Fourth listening Now listen to the second part of the tape in which the class discusses the results of the experiment. Complete the table of results.
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 other growing up toward the light.
3. Where are the materials that 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.
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.
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.
Did the Reasons why or seeds grow? why not
Yes Dish A
Dish B
No
Because ห้องสมุดไป่ตู้hey had water, warmth and oxygen.
Because it was too cold.
Did the Reasons why or why not
experiment is? What order do you think the pictures
should go in?
Number the pictures in the order you
hear about them.
3
1
5
4
2
Listen to the first part again and answer the questions.
Results
Dish A: The seeds grew. Dish B: The seeds didn’t grow. Dish C: The seeds didn’t grow. Dish D: The seeds didn’t grow.
Conclusion Seeds need warmth, water and oxygen to grow.
Plant three beans in a pot, water them and leave them in a warm, light spot.
Two small shoots appear.
Cut the ends off a plastic bottle.
Wrap the bottle in dark paper.
● what the “procedure” tells you (the steps you carry out to set up the experiment); ● the grammatical structures used for each section of the report.
Then I placed Dish A in a well-aired warm spot by the window, took Dish B and wet it with tap water and put it in the fridge, took Dish C and put it next to Dish A without watering it.
So I drew 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:
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.
3. some boiled water 4. some tap water 5. a dish of seeds 6. some cooking oil
Procedure: 1.Put the pieces of cloth on the dishes. Spread 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 spot—so by the window over there would be fine. 3. Take Dish B, wet it with tap water and put it in the fridge.
Third listening
Listen to the first part again and complete the table of conditions that each dish of seeds was given.
Conditions
Dish A tap water, warm temperature, oxygen
Experiment reports
Listening on P79 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
prevented oxygen getting
to the seeds.
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.
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.