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(共25张PPT)
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._________ , CO2 and sunlight will turn into 4._______and oxygen.
Oxygen is important
to humans — they need
it to 5._______.
Water from the root will
2.________to the leaf
through the stem.
leaf
Water
rise up
sugar
breathe
4
Post-reading
1.What does “plant” mean in the title
In the title, “plant” has a double meaning. Usually it means a living thing like a tree or flower. Here, it refers to a “factory” where “workers” make food for the plant and oxygen for us.
Think and share
Learning to think for question 1
A pun(双关语) is a word with more than one meaning. It’s a clever way to make the passage more interesting.
2. In what other ways do plants help the world
Thousands of plant species are cultivated for
beautifying the environment, （美化环境）
provide shade, （提供荫凉）
adjustment of temperature, （调节温度）
noise reduction, （减少噪音）
and prevent soil erosion. （防止水土流失）
How would the natural world be different without plants
Further thinking
People: There would be less oxygen in the air for us to breathe,
and we would have less food and medicines......
Climate change: without plants, the lever of carbon dioxide
would rise and lead to global warming....
Animals: A lot of animals would not have food and might not
survive.There would be fewer places for animals to
live, and we might lose many species(物种)......
No matter what will happen in the future,
now, we should protect plant !
1. They collect sunlight and C during the day.
他们白天收集阳光和二氧化碳。
collect /k lekt/ v. 收集，采集；使集中,其后可直接跟宾语。
collect 相关词汇：
e.g.:这位老人是一位伟大的收藏家。他喜欢收集各种花瓶。
他的收藏品很丰富。
Language points
The old man is a great collector. He likes collecting all kinds of vases. He has a large collection.
2. Then workers in the Leaf will mix water，CO and sunlight.
然后叶子中的工人们将混合水、二氧化碳和阳光。
mix /m ks/ v.（使）混合，拌和
mix 相关搭配：
e.g.:充分摇晃瓶子，让牛奶与茶混合。
Shake the bottle well so that the milk mixes with the tea.
3. What are they going to produce
他们将生产什么？
produce /pr dju:s/ v.（自然地）生产，产生，出产
e.g.:在父亲的帮助下，她找到了一家公司来生产她的杯子。
With the help of her father, she found a company to produce her cups.
produce /pr dju:s/ 产品；（尤指）农产品
e.g.:市场上有足够的农产品。
There is enough farm produce at the market.
拓展：
I.用括号内所给词的适当形式填空
1. More ____________(important) , we are growing together.
2. It’s _________(nature) for parents to worry about their children.
3. The boy has learnt French, English and Russian. So sometimes he
________ (mix) the three languages.
4. When we go shopping, we’d better compare (比较) the price of the
same _________ (produce).
5. We can’t see anything in the _________ (dark). Can you help turn
on the light
Exercise
importantly
natural
mixes
product
darkness
Ⅱ.完成句子
1. 地铁站在这里。
_______ ________ the subway station.
2. 明天变暖，气温会上升到10°C。
It will be warm tomorrow. The temperature will _______ _______ to 10°C.
3. 看英文电影对提高你的词汇量用用处。
Watching English movies is _______ _______ improving your vocabulary.
4. 我想我得停下来，否则我就会变成一台机器。
I think I have to stop, or I might _______ _______ a machine
5. 格林先生不仅仅是我们的老师，还是我们的朋友
Mr Green is _______ _______ our teacher. He is also our friend.
Exercise
Here is
rise up
useful for
turn into
more than
Homework
1. Use the words and expressions learned in this lesson to retell the
process of photosynthesis in plants.;
2. Design a poster to show the importance of photosynthesis, and
search for more information about the different uses and importance
of plants and share with your classmates.

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