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(共22张PPT)
Unit 5 The Power of Plants
Understanding ideas (1)
英语外研版七年级上册
通过本课时学习，学生能够：
1.读懂介绍植物光合作用的文章，从中提取关键信息，梳理植物工厂
的工作流程；
2.根据流程图准确复述植物是如何进行光合作用的；
3.认识到植物对人类生活的重要性，联系生活实际讨论如何保护植物，
树立起保护自然，人与自然和谐相处的价值观。
Learning objectives
重点
重点
Review and answer
How do plants make babies
By making seeds.
By growing a new part to become a new plant.
Free talk
How do small seeds grow into big trees
Who helps them
What do plants need to grow
Plants cannot move, but they need food to grow.
Look and learn
Can you guess the meaning of PHOTOSYNTHESIS
光合作用
How do plants make food
Look and learn
The leaves collect sunlight and CO2 for the plant.
The roots of the plant takes water from the soil and sends it to the leaves through stems.
v.收集
n. 阳光
n.根
n. 茎
n.树叶
Look and learn
The leaves are the food factory of the plant. They can mix water, sunlight and CO2 together to produce products like sugar and oxygen.
v.(使)混合
produce v. 生产
product v. 生成物
n.糖
n. 氧气
How do plants make food
Look and match
Look at the picture of a plant and match the words to it.
sugar
leaf
sunlight
water
sunlight
sugar
water
leaf
Look and predict
Can you predict what the text is about based on the title and the picture
sunlight
sugar
water
leaf
Read and choose
1. 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.
2. What type of writing is this passage
A. Narration (记叙文).
B. Argumentation (议论文).
C. Practical Writing (应用文).
D. Exposition (说明文).
Scan the passage and answer the two questions.


Read the passage and match the main idea with each paragraph.
Para. 1
Para. 2
Para. 3
Para. 4
Para. 5
Plants produce products.
How plants work.
Introduce the Worker No. 55.
The importance of plants.
Workers in plants will have a rest.
Read and match
What is the structure of this passage
A
B
C
①
②
③
④
⑤
①
②
③
④
⑤
①
②
③
④
⑤
Read and choose
1. Can you find Worker No. 55 in the
picture
2. When does Worker No. 55 start work
At 7:15.
3. What is he going to do
He is going to start work in the plant.
Read Para. 1 and answer the questions.
Read and answer
Read Paras. 2-4 carefully, and then fill in the blanks.
Read and fill
Sunlight and CO2
come into 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
Read and think
1. Are there any real workers in the plant What do the
workers mean to a plant in real life
No. The workers mean Chlorophyll (叶绿素).
2.Why does the writer use “workers” in the passage
Here the writer uses personification (拟人) to make the
passage more vivid and easier for the readers to understand.
Listen and read
Listen to the passage and read after it.
Step 1 Leaves of plants collect 1. _______.
Step 2 Plants collect 2. ____ from the air.
Step 3 Plants
3. ________ water from the root.
Animals and humans need it to 5. .
Useful for the growth of plant.
4. _____
O2
Fill and retell
sunlight
CO2
send up
sugar
breathe
Think and explain
What does “plant” mean in the title
A factory
A plant
Think and explain
What does “plant” mean in the title
The word “plant” has two meanings. One is about the living thing. The other is about the place the workers work in.
Learning to think:
A pun (双关语) is a word with more than one meaning. It’s a clever way to make the passage
more interesting.
Discuss and share
In what other ways do plants help the world
For people: provide food, clean the air and help stop the floods...
For climate: reduce the effect of climate change...
For animals: provide food and homes for animals...
Work in groups of three to discuss the question and share your opinions.
We should protect plants!
Interview and report
In what ways can we help protect plants in our daily life
Name Way
Lily Don’t waste food.
In our opinion, to protect plants we should ...
Interview your group members and do a report.
Homework
1. Explain how plants work and grow with the help of the mind map.
2. Make a poster to show how to protect plants.

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