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(共20张PPT)
高中英语外研版2019选择性必修第一册
Period 3 ：
Developing ideas & Presenting ideas
Unit 5
Revealing nature
Learning objectives
1. Students can keep in mind some useful expressions and understand some long sentences.
2. Students can speak out the process when plants use chemicals to communicate.
3. Develop students' interest in exploring the secrets of nature, enhance their awareness of protecting plants and the ecological environment, and cultivate cross - cultural thinking in scientific topics.
What the plants can do How
Lead in
Watch the video and answer the questions
What the plants can do How
Plants can travel/sow seeds播种.
Lead in
① by itself
Lead-in
Lead in
Now talk about what else you think the plants can do and give examples.
make medicine
protect environment
reduce noise
predict the solar terms
flytrap
捕蝇草
The can _______ insects.
Its leaves can _______ when touched.
mimosa [m m z ] 含羞草
fold up
catch
pea
豌豆、豆角
The can sow(播种) its own ________.
seeds
Look at the title and predict : plants can ________.
communicate
Plants can communicate with each other by using chemicals, sound and “wood wide web”.
How do plants communicate
--Plants can communicate by...
While-reading
The Secret Language of Plants
Plants can communicate .
Scientists are learning more about plants’ language.
Para 1~2
Para 3
Para 4
Para 5
Para 6
Using chemicals
Using sound
Using WWW
Narration(记叙文)
Exposition（说明文）
Argumentation（议论文）
Introduction
Body
Conclusion
Structure
Genre(文体)
Read for detailed information （para 1)
were said to have visited a talking tree in India.
trees can communicate with animals and people.
Talking plants have long been a thing of myths and legends.
With us long believing that talking plants are fantasy, new research has revealed something amazing: it appears that plants can communicate after all.
Read for detailed information (para 2)
scientific evidence
Read for detailed information (para 3)
Read and circle verbs describing the process of a bean plant saving itself.
It has been known for some time that plants use chemicals to communicate with each other. This happens when a plant, say a bean plant, gets attacked by insects. The plant releases tiny amounts of chemicals from the leaves that are being eaten. This is like a warning, or a call for help: “I’m being attacked!”When another bean plant detects the chemicals from its injured neighbour, it starts to release its own, different chemicals. Some of these chemicals drive insects away. Others attract insects—the wasps! The wasps kill the insects that are eating the bean plants. Scientists hope to learn more about this plant warning system, so that we can use it to grow crops without pesticides.
chemicals
a bean plant
insects
another bean plant
different
chemicals
wasp
attack
release
detect
release
kill
drive away
attract
kill
fill and try to retell
When being attacked by insects, a plant can save itself in an indirect way.
Read for detailed information (para 4)
para. 4 read and fill in the blanks
with their roots
tell if a
neighbouring plant is
helpful, or unfriendly
clicking noises
to indicate drought’s coming
chilli['t li]辣椒
clicking
[ kl k ]
咔嗒声
[dra t]旱灾；干旱
para. 5 read and answer
1.What is the ＂wood wide web＂
2. What can plants do by the ＂wood wide web＂
Read for detailed information (para 5)
The “wood wide web” is an amazing system of communications that can link nearly every plant in a forest.
* Plants can share information and even food with each other.
* Plants can steal food from each other or spread poisons to attack other plants.
Wood wide web
According to para 6, what is the writer’s attitude towards the scientific research on the secret language of plants
A. Positive B. Negative C. Neutral D. Indifferent
Scientists are learning more every day about the secret way in which plants talk to each other. Who knows Maybe one day we will know enough about plant communication to be able to “talk” with them ourselves.
Read for detailed information (para 6)
Is it beneficial(有益处的) to explore nature Why （Give a talk）
Think & Share
assignment
1.本课词汇听写准备。
2.单元检测卷（五）语法填空
Organise information from the passage and complete the diagram.
Using chemicals
* The plant releases chemicals ____________ that are being eaten.
* When another plant detects the chemicals, it starts to ______________
____________________.
from the leaves
release its own, different chemicals
Using sound
* Some plants make noises _____________________.
* A chilli plant can __________
__________________________
__________________________.
* Some trees make ___________
__________________________.
with their roots
tell if a
neighbouring plant is
helpful, or unfriendly
clicking noises
to indicate drought’s coming
Using the “wood wide web”
* This fungal network links _____ ____________________________.
* Plants can __________________
_____________ with each other.
* Plants can __________________
_____________________ to attack other plants.
the roots
of different plants to each other
share information
steal food from each other
Modern research is showing that plants can __________________________.
Maybe one day we will be able to “talk” with plants.
communicate with each other
and even food
or spread poisons

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