外研版（2019）选择性必修第一册Unit 5 Revealing nature Understanding ideas 课件(23张PPT）

(共23张PPT)
SB1U5 Revealing nature
A Journey of Discovery
(Starting out & Understanding ideas)
Starting out
Activity 1
Look at the page from a science magazine and answer the questions.
What do you know about these animals What makes them special
What other similar animals do you know about Share your knowledge with the class.
Komodo dragon: It evolved in Australia and spread westward …
Duck-billed platypus: The oldest discovered fossil of it dates back to about 100,000 years ago …
Nautilus: It often considered “living fossils” …
They are all species that exit thousands of years on earth; They are old and rare (unusual).
Starting out
Activity 2
Watch the video and answer the questions.
How can seeds travel How can this benefit plants
Can you think of another example of seeds travelling Share it with the class.
Seeds usually are carried by the wind, water, and animals.
Plants can have a better chance at life.
Dandelion seeds have little parachutes to catch the wind and go further.
Humans can spread seeds if seeds get stuck to their clothing or shoes.
Understanding ideas
A Journey of Discovery
Lead in
An evolutionary tree
lower forms of life
higher forms of life
evolve---evolution
What species do you recognise in the picture
What factors can cause the process of evolution
Paramecium, earthworm, snail, crab, fish, tortoise, bird, horse, human, frog...;
alga, moss, fern, plant...
The ever-changing environment of nature;
environmental changes;
population immigration;
genetic mutation;
cultural preferences...
Who made this discovery
What is the discovery
How did he make the discovery
Charles Robert Darwin
The theory of evolution
The Origin of Species
Pre-reading
Choose the main idea of the passage and give your reasons.
Darwin’s interest in various living things made him a great naturalist.
Darwin’s journey on the Beagle inspired his Theory of Evolution.
Darwin went on a journey to confirm his theory that humans had evolved over time.
Pre-reading
While-reading
Read for structure
How he made the discovery.
Para.1
Para.2
Para.3
Para.4
Para.5
Para.6
Para.7
Introduction
On his journey
Generate ideas
Look for more evidence
Develop ideas
Propose a theory
Conclusion
Writing purpose: Set the suspense to attract reader’s interests
and form a strong contrast.
He was not the captain’s first choice.
He was a disgrace to himself and all his family
He was a young man who had left medical school without completing his degree.
While-reading
Read for details
Read Para.1 and choose the correct answer.
1. What is the function of para. 1
To praise Charles Darwin
To arouse readers’ interests
To introduce Charles Darwin’s achievements
To inform readers of Charles Darwin’s life
Which of the following statements about Charles Darwin is True
Darwin wanted to benefit from visiting little-known countries
Darwin quitted medical school due to his lack of money
Darwin’s father was satisfied with Darwin
Darwin’s made a significant scientific discovery thanks to his adventures on the ship Beagle
Charles Darwin was a geologist and naturalist, fascinated by rocks, plants and animals.
How did different species come to exist
While-reading
All species had appeared on Earth at the same time, and had not changed since
Animals evolved as they adapted to their changing environments
To look for more evidence
While-reading
Darwin noticed finches’ beaks had evolved according to what food was available on that particular island.
New species of plants and animals evolved from earlier ancestors.
While-reading
A theory of evolution
Darwin explained this theory in his book, On the Origin of Species.
On the Origin of Species is regarded as one of the most important works ever written. It has changed ideas about life on Earth forever.
Many people refused to believe. They were shocked. Later, more and more people started to believe his theory.
While-reading
While-reading
Read for consolidation
1
2
3
4
5
samples of the plants and animals
very similar to each other.
come to exist
Maybe animals evolved as they adapted to their changing environments
there was a difference between the finches on each of the islands.
had evolved according to what food was available on that particular island
had evolved from a common ancestor.
arrived on the islands a long time before
had evolved from lower forms of life
Post-reading
Summarize & Retelling
1
2--5
The text is organized in order of ______ .
Para. ___
Para. _____
Para. 6-7
time
Before
the journey
During
the journey
Post-reading
Summarize & Retelling
After
the journey
asked himself a question
(generated an idea)
answered the question (developed an idea)
published the book
(proposed a theory)
started his journey
In 1831
In 1835
In 1859
Post-reading
Retelling
Post-reading
Watch and Reflect
What kind of person was Darwin according to the passage
What have you learnt about the spirit of scientific exploration
I can succeed in science, the most important thing is the love of science and insisting on long-term exploration.
---Charles Robert Darwin
Darwin’s scientific spirit
Thank you!