Green world教案
step ⅲ fast-reading
t:you’ve learnt something about carl linnaeus,daniel solander and joseph banks in the text we’ve just studied.and you’ve read about michurin and darwin.today,we’ll learn about another two scientists gregor mendel and gote turesson.what did they do?what contribution did they make?after we’ve learnt the passage,i’ll sure you’ll have a clear idea.(show the following on the screen.)now read the text fast and try to grasp the main idea of the text as much as possible.then find answers to the questions on the screen.
answer the following questions:
1.what was charles darwin’s hobby when he was young?
2.what led darwin to write his famous book “on the origin of species”?
3.who founded the science of genetics?
4.who made contribution to the improvement of the output of crops according to the text?
(students begin to read the text.after a few minutes,teacher says the following.)
t:have you finished?
ss:yes,we have.
t:now give us the answers,please.one student,one question.
sb:1.when he was young,darwin enjoyed doing all kinds of experiments and studying physics,chemistry and later botany was his hobby.
sc:2.when he was twenty-two years old,he was invited to take part in the scientific expedition on the beagle.his observation on the five-year voyage led him to write his famous book.on the origin of species.
s d:it was the research work of mendel that gave birth to the science of genetics.
s e:mendel’s genetics and turesson’s findings are both important to the output of crops.
t:what you said is right.thank you for giving us such good answers.
step ⅳ reading and comprehension
t:(show the following on the screen.)now let’s read the text again and discuss the questions on the screen.pair work or group work.
1.the research of charles darwin,gregor mendel and gote turesson is like pieces in a puzzle that show a complete picture when put together.
(1)what did darwin discover about bird species in galapagos?
(2)what did mendel observe in his experiments with peas?
(3)looking at wild plant species in sweden,what did turesson discover?
2.complete the following sentence.
darwin’s discoveries in galapagos were based on differences_________wild species,while turesson’s observations showed that there are stable varieties _________wild species.
3.that soil conditions are important to the output of crops was known more than years ago.why are turesson’s discoveries still important to agriculture then?
(teacher goes among the students and joins the students in their discussion.)