高中英语人教版 (新课标)选修9&10Unit 4 Exploring planets评课ppt课件

这是一份高中英语人教版 (新课标)选修9&10Unit 4 Exploring planets评课ppt课件，共24页。PPT课件主要包含了Warming Up，yucca 丝兰，wasp等内容，欢迎下载使用。

Discuss the questin:What’s the relatinship betweenplants and animals?
C–Evlutin
The Traveller’s Palm 棕榈树
The Madagascar black lemur
The Ophrys Orchid 兰花
1. What’s the tpic f the text? 2. What three plants are featured? 3. What d the phts shw yu? 4. What three animal pllinatrs are featured?
Pre-reading
Befre yu read the text, glance quicklythrugh it and answer these questins.
What’s the tpic f the text?
2. What three plants are featured?
The yucca, the Traveller’s Palm, and the Ophrys rchid.
3. What d the phts shw yu?
4. What three animal pllinatrs are featured?
Yucca flwers, a Traveller’s Palm,and an Ophrys rchid.
The yucca mth, the Madagascarblack lemur, a certain kind f wasp(the male, nt the female wasp).
First reading
Nw read the text mre carefully and answer these questins.
Why can n ther animals but the yucca mth pllinate the yucca?
It’s nly the yucca mth which is the right size and shape t pllinate the yucca.
2. Can yu guess why the Traveller’s Palm has that name?
The Traveller’s Palm has this namebecause travellers used t drink its nectar when they were thirsty.
3. What d yu think “sweet tth” means?
If a persn r an animal has a “sweet tth”, they like sweet fd very much.
4. Why d the male wasps try t mate with the rchid flwers?
The male wasps try t mate withthe rchid flwers because they lk like and smell like female wasps.
5. Why d the female wasps visit the rchid flwers? D they have a rle in pllinatin?
The female wasps visit the rchid flwers t cllect the chemical that the male wasps were attracted t earlier. The female wasps d nt have a rle in pllinatin since the flwers are dying when they visit them.
Secnd reading
Nw read and think abut the advantages and disadvantages f the relatinships between the plants and pllinatins described in the text. Check yur understanding and cmplete the table.
The yucca is certain t be pllinated.The mth’s caterpillars have a certain supply f fd
They are ttally dependent n each ther fr survival.
The palm’s flwer can be pened by the lemur.The lemur has a surce f fd.
There is a disadvantage fr the palm nly if there are n lemurs r ther animals present strng enugh t pen the flwers.
The rchid is certain t be pllinated.
The female wasps cllect a chemical frm the rchid needed t attract the males t them.
Discuss what yu think wuld happen t the animal pllinatrsf each f the plants described if these plants died ut.
Suggested answers:
The yucca and the yucca mth:If yucca plants died ut, theYucca mth wuld als die ut as the caterpillars need the yucca seeds fr fd.
If the Traveller’s palm died ut, the Madagascar black lemur wuld nt die ut as it can find ther surces f fd.
The Traveller’s palm and theMadagascar black lemur:
The Ophrys rchid and the wasp: If the Ophrys rchid died ut, the wasp wuld als died ut as the female wasp needs the chemicalprduced by the rchid t attract the male wasps.