1、2021/8/11 星期三1Reading on P782021/8/11 星期三2CoEvolution yucca 絲蘭2021/8/11 星期三3yucca moth 2021/8/11 星期三4 The Travellers Palm 棕櫚樹2021/8/11 星期三5The Madagascar black lemur2021/8/11 星期三6The Ophrys Orchid 蘭花2021/8/11 星期三7wasp2021/8/11 星期三8Warming up Discuss the question:Whats the relationship betweenplants

2、and animals?2021/8/11 星期三9Pre-reading Before you read the text, glance quickly through it and answer these questions. 1. Whats the topic of the text? 2. What three plants are featured? 3. What do the photos show you? 4. What three animal pollinators are featured?2021/8/11 星期三10Whats the topic of the

3、 text?2. What three plants are featured?Co-evolution. The yucca, the Travellers Palm, and the Ophrys orchid.2021/8/11 星期三113. What do the photos show you?4. What three animal pollinators are featured?Yucca flowers, a Travellers Palm,and an Ophrys orchid. The yucca moth, the Madagascar black lemur, a

4、 certain kind of wasp(the male, not the female wasp).2021/8/11 星期三12First reading Now read the text more carefully and answer these questions.Why can no other animals but the yucca moth pollinate the yucca? Its only the yucca moth which is the right size and shape to pollinate the yucca.2021/8/11 星期

5、三132.Can you guess why the Travellers Palm has that name? The Travellers Palm has this namebecause travellers used to drink its nectar when they were thirsty.2021/8/11 星期三143. What do you think “sweet tooth” means? If a person or an animal has a “sweet tooth”, they like sweet food very much.2021/8/1

6、1 星期三154. Why do the male wasps try to mate with the orchid flowers? The male wasps try to mate with the orchid flowers because they look like and smell like female wasps. 2021/8/11 星期三165. Why do the female wasps visit the orchid flowers? Do they have a role in pollination? The female wasps visit t

7、he orchid flowers to collect the chemical that the male wasps were attracted to earlier. The female wasps do not have a role in pollination since the flowers are dying when they visit them.2021/8/11 星期三17Second reading Now read and think about the advantages and disadvantages of the relationships be

8、tween the plants and pollinations described in the text. Check your understanding and complete the table.2021/8/11 星期三18Plant/pollinatorAdvantagesDisadvantagesYuccaMothThe yucca is certain to be pollinated.The moths caterpillars have a certain supply of foodThey are totally dependent on each other f

9、or survival.2021/8/11 星期三19Plant/pollinatorAdvantagesDisadvantagesTravellerspalmLemur The palms flower can be opened by the lemur.The lemur has a source of food.There is a disadvantage for the palm only if there are no lemurs or other animals present strong enough to open the flowers.2021/8/11 星期三20

10、Plant/pollinatorAdvantagesDisadvantagesOrchidWasp The orchid is certain to be pollinated.They are totally dependent on each other for survival.The female wasps collect a chemical from the orchid needed to attract the males to them.2021/8/11 星期三21Discussion Discuss what you think would happen to the

11、animal pollinators of each of the plants described if these plants died out.2021/8/11 星期三22Suggested answers:The yucca and the yucca moth: If yucca plants died out, theYucca moth would also die out as the caterpillars need the yucca seeds for food.2021/8/11 星期三23 The Travellers palm and theMadagascar black lemur: If the Travellers palm died out, the Madagascar black lemur would not die out as it can find other sources of food.2021/8/11 星期三24 The Ophrys o