人新課標選修9課件優(yōu)秀備選warming up

1、Unit 4 Exploring PlantsLearning diversity of plantsWarming-up What do you know about plants? Answer the following questions. Then in groups, see how much you know about the plants mentioned in the questions. Give examples of particular plants if you can.Warming-up1.Some plants do not have flowers? S

2、ome plants do not have flowers, for example pine trees, cypress tree(柏木屬植物), ferns(蕨類植物), mushrooms. With these plants, the seeds are not contained inside a fruit. Flowering plants have seeds that are contained inside fruit.2. Some plants have roots that live in the air? Some plants have roots that

3、live in the air. For example, mangrove(紅樹林）trees live in wet conditions and have roots that grow up from the mud into the air to absorb oxygen (See Picture A, mangrove tree). Other plants that have aerial roots are plants such as some ferns, some orchids and climbers in rainforests that use their ro

4、ots to attach themselves to other plants. Their roots not only attach the plant to the tree but also absorb water from the air (Picture D, the birds nest fern)3. Some plants eat meat? Some plants eats meat. They get their food from animals trapping insects that land on them, killing them and then di

5、gesting their bodies with chemicals. Picture B shows an insect-eating plant called a Venus flytrap. When the hairs on the leaves are touched by an insect, the two parts or the leaf snap together and trap the victim.4. Some plants need animals to pollinate them? Some plants need animals to pollinate

6、them. They have developed flowers with different characteristics to attract particular animal pollinators such as bees, flies, butterflies, birds, bats, beetles, and moths. Plants that do not have flowers need other ways of making sure that they are pollinated, for example, corn, grasses and many tr

7、ees depend on the wind or water to transport pollen from one plant to another.5. Some plants grow on other plants? Some plants grow on other plants. They use their roots to attach themselves to another plant. Some use their roots to absorb water from the air (Picture D). Plants like this are differe

8、nt from parasitic(寄生的）plants that actually live on another plant and get their food from the host.6. Plants are adapted to live in specific environment? Plants are adapted to living in specific environments. For example, plants that live in the tropics are adapted to living in a hot wet climate. Pic

9、ture C shows palms that live in tropical climates. Plants that are used to cold conditions cannot necessarily live in hot conditions.7. People buy plants that come from other countries for their gardens? People buy plants that come from other countries for their gardens. People tend not to think abo

10、ut where the plants in their pots or gardens come from. In fact, many come from other countries, for example tulips from southern Europe and Turkey, carnations from southern Europe and Greece, evening primroses(櫻草花，報春花）from North America, daffodils(水仙花）from the Mediterranean area, Crane flower from

11、South Africa, daisies and violets(紫羅蘭）from Europe, etc.8. A new plant does not always grow from a seed? A new plant does not always grow from a seed. New plants often grow from underground roots or stems, for example, the bamboo makes new plants by sending up new shoots form underground stems. Straw

12、berry plants and many grasses and some ferns send out stems that run along the top or the ground and new plants grow along these stems. Other plants, like the daffodil, make new plants from bulbs. New plants can also grow from stems that have been cut from a plant.Do you have a courtyard garden or s

13、ome pot plants on yourbalcony? Do you know where these plants come from? Arethey Chinese plants or do they come from another country?ABCDpotted plantspot plants on balconiesa courtyard gardena courtyard gardena courtyard garden When you last visited a public garden, did you look at the individual plants there? Were there any plants from other countries?How do you think plants have travelled from one country to another?Discussion我國珍稀植物221.194.23.252/CZ05-06-01/XK