优秀备选课件Reading1章节幻灯片.pptVIP

* Exploring Plants * Warming-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--up 1.Some plants do not have flowers? Some plants do not have flowers, for example pine trees, cypress tree(柏木属植物), ferns(蕨类植物), 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 live in the air. For example, mangrove(红树林）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 roots 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 bird’s 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 digesting 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 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 trees 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 them