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Plant Unit Dates: April 3 - April 27 Chapters: 17 - 19 Assignments: Plant Tissues - Lab 14 Worksheet - Roots Worksheet - Stems Worksheet - Leaves Investigation 15 - Flowering plants Investigation 16 - Fruit, Seeds, and Seedlings Investigation 17 - Regulation of Growth in Plants Evaluation: April April April April April April 10 13 18 20 24 27 - Root Quiz Stem Quiz Leaf Quiz Flower Quiz Seed Quiz Plant Test At the conclusion of this section of the plant unit, the student should be able to: 1. describe the different plant tissues and how they function. 2. explain the function of roots and stems. 3. point out the difference between a fibrous and a taproot. 4. explain the importance of root hairs in the absorption of water and nutrients from the soil. 5. show how roots and vascular tissues contribute to a redwood tree's great size. 6. explain the difference between summerwood and springwood; sapwood. heartwood and 7. use their knowledge of vascular tissue, explain why making a cut through the bark of a tree in a complete circle around the trunk often results in the death of the tree. 8. compare simple leaves and compound leaves and explain how these shapes related to solar energy collecting. 9. explain how a certain leaf modification may help adapt the organism to different environmental conditions. (i.e. the modified thorns of a cactus).. 10. discuss how the internal structures of the leaf enables it to carry out its function 11. explain the adaptive advantages for loss of leaves by trees and shrubs in the winter. 12. give the location and function of the following flower parts: sepals, petals, stigma, anther, and ovary. 13. describe the pollination process from stamen to pistil. 14. explain how the color and shape of the plant’s flowers explain its method of pollination. 15. explain the formation of a pollen tube and how fertilization takes place. What is double fertilization? 16. describe two ways plants reproduce vegetatively in nature. 1. describe the parts of a typical seed. 17. explain the advantage for seeds to have a starchy endosperm as opposed to a sugary endosperm. 18. describe seed germination up to the period in which the leaves are formed. 19. explain how seed plants are better able to survive drier conditions than mosses and ferns. 20. explain what a plant tropism is and give an example of both a positive and a negative tropism for a stem. For a root. 21. explain the role of auxin in making a plant grow toward a light source. Vocabulary: dormancy angiosperm annual herbaceous zone of elongation stoma palisade layer girdling hypocotyl hototropism hydrotropism tube nucleus embryo dicot biennial lateral bud zone of maturation guard cells spongy mesophyll pollination epicotyl gravitropism polar nuclei generative nucleus gymnosperm monocot perennial seed coat petiole mesophyll transpiration cotyledon radicle thigmotropism egg nucleus sperm nucleus Extra Credit: 1. If you were weeding a lawn, would you be more successful at removing weeds with a taproot or weeds with fibrous roots? Explain your answer. 2. When transplanting a plant, it is important not to remove any more soil than necessary from around the roots. From your knowledge of the function of roots and root hairs, why is this so important? 3. A farmer decides not to plant his fields one year. Later in the year heavier than normal rains fall on the field. Now the farmer wishes he had planted his crops. Why do you think he changed his mind? 4. A student notices that leaves at the very top of a shrub are relatively small and thick. Leaves lower down on the shrub are broader and thinner. Develop a hypothesis to account for the two types of leaves. 5. Suppose you were going on vacation and you couldn't find anyone to water your houseplants. You knew that plants lose water through the stomata in their leaves, so you decide to cover the leaves with petroleum jelly to prevent water loss. When you returned home, would you expect to find your plants dead or alive? What is the most logical explanation for what may happen?