3. Diagram a cladogram showing the evolutionary relationships among the four main groups of living plants.
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1 OBJECTIVE SHEET PLANTS Phylum: Coniferophyta (gymnosperms the conifers) Phylum: Anthophyta (angiosperms the flowering plants) 1. Explain the alternation of generations in the two-phase life cycle of all plants. 2. Explain four requirements that all plants need in order to survive. 3. Diagram a cladogram showing the evolutionary relationships among the four main groups of living plants. 4. Explain three adaptations that seed plants have derived that allow them to reproduce without water. 5. List the characteristics of conifers. Name three gymnosperms common to our ecosystem. 6. Use a dichotomous key to identify the following trees: lodgepole pine, ponderosa pine, douglas fir, spruce, red cedar, and rocky mountain juniper. 7. List the characteristics of angiosperms and identify three ways that angiosperms are categorized. 8. Explain the adaptations for seed dispersal that angiosperms have over gymnosperms. 9. List 5 ways of distinguishing between monocots and dicots. 10. Diagram a cross-section of a monocot stem to include the epidermis, cortex, xylem and phloem. 11. Diagram a dicot stem that is undergoing secondary growth to indicate the following: bark/periderm, cork cambium, vascular cambium, secondary xylem and phloem, growth rings, pith and cortex. 12. State the function of xylem, phloem, meristems, periderm and cells in the cortex by identifying three types of plant tissue: Dermal tissue, Vascular tissue, and Ground tissue. 13. Contrast the structure of a Ranunculus buttercup root with a typical Pinus stem. 14. List the layers seen in the cross-section of a leaf. 15. Explain how leaves are modified to live in a hot dry climate. 1
2 16. Explain Alternation of Generations in gymnosperms by discussing the gymnosperm life-cycle. 17. Identify the structures in a typical flower. Include the anther, filament, stamen, stigma, style, ovary, carpal (pistil), sepal, petal, ovule, pollen, pollen tube, sperm nuclei, egg nuclei and polar nuclei. 18. Explain what occurs in double fertilization of angiosperms. Include the unique formation of a triploid cell in the formation of endosperm for the developing embryo. 2
3 Kingdom Plantae Plants dominate the landscape. Where plants are plentiful, other organisms such as animals, fungi, and microorganisms take hold and thrive. Plants provide the base for food chains on land. They also provide shade, shelter, and oxygen for animals of every size and kind. Plants are defined as 1. Draw a diagram of the Plant Life Cycle below: The generation of a plant that is diploid (2N) is called the and the generation of a plant that is haploid (N) is the The gametophyte produces and while the sporophyte produces. 2. Living on land requires special needs of all plants. These include: a) b) c) d) 3
4 3. Draw a cladogram below showing the evolutionary relationships among the four main groups of living plants. Mosses and their relatives lack that all other plants have. The group of plants that do not have seeds include. The seeds of flowering plants differ from the seeds of cone-bearing plants because flowering plants have seeds. 4. Seed plants have been divided into two main groups: the group that bears their seeds directly on the surfaces of cones are called and the that bear their seeds within a layer of tissue that protects the seed. Mosses and ferns are not as complex as the seed plants. Unlike mosses and ferns, seed plants do not require water for fertilization of gametes. Because of this method of development, seed plants can live just about anywhere from moist habitats that are often dominated by the seedless plants, to dry and cold habitats where most seedless plants cannot survive. 4
5 All seed plants have three main adaptations that allow them to survive and reproduce free from water. Adaptations that allow seed plants to reproduce without water include: 5. The word gymnosperm means The seed-bearing structures of gymnosperms are called By far the most common gymnosperm are the Three common members of this phylum to this area include 6. The leaves of conifers have specific adaptations to dry conditions and limited sunlight. The development of long, thin needles aids in several ways. This includes: 7. The name angiosperm means What is a flower? Why do angiosperms have a reproductive advantage over gymnosperms? 5
6 The diversity of angiosperms is divided into three categories (that can overlap) that simply provide a way of organizing this varied group of plants. These include: 8. Fill in the following to explain the differences between Monocots and Dicots: (you do not need to draw pictures) SEEDS MONOCOTS DICOTS LEAVES FLOWERS STEMS ROOTS In monocots, are scattered throughout the stem. In dicots and most gymnosperms, vascular bundles are arranged in a cylinder. These vascular bundles contain vascular tissue. Plants are able to carry water and nutrients to all parts of the plant through the use of vascular tissue. Xylem cells are designed to transport water to all parts of the plant while cells that carry nutrients such as sugar are called Phloem cells. 9. Obtain a microscope for you and a partner to work with. Obtain the slide called MONOCOT & DICOT STEMS c.s. On the next page, diagram a simplified cross section. Label the epidermis, vascular bundles (include xylem, phloem), ground tissue, cortex and pith. Note that in dicot stems the vascular bundles are arranged in a ring whereas the bundles in monocots are scattered throughout the stem. Diagram a single vascular bundle showing xylem and phloem (blue band) 6
7 References include: Your text pg Botany text pg. 144, 145, 146, 147 Label on each stem: epidermis, vascular bundles, ground tissue, cortex and pith. Monocot stem Dicot stem Vascular bundle (label xylem + phloem) 7
8 Read the reference pages 579 from your text on seed plant structures as well as the 3 main tissue systems on reference pages Unlike animals where growth occurs all over the body, plants only grow at the stem, branch, and root tips. The tissues present in those areas are called meristems. Apical meristems are found in the end of stems, roots and branches. The meristematic tissues that make up these areas are made up of unspecialized or undifferentiated cells that give rise to new cells by mitosis. Once these cells are made, they differentiate into specialized cells that can do specific functions. For their entire life, new cells are produced at the tip of the roots and shoots. This method of growth, occurring only at the ends of a plant, is called primary growth. This increases the length of a plant from year to year. Look at the Coleus Leaf Tip slide to observe both apical and lateral meristem tissue. SECONDARY GROWTH IN DICOTYLEDONOUS STEMS If a plant is to grow taller and larger each year, its stem must increase in thickness as well as length. The method of growth in which stems increase in width is called secondary growth. Two other kinds of meristems are found inside stems that perform this; they are cork cambium and the vascular cambium. The vascular cambium becomes continuous between the vascular bundles. On the outside, it produces secondary phloem. The outermost phloem is crushed and does not form growth rings. Towards the inside of the stem, the vascular cambium produces 6 to 8 times as much secondary xylem as it does phloem. Thus the tree becomes more and more made of xylem (wood). The innermost xylem becomes plugged with resins and stops functioning and is now called heartwood. The outer still functioning xylem is called sapwood. 8
9 The spring xylem cells (C) are larger than the late summer xylem cells due to the difference in amounts of water available. The small late summer cells (D) are seen by your eye as a dark ring. The width of a lighter area and a dark ring is one year s growth. The width of one year s growth gives an indication of the growing conditions that were present during that year. (structures C and D below) 9
10 A tree can be killed by girdling, which is the cutting of the phloem around the circumference of a tree. This stops the sugar from the leaves from reaching the roots which causes the roots, and thus the whole tree to die. In woody stems, a layer of meristematic cells in the cortex becomes active ( the cork cambium) and makes a waterproof layer of cork, commonly called bark or periderm. As the tree grows, bark from underneath replaces old bark. 11. After reading text pgs on Secondary Growth of Stems, Obtain a slide called PINUS- Older stem c.s., or use the slide called MEDICAGO stem and diagram a pie-shaped section of the stem and label: bark/periderm, cork cambium, vascular cambium, secondary xylem and phloem, growth rings, pith, and cortex. Reference pgs. Botany text pgs PINUS Older stem c.s. 10
11 Tilia (Basswood) Stem Label the following structures on the diagram of a stem below: Cork, cork cambium, cortex region, secondary phloem, vascular cambium, secondary xylem, fall xylem, spring xylem, 1 year s growth, pith 11
12 12. Copy the diagram of a RANUNCULUS (BUTTERCUP) root, c.s. from the white board. Obtain a slide of this from the front and identify the xylem in the centre. Identify the structures, xylem, phloem, cortex, starch, epidermis and endodermis. 12
13 13. Obtain a slide of Ligustrum leaf, x.s. or Pelargonium leaf, x.s.. You need not draw it. Compare the actual appearance under the microscope to the diagram below. Be able to identify the various layers. What is the purpose of the holes in the leaf? Note that guard cells have chloroplasts. What is the function of the vein? _ Use this drawing to compare each structure to what you see in the slide of the leaf. Identify all of the structures for the plant exam. 13
14 Ligustrum leaf x.s. Label as many structures and layers as you can and check up front. Reference : your text pg Obtain a slide of Sedum epidermis. You are looking at a leaf viewed from the bottom surface called the lower epidermis. Note the stoma surrounded by guard cells. Sketch and label what you see below. The guard cells are the only cells on the lower epidermis that contain chloroplasts. 14
15 15. Label the Flower after you have read the definitions: anther - the tip of a flower s stamen ( the male reproductive organ) the anther contains pollen filament - the stem of the anther (holds the anther) ovary petal sepal - produces ovules. It is at the base of the pistil (the female reproductive organ - brightly coloured leafy structure that attracts insects - small leaves located under the flower stigma - the uppermost part of the pistil. It receives pollen grains during pollination, when they travel through the style to the ovary. Style - the sticky top part of the pistil directly above the ovary. 15
16 Make sure that you have seen the model up front explaining double fertilization. Diagram the model below. Include the following terms: pollen, pollen tube, sperm nuclei, ovary, ovule, egg cell, and polar nuclei. Refer to page 614 in the text. Read about double fertilization on page 616. Diagram a seed as shown on page 616 of text and label the following parts: seed coat, endosperm, and embryo. 16
17 Plant Lab Exam Checklist Monocot stem Dicot stem Chloroplast Cortex Vascular bundle Double fertilization Primary xylem Primary phloem Seed coat Secondary xylem Secondary phloem Endosperm Vascular cambium Apical meristem Pith Lower epidermis Palisade layer Guard cells Vein Fall xylem Cotyledon Periderm (bark) Seed Ovary Stigma Filament Petal (corolla) Embryo Heartwood Polar nuclei Cork cambium Sapwood Upper epidermis Waxy cuticle Spongy mesophyll Stoma(ta) Spring xylem Growth ring Anther Stamen pistil Ovule Style Sepal Pollen Pollen tube Sperm nuclei Egg cell 17
18 18
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