What is the function of a lenticel? How are intercellular spaces important ?

Write a 1,000- to 1,500-word paper, including the pictures requested below, describing primary and secondary growth in plants and the journey of water and sugar molecules in plants. Include the following points and principles:

Primary and Secondary Cells and Tissues in Plants

  • The three types of plant cells are parenchyma, collenchyma, and sclerenchyma. For each, discuss the basic structure, function, the different types for parenchyma and sclerenchyma, and where in the plant they can be found.
  • Include a picture of a cross section of a stem. Label the following structures and then describe each of the following: epidermis, cutin, cuticle, guard cells, stomata, cortex, and vascular bundles.
  • What is the function of a lenticel? How are intercellular spaces important for this function?
  • Include a picture of a stem and label the nodes, internodes, apical meristems, leaf buds, and flower buds.
  • Describe growth by apical meristems.
  • Include a picture of a cross section of secondary growth in a woody species. Label the primary xylem and phloem, secondary xylem and phloem, fascicular cambium, and interfascicular cambium.
  • In woody species, additional tissues are produced in the stem and root by two additional meristems. Name these meristems, and describe how they add secondary growth to the plant.

Water, Sugar, and Mineral Transport in Plants

  • Explain how each of the following mechanisms transports substances within the plant: symplast, osmosis, molecular pumps in the membranes, transport vesicles fusing with the plasma membrane, apoplast, and transfer cells.
  • Describe the costs and benefits of transpiration for plants.
  • Describe how glucose (sugar) is transported within a plant. Use the terms sieve cellssieve tube memberscompanion cellssieve poressieve areaspressure flow hypothesissources (provide examples), sinks (provide examples), STM/CC complex, and osmotic potential in your response. Highlight these terms within your answer.
  • Explain how water and minerals are absorbed and transported by the root system into the xylem and from the xylem into leaves. Include the terms xylemtracheidsvessel elementspit membranesvessel, adhesioncohesioncohesion-tension, and transpiration. Highlight these terms within your answer.

Format your paper consistent with APA guidelines.


Part Two –

Present a 3- to 5-slide Microsoft® PowerPoint® presentation outlining the process of light reaction in photosynthesis.


  • For Local Campus students, these are 3- to 5-minute oral presentations accompanied by Microsoft® PowerPoint® presentations.
  • For Online and Directed Study students, these are Microsoft® PowerPoint® presentations with notes.
  • Present anatomical features and organelles needed to carry out photosynthesis (guard cells, stomata, and parenchyma cells, inner and out membrane of the chloroplast, stroma, grana, and thylakoid).
  • Provide a diagram that explains the major steps in the light reactions of photosynthesis. What are some ingredients and products of the light reactions of photosynthesis? Describe how these reactions take place, step-by-step.
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