Posted: November 11th, 2015

Process Of Light Reaction

Process Of Light Reaction

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

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

cells, sieve tube members, companion cells, sieve pores, sieve areas, pressure flow

hypothesis, sources (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 xylem, tracheids,

vessel elements, pit membranes, vessel, adhesion, cohesion, cohesion-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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