- -  AGRICULTURE CORE CURRICULUM - -

(CLF6000) Advanced Core Cluster: ORNAMENTAL HORTICULTURE

   (CLF6200) Unit Title: PHYSIOLOGY AND GROWTH

                              UNIT DIRECTORY:

____________________________________________________________________________

       Code        Topic Title                         Hours    Year(s)
____________________________________________________________________________

      (CLF6201)    Growth Structures and Functions       9       3 / 4 

      (CLF6202)    Growth Patterns                       1       3 / 4 

      (CLF6203)    Growth Requirements                   3       3 / 4 

      (CLF6204)    Seedling Growth                       1       3 / 4 

                                   TOTAL TIME FOR UNIT = 14

____________________________________________________________________________

UNIT GOAL: Students will identify the basic principles of plant physiology
           and growth.

____________________________________________________________________________

UNIT OBJECTIVES: Upon completion of this unit, the students will be able 
                 to:

*****************************************************************************
Note to Instructor: This unit essentially duplicates Plant and Soil Science 
                    CLF7200.
*****************************************************************************

 1. Diagram and label the four primary plant structures (leaf, stem, root,
    and flower). Indicate the functions of each and list an example of 
    each.

 2. Explain the importance of meristematic tissue in growth and physiology,
    and in its relationship to plant reproduction. 

 3. Plant examples of monocotyledons (one seed-leaf) and dicotyledons 
    (two seed leaves) and assign students to make written observations of 
    the leaf and flower structures of each as they grow.

 4. Diagram the transpirational and translocational system of a plant and 
    describe the functions of each (e.g., cambium, xylem, and phloem). 

 5. Explain why knowledge of the translocational system of plants is 
    necessary for successful grafting. Girdle a tree and discuss
    observations with the class.

 6. Discuss the environmental factors affecting growth (e.g., light,
    temperature, soil, humidity, wind, mineral, elements, gases, and 
    support). Have students conduct plot tests to determine environmental
    effects on young plants.

 7. Make a collection of specialized roots, stems, and leaves (e.g., 
    stolons, rhizomes, bulbs, tubers) and discuss their differences and 
    similarities in class. 

 8. Sketch and label each of the following root types: carrot, potato,
    corn, and grass. Distinguish between roots and underground stems and 
    compare tap and fibrous root systems. 

 9. Discuss the function of the stomata and explain how water affects this 
    function. 

10. Define transpiration and discuss four environmental factors that affect
    the transpiration rate (e.g., wind, humidity, temperature, and
    insolation (exposure to sun)). 

11. Define the term "hormone" and describe how hormones are transported to
    target structures in plants (e.g., vascular tissue). 

12. Define translocation and its importance to the plant. 

13. List the requirements for seed germination and indicate factors that 
    might reduce germination rates (e.g., temperature, water, oxygen, seed 
    dormancy, and disease). 

14. Trace the stages of development (using bean, pea, onion, and corn
    plants) from germination to the stage of first true leaves. Compare 
    and contrast the types of growth. 

15. Describe the life cycle of a dicotyledonous plant from seed to seed 
    production. 

16. Discuss and give examples of the effects of photoperiodism on plant
    growth.

17. Sketch and name four types of leaf arrangement on a stem (e.g.,
    alternate, opposite, whorled, trifoliate). 

____________________________________________________________________________
REFERENCES:

Hartmann, H. T., Flocker, W. J., & Kofranek, A. M. (1981). PLANT SCIENCE:
 GROWTH, DEVELOPMENT, AND UTILIZATION OF CULTIVATED PLANTS. Englewood
 Cliffs, NJ: Prentice-Hall.
____________________________________________________________________________
RESOURCES:

Ag Access (agricultural book source). P.O. Box 2008, Davis, CA 95616
 (916) 756-7177. (Contact for catalog.)

Vocational Education Productions (VEP) (slides, videos, etc.). California 
 Polytechnic State University, San Luis Obispo, CA 93407. In California: 
 (805) 756-2295; outside California: 1-800-235-4146. (Contact for
 catalog.)

EISI (representatives for a variety of educational software publishers).
 225 Grant Road, Los Altos, CA 94024. In Calif.: (800) 748-6519; outside
 California: (800) 748-6519. (Contact for catalog.)



12/13/90 PK/sg


#%&C