- - AGRICULTURE CORE CURRICULUM - -

(CLF6000) Advanced Core Cluster: ORNAMENTAL HORTICULTURE

 (CLF6250) Unit Title: SEXUAL AND ASEXUAL PROPAGATION

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 (CLF6253) Topic: PARTS OF THE FLOWER     Time              Year(s) 
                                           1 hours              3 / 4 
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         Topic Objectives: Upon completion of this lesson, the student
                            will be able to:

         Learning Outcome #:

           (D-3) - Identify the principal parts of a typical flower, 
                     including pistals, stamens, sepals, petals,
                     receptacle, calyx, and corolla, on an actual flower 
                     (not a diagram).

           (D-4) - Explain the difference between a complete and an 
                     incomplete flower.

         Special Materials and Equipment: Flowers,and hand lens, or
                     dieceting microscope.

         References: Ingels, J. ORNAMENTAL HORTICULTURE PRINCIPLES & 
                        PRACTICES Albany, NY. Delmar Publishers

         Evaluation: Quiz or test.

TOPIC PRESENTATION: PARTS OF THE FLOWER 

A. Flowers perform sexual reproduction.

   1. A flower is made up of five parts.

       a. The receptacle is the enlarged stem tip, to which other flower
           parts are attached.

       b. The sepals form an outer circleof leaf-like structures 
           collectively called the calyx. 

           1) They protect the flower bud and they may attract pollinating
              animals.

           2) Pollinators are animals that carry male reproductive cells.
               (in pollen grains) from flower to flower.

       c. The petals, collectively called the corolla, make up the 
           colorful parts of most flowers.

           1) They may secrete nectar ( a sugar solution) that rewards
               animal pollinators.

           2) They may secreate aromactic compounds that attract animals.

           3) Each species has characteristic numbers and shapes of flower
               parts. This uniformity helps to assure that pollinating
               animals will visit flowers of the same kind one after
               another.

       d. Stamens are the male parts of the flower.

           1) They are situated inside the petals.

           2) They consist of a filament (stalk) and a pollen bearing
               anther at its apex.

       e. Pistils are the female parts of the flower.

           1) They are located in the center of the flower.

           2) They have three parts:

               a) A stigma, (which captures pollen)

               b) A style, which leads from stigma to ovary.

               c) An ovary. the basal enlarged part in which seeds are 
                   formed.

B. A flower is said to be complete if it contains all of the primary parts.

C. If a flower is missing any of it's parts it is an incomplete flower.

D. If a flower is missing the stamen or pistil it is said to be imperfect.


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         ACTIVITY: 
 
         1. Provide flowers from at least four different plants.

         2. By using tweezers and razor blades, dissect the flowers 
             into their parts (receptacle sepals, petals, stamens and 
             pistils).

         3. Draw each of the four parts.

         4. Discuss and compare the differences between each of 
             the four parts.

         5. Draw one complete flower and label all of its parts.
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7/27/90 MT

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