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Parts of a Leaf Worksheet document sample
IDENTIFICATION INSTRUCTOR: Karee Wright UNIT TOPIC: Anatomy of Plants LESSON TITLE: Identification of Leaves CLASS: Intro. To Horticulture BEST DATE TAUGHT: Fall Semester TEKS: 119.2.c3b OBJECTIVES (TSWBAT---The student will be able to…) Define the parts of a leaf, the types of leaves, and how leaves are veined with 100% accuracy Identify the functions of a leaf with 100% accuracy Label the parts of a Leaf on a worksheet with 80% accuracy. Compare the types, parts, and veins of leaves on a quiz with 70% accuracy TEACHING MATERIALS AND RESOURCES (What do you need to bring?) Note Sheets Worksheet Quizzes Chalk/Dry Erase Board Chalk/Dry Erase Markers TEACHING PROCEDURES---Preparation, Presentation, Application, Evaluation Preparation (Interest Approach/Motivator) Key Points Methods Link: TLD Yesterday we talked about the stem of a plant. Can anyone tell me what he or she can remember from our discussion from yesterday? Motivation: The leaf is like a solar panel; it brings energy to the plant. Can anyone think of any other examples of what a leaf is like? Pass out the note handout so the students Today: we are going to discuss the two types of leaves can fill them out during and the parts in each kind. We are also going to see the class. how leaves can be arranged on a stem and the some functions that the leaves have. Presentation (The Meat!) Key Points Methods We are going to start out the day by defining the two Ask the students if they types of leaves (simple and compound), the parts in know of any the parts of each kind of leaf, and some functions of the leaf. the leaves and what the definition is? Types of Leaves: Simple Leaf: consists of one single blade and a petiole. Compound Leaf: consists of a petiole and two or more leaf blades called leaflets. Parts in the Leaf: Simple Leaf: -Blade: the flattened, green, expanded portion of a leaf. -Margin: edge of a leaf. -Midrib: largest vein in the center of the leaf which may have smaller lateral veins branching from it. -Lateral Veins: secondary veins in a leaf. -Leaf Apex: the tip of the leaf. -Leaf Base: the part of the blade that is attached to the petiole. -Petiole: the leaf stalk (connects the blade to the stem). -Stipules: leaf-like appendages (at the base of the petiole). Compound Leaf: -Leaflet: secondary leaf of a compound leaf. -Rachis: an extension of the petiole bearing leaflets. -Petiolule: stalk of a leaflet. -Petiole: the leaf stalk. -Bud: an underdeveloped shoot enclosed by bud- scales. Leaf Arrangement: -Alternate: one leaf per node, usually staggered along stem, like a spiral. -Opposite: two leaves (a pair) per node, usually opposite each other. -Whorled: three or more leaves per node, usually equally spaced around the node. Functions of the Leaves: Photosynthesis: the site where it primarily occurs Storage: ex. Aloe Vera Support: ex. Tendrils on a grape vine Protection: ex. Spines on cacti Attraction: ex. Bracts on a Poinsettia or a Dogwood Vein Arrangement: Pinnate: feather-like In the Simple Leaf you Palmate: finger-like (no midrib) have all three kinds of Parallel: principal veins parallel to the axis of the leaf. vein arrangements and Compound Leaves are only Pinnate and Palmate. Application (What will they do with what you taught?) Key Points Methods Application 1: Have the students fill out the notes sheet while you talk about leaves. Application 2: Have the students label the parts of the leaf on a Pass out the worksheet worksheet. and give the students about 5-10 minutes to finish it. Evaluation (How do you know they learned it?) Key Points Methods Quiz: Pass out the quiz to each Have the students take a quiz about the types of student. leaves, the parts of a leaf, the function of leaves, and the arrangement of the veins. Today: we discussed the leaf, can anyone tell me why Summary of what was he or she think the leaf is important part of a covered today in class. plant. Tomorrow: we will discuss the final part of the plant. TLD The part that you notice first when you look at a plant, the flower. Start thinking of how many parts of the flower you can name and what they mean. REFERENCES: General Horticulture Laboratory Manual 2nd Edition.David Wm. Reed.1993. Introduction to Horticulture 3rd Edition.Schoeder, Seagle, Felton, Ruter, Kelley, Krewer.2000.
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