EAS391Chapter2 VanessaZimmer Photosynthesis Grade67
LessonExcerpt Photosynthesis is one of the most important natural processes that occur. It is also one of the hardest processes to understand. If you are not sure what exactly photosynthesis is do not be alarmed. Many people have an idea of what it is though they do not know what the process does specifically. In its most simple definition photosynthesis is the chemical process which changes chemicals and nutrients into food. This definition sums up the entire process nicely. However, the actual reaction that occurs is much harder to explain. Plants are not the only species that use photosynthesis. Algae and even various forms of bacteria use the process to convert chemical energy into food as well. Any species that uses photosynthesis to produce food is called a phototroph. The chemical energy is most often produced by sunlight. This is why sunlight is important to the survival of plant life. Water is also necessary for photosynthesis to occur. You probably already know that when you water a plant the water is absorbed through its roots. The water travels through the roots up long tubes that lead from the roots to other parts of the plant. These tubes are called xylem. As animals breathe in oxygen they release carbon dioxide into the air. The plants take in the carbon dioxide that has been exhaled. Essentially, they recycle the carbon dioxide, using it for the process of photosynthesis. A plant has tiny openings called stomata. Stomata are located in the leaves of the plant. Carbon dioxide is taken into the plant through these openings. Photosynthesis Grade Level: 6-7th Grade Science: Plant Structures and Processes Presented by: Linda Siebert, Lincoln Academy, Arvada, CO Juliann Epple, Cardinal Community Academy, Keenesburg, CO Length of Unit: Five Lessons-Lesson One may be divided into two forty minute classes or taught in a block I. ABSTRACT A. This unit introduces plant structures, processes of vascular plants, and photosynthesis as found in the Core Knowledge Sequence for 6-7th grade. II. OVERVIEW A. Concept Objectives
1. Understand the process of photosynthesis 2. Understand the structure of living systems. B. Content from the Core Knowledge Sequence 1. Nonvascular plants 2. Vascular plants 3. Photosynthesis is an important life process that occurs in plant cells, but not animal cells 4. Role in photosynthesis of: energy from sunlight, chlorophyll, carbon dioxide and water, xylem and phloem, stomata, oxygen, sugar (glucose) C. Skill Objectives 1. The student will ask questions and state predictions that can be addressed through scientific investigation. [Colorado State Standard 1.1] 2. The student will explore the process of photosynthesis. [CSS3] 3. The student will identify plant structures and functions. III. BACKGROUND KNOWLEDGE A. For Students 1. Students should understand the steps involved in the scientific procedure 2. Safe lab techniques and procedure 3. Basic scientific terminology IV. RESOURCES A. Wikipedia B. http://www.ckcolorado.org/units/5th_grade/5_photosynthesis.PDF V. Background Notes 1. Vascular plant systems a. responsible for conduction of water and dissolved nutrients b. examples: celery, carnation, daisy 2. Nonvascular plants a. do not have a conduction system b. dissolved nutrients move directly from cell to cell c. examples: algae, moss VI. Key Vocabulary 1. Vascular system: transports water and dissolved nutrients and offers support for the plant 2. Vascular plant: has a tube like that structure allows water and dissolved nutrients to move from roots to leaves, and food to move from leaves to the rest of the plant 3. Nonvascular plant: does not have a conduction system; dissolved nutrients move from cell to cell 4. Photosynthesis:istheconversionoflightenergyintochemicalenergybyliving
organisms.
PHOTOSYNTHESIS Write the equation for the chemical reaction called photosynthesis using symbols. CO2 + H2O light energy sugar + O Chlorophyll Write the equation for photosynthesis as a sentence. Carbon dioxide and water with light energy acting on chlorophyll yields sugar and oxygen. Draw the equation for photosynthesis using pictures. Color appropriately.
Assessment
Directions: Answer the following using the correct names and terms. 1. What did you learn about vascular plants that was demonstrated in Investigation # 1? _____________________________________________________________________________ _ _____________________________________________________________________________ _ _____________________________________________________________________________ _ _____________________________________________________________________________ _ _____________________________________________________________________________ _ 2. What did you learn about vascular plants that was demonstrated in Investigation #2? _____________________________________________________________________________ _ _____________________________________________________________________________ _ _____________________________________________________________________________ _ _____________________________________________________________________________ _ _____________________________________________________________________________ _ 3. What did you learn about the structure and functions of leaves in Investigation #3? _____________________________________________________________________________ _ _____________________________________________________________________________ _ _____________________________________________________________________________ _
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