Physical Science Thank you for your input.
Ideally, a teacher would have no more than twenty four students to coach through this activity. A student will have prior knowledge as to the equation describing the photosynthetic process as well as having a basic understanding of the scientific method.
The lab could be used in a unit on, the scientific method, a photosynthetic unit or in a unit on environmental problems global climate change and its affect on plants.
Teacher and students will review the equation describing photosynthesis. What types of organisms undergo photosynthesis? Discussion will include the ideas that not all plants photosynthesize at the same rate. Brainstorming will bring out possible reasons and variables that would influence photosynthesis.
Leaf structures will be named and discussion will relate these structures to the processes of photosynthesis that occur in each.
This would be the time to give examples of how some questions scientists raise are not testable. Students should be thinking about the question they will raise about the photosynthesis experiment and if an investigation can be designed to test their question.
The teacher can now review what a hypothesis is and how to write a specific, testable hypothesis. Basic Materials needed for lab group of students: The teacher will now demonstrate to students the basic technique that will be used to measure the rate of photosynthesis. All students will be guided to use this technique.
They can now practice this technique see experimental design and the following web site http: Pick a testable question to answer when doing the experiment. Give students time to design experiment and do a trial run. Class discussion will connect the lab to world issues; food availability, global climate change.
Teaching Notes and Tips 1 Use fresh spinach leaves, soak them in water overnight at about 4 degrees C. This increases turgor pressure and minimizes "limp" leaves. Use only the firm, dark green areas of the leaf. Avoid major veins or damaged areas. Too little vacuum treatment causes the disks not to sink, too much vacuum treatment may kill the cells.
Assessment Two rubrics will be used to assess student lab report sample of report included below and student participation. A written exam will be used to determine if a student has met the goals of the activity.
Where in a leaf does photosynthesis mainly occur?
How does carbon dioxide get into a leaf? How does water get into a leaf from the roots? Obtain a prepared slide of a leaf cross section x-section. Using x make a sketch of what you see.
Use the text book or internet to label the following tissues; Upper epidermis, lower epidermis, palisade mesophyll, spongy mesophyll, vein label both xylem and phloemguard cells, stoma 1 In which of the labeled structures, does most of the photosynthesis occur?
Write out a balanced equation for photosynthesis: Experimental Design Your table will design an experiment to test how a selected variable affects the rate of photosynthesis. Follow the information below to make "sinking plant disks".
You will measure how long it takes in seconds for the disks to float as a way to measure the rate of photosynthesis. Preparation of the leaf disks: You should see air coming out the sides of the disks. As this is done, the oxygen is being removed from the spongy layer of the leaf and the.Factors affecting the rate of Aim: Investigate any one of the factors affecting the rate of heat loss in a liquid.
Introduction: Heat is a form of energy which flows due to a temperature difference.
A) Design a simple experiment using the reaction of magnesium ribbon and magnesium powder with hydrochloric acid that will qualitatively investigate the affect of surface area of the reactants on the rate of reaction.
C. Graham Brittain Page 1 of 12 11/14/ Factors Affecting the Rate of a Chemical Reaction What you will accomplish in this experiment.
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Students will work in small groups to design an experiment with one independent variable and test this variable on spinach leaf disks. The punched out leaf disks will initially sink in a test tube of water but will float as photosynthesis occurs. A heart-rate monitor is the most important tool for developing optimal endurance and better fat-burning.
This simple device is a valuable tool that not only guides your training but is part of an important assessment process, and can even be used in some competitive situations.