Spinach disk graph title1/7/2024 ![]() The teacher will now demonstrate to students the basic technique that will be used to measure the rate of photosynthesis. Other materials as students design experiments would some substances inhibit photosynthesis? (act as weed killers?) Weak acids / weak bases to change the pH of the solution Different species of plant (other than spinach) Colored cellophane (yellow, green, red, blue are typical colors one can purchase)(to change wavelength's of light the plants receive) Various types of light bulbs (fluorescent, incandescent) Possible extra materials needed depending on variable chosen to test: Prepared microscope slides of leaf cross sections plant in sun, plant in shade, desert plant, water lily 2 % sodium bicarbonate (baking soda) solution 4 mm core borer (used to cut holes in cork stoppers, can purchase ones of various sizes, use one about size of paper punch) or paper punch (see web source) The teacher can now review what a hypothesis is and how to write a specific, testable hypothesis.īasic Materials needed for lab group of 3-4 students: 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. This would be the time to give examples of how some questions scientists raise are not testable. The teacher would now discuss/ review the process of the scientific method. Additional slides of the leaves of a desert plant, water lily, shade plants could be shown/used for comparison and discussion of plant adaptations. Leaf structures will be named and discussion will relate these structures to the processes of photosynthesis that occur in each. Prepared microscope slides of leaf cross sections will be observed/ drawn. ![]() This could include but would not be limited to plant species, habitat, altitude, depth in water, temperature, carbon dioxide available, water available (desert, tundra, grassland), pH of soil / water Brainstorming will bring out possible reasons and variables that would influence photosynthesis. What types of organisms undergo photosynthesis? Discussion will include the ideas that not all plants photosynthesize at the same rate. Teacher and students will review the equation describing photosynthesis. In turn, climate change (warmer in some regions, cooler in other regions) may affect various species of plants differently. ![]() By increasing the use of carbon dioxide by plants, it may help slow global climate change. This carbon dioxide will be supplied by sodium bicarbonate dissolved in the water with the plant leaf disksģ) the stomata opening is controlled by the guard cells and that water, carbon dioxide and oxygen all pass through the stoma openingsĤ) food production for animals and humans on earth is dependent on plants. The students will learn that:ġ) the variables of light intensity, temperature, carbon dioxide, light quality all influence the rate of photosynthesis.Ģ) photosynthesis requires carbon dioxide to furnish the carbon required to make glucose. The students will learn specific concepts during the activity. The teacher will guide students to problem solve as they design and modify the experiment to insure only one independent variable is being tested during the experiment. The students will need to determine if the question they have chosen to test, is indeed testable. ![]() They will improve their observing, questioning and communicating skills. They will need to use critical thinking to design the experiment and analyze the collected data. Students will use higher order thinking skills throughout this activity. This activity is designed for students to:ġ) learn that the rate of photosynthesis is influenced by environmental factors that can be quantifiedĢ) understand the equation of photosynthesis and how the structure of a leaf allows for the required gas exchange to occur through the stomataģ) properly design an experiment with one variable, analyze results and report findings to the class
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |