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Transcript
Learning Goal Students will be able to demonstrate their understanding of photosynthesis and cellular respiration in multiple contexts, at multiple scales. Some Common Misconceptions about Photosynthesis & Respiration Concept 1: Matter disappears during decomposition of organisms in the soil. Concept 2: Photosynthesis as Energy: Photosynthesis provides energy for uptake of nutrients through roots which builds biomass. No biomass built through photosynthesis alone. Thinking about: Tools: use multiple forms of assessment Need to move from: ‘what questions’ to ‘why’ questions Use data: inform instructional design Assessment Design Multiple iterations/versions of the carbon cycle problem Pretest, midterm, final with additional formative assessments during class Administered during instruction Multiple choice question (pre-post) The majority of actual weight (dry biomass) gained by plants as they progress from seed to adult plant comes from which one of the following substances? a. Particle substances in soil that are take up by plant roots. (15%). b. Molecules in the air that enter through holes in the plant leaves (4%). c. Substances dissolved in water taken up directly by plant roots. (28%). d. Energy from the sun (29%). N=138 Radish Problem (formative) Experimental Setup: Weighed out 3 batches of radish seeds each weighing 1.5 g. Experimental treatments: 1. Seeds placed on moistened paper towels in LIGHT 2. Seeds placed on moistened paper towels in DARK 3. Seeds not moistened (left DRY) placed in light Radish problem (2) After 1 week, all plant material was dried in an oven overnight (no water left) and plant biomass was measured in grams. Predict the biomass of the plant material in the various treatments. Water, light Water, dark No water, light Results: Weight of Radish Seedlings 1.46 g 1.63 g 1.20 g Write an explanation about the results.