Photosynthesis Virtual Lab 2: Exploring Light and Growth

Photosynthesis Virtual Lab and Lab Quiz How does photosynthesis affect oxygen levels? Hint: review figure 5-11 in your textbook b. Oxygen will be produced a. Oxygen will be used b. Oxygen will be produced c. Oxygen levels will remain unchanged How will cellular respiration affect oxygen levels? Hint: review figure 5-28 in your textbook a. Oxygen will be used a. Oxygen will be used b. Oxygen levels will remain unchanged c. Oxygen will be produced The process of photosynthesis is the capture and conversion of energy from the sun into chemical bonds. The greater intensity of light energy, the more oxygen will be produced. However, as higher levels of oxygen production are achieved, the output levels of oxygen begin to decrease. In your own words, hypothesize how light intensity will affect oxygen production. Hint: students may use their textbook to explore this topic 100% light intensity Starting oxygen levels: 7.0824 Ending oxygen levels: 9.0999 dissolved oxygen (DO) difference: -2.0175 80% light intensity Starting oxygen levels: 7.0651 Ending oxygen levels: 8.0951 dissolved oxygen (DO) difference: -1.03 Using the virtual lab simulation: 1. Set the fish number to 0 and the plant number to 5. Leave the other variables at the default values (temperature at 25 degrees, white light). 2. Set the light intensity to 100%. 3. Record the starting and ending oxygen values. 4. Repeat steps 3 and 4 for light intensity at 80%, 60%, 40%, and 20%. 5. Calculate and record the dissolved oxygen (DO) difference. 60% light intensity Starting oxygen levels: 7.0643 Ending oxygen levels: 7.1079 dissolved oxygen (DO) difference: -0.0436 40% light intensity Starting oxygen levels: 7.0377 Ending oxygen levels: 6.0185 dissolved oxygen (DO) difference: 1.0192 Students may create a graph on a separate sheet of paper to display how light intensity affects changes in DO. 20% light intensity Starting oxygen levels: 7.0741 Ending oxygen levels: 6.1172 dissolved oxygen (DO) difference: 0.9569 Which light intensity showed the greatest positive difference between the starting dissolved oxygen and the ending dissolved oxygen? a. 100% b. 80% c. 20% d. 40% e. 60% a. 100% Under which light intensity setting does photosynthesis produce the least amount of oxygen (end DO)? a. 100% b. 60% c. 80% d. 20% - INCORRECT The electromagnetic spectrum is the range of high-energy photons to low-energy photons. Plants use the visible portion of the electromagnetic spectrum during photosynthesis. Plants use the 1/3 In your own words, hypothesize how light color will affect oxygen pigment, chlorophyll, which is the main pigment molecule that production. absorbs light energy from the sun. The more light color the plants Hint: students may use their textbook to explore this topic are able to photosynthesize, the more oxygen will be produced. White Starting oxygen levels: 7.0543 Ending oxygen levels: 9.1221 dissolved oxygen (DO) difference: -2.0678 Violet Starting oxygen levels: 7.0632 Ending oxygen levels: 7.5803 dissolved oxygen (DO) difference: -0.5171 Using the virtual lab simulation: 1. Set the fish number to 0 and the plant number to 5. Leave the other variables at the default values (100% light intensity, temperature at 25 degrees). 2. Set the light color to white (combination of all wavelengths/colors). 3. Record the starting and ending oxygen values. 4. Repeat steps 3 and 4 for violet, blue, green, yellow, orange, and red light. 5. Calculate and record the dissolved oxygen (DO) difference. Students may create a graph on a separate sheet of paper to display how light color affects changes in DO. Blue Starting oxygen levels: 7.0277 Ending oxygen levels: 7.5633 dissolved oxygen (DO) difference: -0.5356 Green Starting oxygen levels: 7.0379 Ending oxygen levels: 6.0295 dissolved oxygen (DO) difference: 1.0084 Yellow Starting oxygen levels: 7.064 Ending oxygen levels: 6.1201 dissolved oxygen (DO) difference: 0.9439 Orange Starting oxygen levels: 7.0931 Ending oxygen levels: 7.1631 dissolved oxygen (DO) difference: -0.07 Red Starting oxygen levels: 7.0773 Ending oxygen levels: 7.3553 dissolved oxygen (DO) difference: -0.278 Which light color showed the greatest positive difference between the starting dissolved oxygen and the ending dissolved oxygen? a. Red b. Blue c. Violet d. Orange e. Green f. White g. Yellow f. White Under which light color setting does photosynthesis produce the least amount of oxygen (end DO)? a. Blue b. Violet c. Green d. White b. Violet Different plants have adapted to their natural climates and the battles that come with their ecosystem. For example, plants in In your own words, hypothesize how temperature will affect oxy- a hot/dry environment that need to compensate for water loss gen production. via evaporation, they can close their stomata. Enabling them to Hint: students may use their textbook to explore this topic close their pores. These plants also use a different type of photosynthesis, C4 photosynthesis, which ultimately reduces evaporation and admits minimal amounts of CO2. Ultimately, the type of 2/3 temperature in the natural habitat of a plant dictates the type of photosynthesis used. 15 degrees Starting oxygen levels: 7.4462 Ending oxygen levels: 8.6201 dissolved oxygen (DO) difference: -1.1739 20 degrees Starting oxygen levels: 7.2292 Ending oxygen levels: 9.0415 dissolved oxygen (DO) difference: -1.8123 Using the virtual lab simulation: 1. Set the fish number to 0 and the plant number to 5. Leave the other variables at the default values (100% light intensity, white light). 2. Set the temperature to 15 degrees. 3. Record the starting and ending oxygen values. 4. Repeat steps 3 and 4 for 20, 25, 30, and 35 degrees. 5. Calculate and record the dissolved oxygen (DO) difference. 25 degrees Starting oxygen levels: 7.0828 Ending oxygen levels: 9.1146 dissolved oxygen (DO) difference: -2.0318 30 degrees Starting oxygen levels: 6.5995 Ending oxygen levels: 8.0057 dissolved oxygen (DO) difference: -1.4062 Students may create a graph on a separate sheet of paper to display how light color affects changes in DO. 35 degrees Starting oxygen levels: 6.0195 Ending oxygen levels: 6.5502 dissolved oxygen (DO) difference: -0.5307 Which temperature showed the greatest positive difference between the starting dissolved oxygen and the ending dissolved oxygen? a. 30 degrees b. 20 degrees c. 35 degrees d. 15 degrees e. 25 degrees e. 25 degrees Under which temperature setting does photosynthesis produce the least amount of oxygen (end DO)? a. 20 degrees b. 35 degrees c. 30 degrees d. 25 degrees Write a paragraph explaining your conclusion in terms of the process of photosynthesis. b. 35 degrees The process of photosynthesis is functioned by plants using water, sunlight, and carbon dioxide. This process produces sugar and oxygen. Chloroplasts make it possible for plants to absorb and harvest sunlight through chlorophyll pigments. The light energy from the sun is captured as chemical energy (this is the "photo" part of photosynthesis). The captured energy is converted into sugar (this is the "synthesis" part of photosynthesis). 3/3