Exercise 3: Which colors (wave-lengths) of light are most effective in driving photosynthesis? Now you have determined which plant pigments are most photosynthetically active, and you know which wavelengths of light are absorbed by the different plant pigments, you should be able to predict which wavelengths of light allow the greatest amount of photosynthetic activity in leaves. In order to investigate this, we exposed aquatic plants to filtered light. Filters are transparent films that transmit a assortment of light wavelengths. The color of the limited light that passes through the filter is the color that you see. All other colors of light are absorbed by the filter. We measure how much oxygen aquatic plants produce as they photosynthesize by tapping the plants' containers until all oxygen bubbles were released from the plant and floated Figure 8. Experimental design. Inverted test tubes with similar-length sections of aquatic plants were covered with various filters and placed equal distances from lamps. The plants were allowed to photosynthesize for one hour. After this time, the tubes were tapped to release oxygen bubbles, and the diameter of the bubble produced was recorded. to the top of the tube. Then we measured the diameter of the oxygen "bubble." Some plants received full-spectrum light (no filter), but others were covered by blue, red, and green filters (which limit the wavelengths reaching the plant to blue, red, and green, respectively). Finally, one plant was be covered with aluminum foil, so that no light reached it. (see Figure 8).
Exercise 3: Which colors (wave-lengths) of light are most effective in driving photosynthesis? Now you have determined which plant pigments are most photosynthetically active, and you know which wavelengths of light are absorbed by the different plant pigments, you should be able to predict which wavelengths of light allow the greatest amount of photosynthetic activity in leaves. In order to investigate this, we exposed aquatic plants to filtered light. Filters are transparent films that transmit a assortment of light wavelengths. The color of the limited light that passes through the filter is the color that you see. All other colors of light are absorbed by the filter. We measure how much oxygen aquatic plants produce as they photosynthesize by tapping the plants' containers until all oxygen bubbles were released from the plant and floated Figure 8. Experimental design. Inverted test tubes with similar-length sections of aquatic plants were covered with various filters and placed equal distances from lamps. The plants were allowed to photosynthesize for one hour. After this time, the tubes were tapped to release oxygen bubbles, and the diameter of the bubble produced was recorded. to the top of the tube. Then we measured the diameter of the oxygen "bubble." Some plants received full-spectrum light (no filter), but others were covered by blue, red, and green filters (which limit the wavelengths reaching the plant to blue, red, and green, respectively). Finally, one plant was be covered with aluminum foil, so that no light reached it. (see Figure 8).
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter34: Transport In Plants
Section: Chapter Questions
Problem 13TYK: Discuss Concepts Concerns about global climate change and the greenhouse effect center on rising...
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I am stuck on four questions for this lab and they are:
1. What is the question being investigated in this experiment.
2. What is the independent variable?
3. What is the dependent variable?
17. What are the control treatments?
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