1.8 1.6 1.4 1.2 KEY 1.0 Chlorophyll a 0.8 Chlorophyll b 0.6 0.4 0.2 Polluted Unpolluted area area Write six observations about the graph 1 2 3 5 6 Concentration of Pigment per Leaf (mg/g)
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- How can the physical properties of chlorophyll be used in measuring primary productivity in ecosystems? Hint: Can chlorophyll’s near infrared reflection be captured by special cameras?The graph above illustrates the absorption spectrum of chlorophyll a ONLY. Which colors of the visible light spectrum are absorbed best by chlorophyll a?All plants contain chlorophyll a. In addition, many plants contain other types of chlorophylls and accessory pigments. Suppose a new agricultural technology is developed in which accessory pigments are somehow embedded or injected into crops that naturally have only chlorophyll a. Explain the food production advantage that these plants could hypothetically provide if they could utilize many of these pigments rather than just one type of chlorophyll
- Most of the abundant gas in the atmosphere is not bioavailable to plants. How does this abundant gas become bioavailable?If a plant is removed from its natural environment and exposed to 100 percent CO2 composed of the radioisotope 14C, which of the following will not occur?a. What is photosynthesis and what is its importance to plant growth and primary productivity? b. What is the balanced equation for photosynthesis and how does it differ from cellular respiration? c. What are the key components of the light and dark reactions and how do you differentiate one from the other? d. How is photosynthesis measured? e. What are the environmental influences on photosynthesis? f. Include illustrations or figures appropriately. g. List your major references (at least five and no more than 10 references)
- Which among the three types of plants, C3, C4 or CAM plants, have the highest water use efficiency (WUE)? Explain.Three of the same species of plant are each grown under a different colored light for the same amount of time. Plant A is grown under blue light, Plant B is grown under green light, and Plant C is grown under orange light. Assuming the plants use only chlorophyll a and chlorophyll b for photosynthesis, what would be the predicted order of the plants from most growth to least growth? a. A, C, B b. A, B, C c. C, A, B d. B, A, CIf a plant is removed from its natural environment and exposed to 100 percent CO2 composed of the radioisotope 14C, which of the following will not occur? Select one: a. The rate of photorespiration will remain unchanged. b. The sugars synthesized by the plant will be radioactive. c. The oxygen released will also be radioactive. d. All the carbon molecules in the RuBP molecules will eventually become 14C. e. Rubisco will eventually contain 14C.
- What are the peak absorbances of the chlorophyll according to your graph? Does this correlate with your predictions?Name several examples of photoautotrophs and several of heterotrophs. How do photoautotrophs obtain energy? Can a plant be heterotrophic while a seedling and photoautotrophic when older?What is the chemical composition of pure cane sugar, equal original and splenda? and explain based on the composition the sweetness of different sugars and artificial sweeteners.
