1. Your graph should have two "peaks." At the highest of the two, what wavelength was most strongly absorbed by the chloroplast pigments? What wavelength corresponds the top of the second peak? What wavelength was least absorbed by the chloroplast pigments? 2. Based on your observations, which wavelength (color) of light might be expected to generate the lowest rate of photosynthesis?

Which of the following is true of light-independent reactions of photosynthesis? Select all that apply. a. Light-independent reactions occur in the stroma. b. Water molecules are split during light-independent reactions. c. Chlorophyll absorbs energy from sunlight. d. Carbon dioxide is necessary for light-independent reactions.

The investigator suggested that insufficient amounts of carbon dioxide in the water may have been one of the factors that prevented further increases in the rate of photosynthesis at higher light intensities. Why would inadequate amounts of carbon dioxide affect the rate of photosynthesis? Select one or more: a. Carbon dioxide is needed for the production of sugars in the light reactions of photosynthesis b. Carbon dioxide is needed for the production of sugars in the Calvin Cycle of photosynthesis c. Carbon dioxide is needed for the production of ATP in the Calvin Cycle d. Carbon dioxide is the source of oxygen in photosynthesis e. Carbon dioxide is needed for the production of ATP in the light reactions of photosynthesis

Photosynthesis can be measured by measuring the rate of oxygen production. When plants are exposed to light of wavelength 680 nm, more oxygen is evolved than if the plants are exposed to light of 700 nm. Explain.

1. Define energy and state where living things get the energy they need. 2. What is an autotroph? Give an example. 3. How does photosynthesis change energy? 4. How do heterotrophs obtain food? 5. What are the stages of photosynthesis? Which stage occurs first? 6. Describe the chloroplast and its role in photosynthesis. 7. Summarize what happens during the light reactions of photosynthesis.

Put the events in correct order: + A photon of light excites a pigment molecule in photosystem I + Excitation is transferred to the photosystem Il reaction center chlorophyll * The photosystem Il electron is replaced by splitting of water + Excitation is transferred to the photosystem I reaction center chlorophyll + An electron is donated to NADP+ + A photon of light excites a pigment molecule in photosystem II + The photosystem II reaction center chlorophyll donates an electron to photosystem I via an electron transport chain

Heat energy was not identified in the photosynthesis equation, yet gardeners will tell you that the warmth of the greenhouse is advantageous in producing healthy and faster growing plants. How do you explain this?

1. Which of the following statements is most accurate?   a. The Calvin cycle is a repeating process that uses carbon dioxide, ATP, and NADPH molecules to allow the cell to produce one glucose molecule.   b. Each turn of the Calvin cycle is designed to use a glucose molecule to produce RuBP, 3-PGA, 3-G3P, ATP and NADPH molecules.     c. The Calvin cycle is a continuous process that utilizes rubisco molecules to produce RuBP molecules which can be directly converted to glucose molecules for long term energy storage.   2. How many glucose molecules are produced for every turn of the Calvin cycle?   a. 0 b. 1 c. 2 d. 3 e. 6 f. 12

1. Is carbon dioxide essential for photosynthesis? Justify 2. What is the relationship between photosynthesis efficiency and light intensity? Justify 3. For equal quantities of photons, what is the increasing order of effectiveness (less effective to more effective) of blue, red, green and white light (combination of the three main wavelengths) on photosynthetic activity? Justify

Complete the chart