ART 1 a plant that has pigments chlorophyll A, chlorophyll B, elength of light i

Question

ART 1 a plant that has pigments chlorophyll A, chlorophyll B, elength of light is LEAST effective for photosynthesis? 9. Based on the figure below for has pigmen a. 420 nm b. c, 600 nm d. 690 nm Chigrophyl A 475 nm Cerotercids 700 Wavelengtt of ight m 10. As electrons are passed through the system of electron carriers associated with photosystem Il, energy is released. What happens to this energy? a. It breaks water to provide electrons for photosystem 1. CIt is used to establish and maintain a proton gradient. d. It is used to phosphorylate NAD to NADPH Questions #11 12 pertain to the experiment below. Students conducted an experiment to determine the effect of light intensity on the rate to pull the gases from the leaf disks. Ten leaf disks were placed in each of four cups and covered with 50 mL of the solution as indicated below. All leaf disks were resting at the bottom of the cups when the experiment began. All cups were placed 0.5 m from the designated light source and the temperature was kept constant. At the end of 10 minutes, the number of disks floating in each cup was recorded. Trial Baking Soda CO2 Wattage of light Disks floating at source (grams) bulb 0.5 0.5 0.5 10 minutes 25 50 75 75 9 0 11. Why did some of the disks float after 10 minutes? a. They accumulated oxygen due to photosynthesis. ey accumulated carbon dioxide due to photosynthesis. c. They accumulated carbon dioxide and oxygen due to photosynthesis d. They became less dense due to photosynthesis

Explanation / Answer

9. C. 600 nm is the wavelenth of light which least effective for photosynthesis.

It is clear from the graph that at 600 nm, the amount of light absorbed is almost equal to zero.

10. C. It is used to establish and maintain proton gradient.

Group of membrane-embedded electron carriers that pass electrons from one to another, and, in the process, create a proton motive force. Energy is gradually released as electrons are passed from one carrier to another, the energy released is coupled to the ejection of protons, which creates an electrochemical proton gradient. Energy from this gradient is harvested by the cell to synthesize ATP.

11. A They accumulated oxygen due to photosynthesis.

The presence of sodium bicarbonate increased the amount of photosynthesis. The oxygen produced from photosynthesis caused the discs to float when photosynthesis had occurred.

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