Energy in Living Systems Photosynthesis I: Harnessing the energy of the sun by Nathan H Lents, Ph.D., John Nishan Reading Quiz Teach with this 1. The products of photosynthesis are water and carbon dioxide. sugar and water. sugar and oxygen. oxygen and water. 2. In Priestley’s experiments, what was released by the mint sprig and allowed the candle to burn again? oxygen water vapor carbon dioxide nitrogen 3. When a photon of light energy reaches a reaction center chlorophyll molecule, what becomes excited? a molecule of water vapor an electron a carbon dioxide molecule an atom of oxygen 4. The difference between P700 and P680 is that the concentration of chlorophyll molecules is greater in P700. P680 is only used in the cyclic electron flow. P680 is found in algae while P700 is found in land plants. P700 absorbs light with a wavelength of 700 nm. 5. The products of the light-dependent reactions of photosynthesis are sugar and water. sugar and oxygen. ATP, NADPH, and oxygen. ATP and sugar. 6. __________ is the final electron acceptor in photosystem I. Water Chlorophyll NADP+ Oxygen 7. What is the purpose of cyclic electron flow? It creates water needed for cellular respiration. It creates only ATP, needed by the light-independent reactions. It supplies electrons for photosystem I. It cleaves water into oxygen and hydrogen ions. 8. Why do plants appear green? They absorb green light. They excite electrons which emit green light in the visible spectrum. They reflect green light. They absorb electrons by green pigments when exposed to sunlight. 9. Light-harvesting complexes, excited by photons of light, are made of proteins and sugars. proteins, cofactors, and pigment. pigment and sugars. proteins and water. 10. When electrons are passed through an electron transport chain, released energy is lost as heat. splits water into hydrogen and oxygen. fuses carbon dioxide molecules into a sugar. is transformed into a hydrogen ion gradient to drive ATP synthesis. Score Quiz
