Active Lecture Questions for BIOLOGY, Eighth Edition Neil Campbell & Jane Reece Questions prepared by Jung Choi, Georgia Institute of Technology Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Chapter 10 Photosynthesis

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Does a Tree’s Biomass Come from the Soil? A 17th-century scientist named van Helmont planted a willow sapling in a large pot with 200 pounds of dry soil and allowed it to grow, giving it only rainwater or distilled water. He weighed the soil and tree (with roots) before planting and after 5 years of growth. What information do you need to predict the weight of the soil remaining after 5 years with 99% accuracy? a)the weight of the tree at start and after 5 years b)the percentage of the tree weight that is water c)the weight of leaves lost by the tree each fall d)the weight of all the water added e)all of the above

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Photosynthesis and Biomass The biomass (dry weight) of a tree comes primarily from a)soil. b)water. c)air. d)organic fertilizer (manure, detritus). e)light.

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Photosynthesis and Organic Carbon The organic carbon in a tree comes primarily from a)soil. b)water. c)air. d)organic fertilizer (manure, detritus). e)light.

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Origin of Oxygen Gas Which experiment will produce 18 O 2 ? a)experiment 1 b)experiment 2 c)both experiment 1 and experiment 2 d)neither

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Oxygen, Earth History, and Evolution Which evolutionary development caused the initial oxygenation of the earth’s atmosphere? a)the evolution of the earliest photosynthetic organisms that had only PSI b)the evolution of cyanobacteria with non-cyclic photophosphorylation c)the evolution of the first land plants d)the evolution of the woody plants e)the evolution of flowering plants

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Photosystem I and Cyclic Photophosphorylation Photosynthetic bacteria that have only Photosystem I a)can split water molecules to produce oxygen. b)cannot fix carbon dioxide. c)generate ATP but not NADPH. d)can reduce NADP+ to NADPH but cannot make ATP through photophosphorylation. e)can reduce NADP+ to NADPH and make ATP through cyclic photophosphorylation.

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Calvin-Benson Experiment to Identify CO 2 Acceptor In this diagram, compound X is the CO 2 acceptor. If CO 2 is cut off, then a)X and 3PG will both increase. b)X will increase, 3PG decrease. c)X will decrease, 3PG increase. d)X and 3PG will both decrease.

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Calvin-Benson Experiment to Identify CO 2 Acceptor In this diagram, compound X is the CO 2 acceptor. If light is cut off, then a)X and 3PG will both increase. b)X will increase, 3PG decrease. c)X will decrease, 3PG increase. d)X and 3PG will both decrease.

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Photosynthesis and Respiration A flask of duckweed in water is placed under a bank of lights on a 12-hour light, 12-hour dark cycle, next to a control flask containing only water. Assuming no change in water temperature, which flask will have the lowest dissolved oxygen (DO) concentration, at what time? a)DO will be the same between the control and the duckweed- containing flask. b)DO will always be higher in the flask with duckweed compared to the control. c)DO will always be lower in the flask with duckweed compared to the control. d)The flask with duckweed will have the lowest DO at the end of the dark cycle and the highest DO at the end of the light cycle.

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Evolution of Metabolic Pathways Which metabolic pathways were present in the last universal common ancestor (are present in all three domains of life)? a)Calvin cycle b)glycolysis c)citric acid cycle d)chemiosmotic ATP synthesis e)all of the above

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Carbon Fixation and Climate Change How will increasing atmospheric CO 2 levels affect growth of terrestrial plants? a)All plants will grow faster. b)Most plants will be adversely affected. c)C3 plants will grow faster, with no effect on C4 plants. d)C4 plants will thrive while C3 plants suffer. e)none of the above