In the light-dependent reactions, energy from sunlight is absorbed by chlorophyll and that energy is converted into stored chemical energy. Obtain diagrams of leaf structures to illustrate the content of this section. As we studied in Cellular Respiration, aerobic cellular respiration taps into the oxidizing ability of oxygen to synthesize the organic compounds that are used to power cellular processes. Organisms are linked by lines of descent from common ancestry. This … 8: Photosynthesis Short Answer Questions 1. In eukaryotes, the reactions of photosynthesis occur in chloroplasts; in prokaryotes, such as cyanobacteria, the reactions are less localized and occur within membranes and in the cytoplasm. Photosynthesis produces carbohydrates. Examples of photoautotrophs include plants, algae, some unicellular eukaryotes, and cyanobacteria. As shown in Figure 8.6, a stack of thylakoids is called a granum, and the liquid-filled space surrounding the granum is called stroma or “bed” (not to be confused with stoma or “mouth,” an opening on the leaf epidermis). Breaking down photosynthesis stages. Light-dependent reactions, which take place in the thylakoid membrane, use light energy to make ATP and NADPH. This step requires ample sunlight for the process and hence it is termed as the light-dependent phase of photosynthesis. Cyclic electron flow is thought to be similar to the first forms of photosynthesis to evolve. The light reactions produces ATP and NADPH, which are then used in the Calvin cycle. OpenStax is part of Rice University, which is a 501(c)(3) nonprofit. This should help the students to connect the two pathways of photosynthesis and cellular respiration. Other organisms, such as animals, fungi, and most other bacteria, are termed heterotrophs (“other feeders”), because they must rely on the sugars produced by photosynthetic organisms for their energy needs. The light-dependent reactions. After the process is complete, it releases oxygen and produces glyceraldehyde-3-phosphate (G3P), simple carbohydrate molecules (which are high in energy) that can subsequently be converted into glucose, sucrose, or any of dozens of other sugar molecules. @o�Q�. %%EOF The light reactions produce only NADPH, which is produced by the Calvin cycle. In plants, photosynthesis generally takes place in leaves, which consist of several layers of cells. The student can pose scientific questions. Light is not limiting photosynthesis Light becomes limiting with increasing depth Photosynthesis = … If you found this free resource to be useful, please take a moment to leave a positive review! Using the energy from light and the hydrogens and electrons from water, the plant combines the carbons found in carbon dioxide into more complex molecules. Thesis vs theme statement with ap biology photosynthesis essay rubric. The ecosystem surrounding the vents has a diverse array of animals, such as tubeworms, crustaceans, and octopi that derive energy from the bacteria. Reactions of photosynthesis, where they take place, and their ecological importance. are licensed under a, Atoms, Isotopes, Ions, and Molecules: The Building Blocks, Connections between Cells and Cellular Activities, Structure and Function of Plasma Membranes, Potential, Kinetic, Free, and Activation Energy, Oxidation of Pyruvate and the Citric Acid Cycle, Connections of Carbohydrate, Protein, and Lipid Metabolic Pathways, The Light-Dependent Reaction of Photosynthesis, Signaling Molecules and Cellular Receptors, Mendel’s Experiments and the Laws of Probability, Eukaryotic Transcriptional Gene Regulation, Eukaryotic Post-transcriptional Gene Regulation, Eukaryotic Translational and Post-translational Gene Regulation, Viral Evolution, Morphology, and Classification, Prevention and Treatment of Viral Infections, Other Acellular Entities: Prions and Viroids, Animal Nutrition and the Digestive System, Transport of Gases in Human Bodily Fluids, Hormonal Control of Osmoregulatory Functions, Human Reproductive Anatomy and Gametogenesis, Fertilization and Early Embryonic Development, Climate and the Effects of Global Climate Change, Environmental Limits to Population Growth, Behavioral Biology: Proximate and Ultimate Causes of Behavior, The Importance of Biodiversity to Human Life. 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