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CHAPTER 10-Photosynthesis • Life on Earth is solar powered • Photosynthesis nourishes almost all the living world directly or indirectly All organisms use organic compounds for energy and for carbon skeletons. Organisms obtain organic compounds by one of two major modes: autotrophic or heterotrophic AUTOTROPHS (=producers)
Chlorophyll excited by light absorption. E passed to reaction center of Photosystem II (protein + chlorophyll a) e- captured by primary electron acceptor. Redox reaction e- transfer. e- prevented from losing E (drop to ground state) H2O is split to replace e- O2 formed. e- passed to Photosystem I via ETC.
Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms' activities (energy transformation). 2.5.2: Overview of Photosynthesis. Photosynthesis is essential to all life on earth; both plants and animals depend on it.
Photosynthesis is the process by which plants, some bacteria and some protistans use the energy from sunlight to produce glucose from carbon dioxide and water. This glucose can be converted into pyruvate which releases adenosine triphosphate (ATP) by cellular respiration. Oxygen is also formed. Photosynthesis may be summarised by the word equation:
Plants use the sugars to produce complex carbohydrates such as starches. Plants also contain red and orange pigments such as carotene which absorbs light in other areas of the spectrum. Energy absorbed by chlorophyll is transferred directly to electrons in the chlorophyll molecule. These high energy electrons make photosynthesis work!
Title: Campbell Biology in Focus, 2e C/M/Y/K Short / Normal / Long S4CARLISLEDESIGN SERVICES OF Publishing Services 8 Photosynthesis Figure 8.1 How does sunlight help build the trunk, branches, and leaves of this broadleaf tree? KEY CONCEPTS 8.1 Photosynthesis converts light energy to the chemical energy of food
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Photosynthesis is a multi-step process that requires specific wavelengths of visible sunlight, carbon dioxide (which is low in energy), and water as substrates (). After the process is complete, it releases oxygen and produces glyceraldehyde-3-phosphate (GA3P), as well as simple carbohydrate molecules (high in energy) that can then be converted into glucose, sucrose, or any of dozens of other ...
