Bio 1201 Chapter 10 -

Bio 1201 Chapter 10 - - CHAPTER 10 PHOTOSYNTHESIS I....

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PHOTOSYNTHESIS I. Photosynthesis transforms light energy trapped by chloroplasts into chemical bond energy and stores that energy in sugar and other organic molecules 1. Synthesis of energy-rich organic molecules from energy-poor molecules (CO2 and H2O) Photosynthesis = producer Make enough extra energy on their own for their own needs. 2. Uses CO2 as a carbon source and light-energy as the energy source. 3. Directly or indirectly supplies energy to most living organisms. II. Plants and other autotrophs are the producer of the biosphere A. Organisms acquire organic molecules used for energy and carbon skeletons (a.k.a. food) by one of two nutritional modes: 1. Autotrophic nutrition – known as the producer – Makes their own carbon skeletons to make their own energy to live. 2. Heterotrophic nutrition – known as the consumer – needs consumer to keep providing the producer poor molecule B. Autotrophic nutrition – nutritional mode in which the energy to live (and produce molecules) comes from some source other than organic molecules C. Photoautotrophic nutrition – autotrophic nutritional mode in which the energy to live (and produce molecules) comes from some light Chemoautotrophs – gets energy from inorganic light (doesn’t use sunlight) D. Heterotrophic nutrition – nutritional mode in which the energy to live (and produce molecules) comes from organic molecules Most of the organisms on earth are the heterotrophic Energy needs to come from organic molecules from somewhere else Consumes organic molecules Heterotrophic – cellular respiration – produces CO2 + H2O Lose Fats by breathing – CO2 The Leaf: Adaptations for Photosynthesis - 10.2.1 I. Chloroplasts are the site of photosynthesis in plants (see fig. 10.3) 1. Leaves are the major organs of photosynthesis 2. Chlorophyll is the green pigment that gives a leaf its color chlorophyll is also responsible for the absorption of the light energy that drives photosynthesis Leaves – arranged in layers (photosynthesis) All of the actions occur in the middle of the leaf – Mesophyll Skin on top differ from skin on bottom o Skin on bottom have holes, - pores – for gas exchange o CO2 comes in and O comes out 3. Chloroplasts are primarily in cells of mesophyll (in the leaf interior) – where we find the vast majority of chloroplasts in the plant 4. CO2 and H2O enter the leaf through pores called stomata 5. Water is absorbed by the roots and transported to the leaves through the vascular bundles. (like vessels) Bring stuff in and out of the leaf Water comes in from the vascular bundles Isotopes: Unraveling Photosynthesis - 2.1.4 I. Evidence that chloroplasts split water molecules let researchers track atoms through photosynthesis. a.
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Bio 1201 Chapter 10 - - CHAPTER 10 PHOTOSYNTHESIS I....

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