Outline chapter 10, typed notes (Repaired)

Outline chapter 10, typed notes (Repaired) - Chapter 10 -...

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Chapter 10 - Photosynthesis Photosynthesis transforms light energy trapped by chloroplasts into chemical bond energy and stores that energy in sugar and other organic molecules. A lot of mechanisms in photosynthesis are very similar to cellular respiration. o Synthesis of energy-rich organic molecules from energy-poor molecules (CO 2 and H 2 O) Production supplies the energy for the other organisms on the planet, making them the producers o Uses CO 2 as a carbon source and light-energy as the energy source. o Directly or indirectly supplies energy to most living organisms. Major Modes of Nutrition among Organisms Plants and other autotrophs are the producers of the biosphere Organisms acquire organic molecules used for energy and carbon skeletons (a.k.a. food) by one of two nutritional modes: 1. Autotrophic nutrition – makes its own carbon skeletons, starting with CO 2 and making its own energy that it needs to live – autotrophs 2. Heterotrophic nutrition – We are heterotrophs. Needed as consumers for photosynthesis to continue to make CO2 for autotroph photosynthesis Autotrophic nutrition is a nutritional mode in which the energy to live and produce molecules comes from some source other than organic molecules. (Photosynthesis is just one type) Photoautotrophic nutrition is an autotrophic nutritional mode in which the energy to live and produce organic molecules comes from light. Most autotrophs on this planet are photoautotrophs, but some organisms are autotrophic that don’t use light energy but inorganic energy. Chemoautotrophs get their energy from inorganic chemicals like sulfur, etc. – They give electrons to this inorganic molecule and will generate that inorganic molecule rather than O2. Without sunlight, photoautotrophic nutrition is impossible. Everything that lives deep below the ocean’s surface lives by what the chemoautotrophs produce. Heterotrophic nutrition is a nutritional mode in which the energy to live and produce molecules comes from organic molecules (chapter 9) When you lose weight, most of the fat goes out as CO 2 when we breathe.
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The Leaf: Adaptations for Photosynthesis Chloroplasts are the site of photosynthesis in plants Leaves are the major organs of photosynthesis o 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 o Chloroplasts are primarily in cells of mesophyll (in the leaf interior) – where the action occurs. It is arranged in different layers. The skin on the top is different than on the bottom because on the bottom it has pores called stomata that let gas exchange go on because to do photosynthesis we must take energy poor molecules to make energy rich molecules. CO2 goes in and O2 goes out.
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This note was uploaded on 08/29/2010 for the course BIOL 1201 taught by Professor Wishtichusen during the Fall '07 term at LSU.

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Outline chapter 10, typed notes (Repaired) - Chapter 10 -...

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