Test 3 - Chapter 7 Capturing Solar Energy Photosynthesis I...

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Chapter 7 Capturing Solar Energy: Photosynthesis I. Chloroplasts are the site of photosynthesis in plants. a. Photosynthesis transforms light energy trapped by chloroplasts into chemical bond energy and stores that energy in sugar and other organic molecules. i. Synthesis of energy-rich organic molecules (glucose) from energy-poor molecules (CO 2 and H 2 O) ii. Uses CO 2 as a carbon source and sunlight-energy as the energy source. iii. Directly or indirectly supplies energy to most living organisms. II. Photosynthesis vs. Cellular Respiration a. Photosynthesis is the opposite of cellular respiration. b. During photosynthesis, glucose and other energy-rich molecules are made through a process that requires energy from the sun. c. During cellular respiration, energy is obtained from glucose and other energy-rich molecules. III. Leaves are the major organs of photosynthesis. a. 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. b. Chloroplasts are primarily in cells of mesophyll (in the leaf interior) c. CO 2 and H 2 O enter the leaf through pores called stomata or stoma. d. Water is absorbed by the roots and transported to the leaves through the vascular bundles.
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