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EXPLAIN: CONVERTING SUNLIGHT INTO SUGAR Photosynthesis is the process by which
plants use the sun’s energy to convert water and carbon dioxide into sugars.
Read “Energy” p. 327 – 329 Take Notes!
EXPLAIN: CONVERTING SUNLIGHT INTO SUGAR Energy is the ability to do work. Kinetic energy is the energy of motion Potential energy is energy that is stored
due to an object’s position or arrangement.
Energy can be converted from one form to another.
Different types of energy – chemical, light, electrical, mechanical, thermal
EXPLAIN: CONVERTING SUNLIGHT INTO SUGAR Organic molecules have a form of
potential energy called chemical energy
Chemical energy has the potential to do work due to the arrangement of the atoms within the molecules.
The rearrangement of atoms during chemical reactions releases the potential energy, and the energy is then available to do work.
EXPLAIN: CONVERTING SUNLIGHT INTO SUGAR
EXPLAIN: CONVERTING SUNLIGHT INTO SUGAR Photosynthesis is the process by which
plants use the sun’s energy to convert water and carbon dioxide into sugars.
Light is the only source of energy for plants! Plants convert light energy into chemical
energy -> Photosynthesis Recall that light is energy Different colors of light have different
wavelengths and different amounts of energy.
Red light = low energy Blue light = high energy
EXPLAIN: CONVERTING SUNLIGHT INTO SUGAR
Light is a form of energy called Electromagnetic energy.
EXPLAIN: CONVERTING SUNLIGHT INTO SUGAR A substance’s color is due to chemical
compounds called pigments. When light hits an object the
wavelengths can be transmitted, absorbed, or reflected.
EXPLAIN: CONVERTING SUNLIGHT INTO SUGAR Chloroplasts contain pigments called
Chlorophyll a, Chlorophyll b, and Carotenoids.
Each pigment absorbs different wavelengths of light.
EXPLAIN: CONVERTING SUNLIGHT INTO SUGAR Notice that chloroplasts absorb blue-
violet and red-orange light very well. The chloroplasts convert the absorbed
light energy into chemical energy. Why are leaves green? Why do leaves change colors in the fall? Complete Stop & Think #1-4 p. 329
EXPLAIN: CONVERTING SUNLIGHT INTO SUGAR Read “Making Carbon Compounds” p.
330-333 Take notes! Read “Energy Currency of Cells” p. 333 Take Notes.