Lesson Overview Photosynthesis An Overview Lesson Overview 8

Lesson Overview Photosynthesis: An Overview Lesson Overview 8. 2 Photosynthesis: An Overview

Lesson Overview Photosynthesis: An Overview THINK ABOUT IT Ø How would you design a system to capture the energy of sunlight and convert it into a useful form? Ø Plants have solved these issues—and maybe we can learn a trick or two from them.

Lesson Overview Photosynthesis: An Overview Light Ø Energy from the sun travels to Earth in the form of _____. Ø Sunlight is a mixture of different ______, many of which are visible to our eyes and make up the _______.

Lesson Overview Photosynthesis: An Overview Light Ø Our eyes see the different wavelengths of the visible spectrum as different colors: red, orange, yellow, green, blue, indigo, and violet.

Lesson Overview Photosynthesis: An Overview Pigments Ø Plants gather the sun’s energy with lightabsorbing molecules called _____. Ø The plants’ principal pigment is ________.

Lesson Overview Photosynthesis: An Overview Pigments Ø The two types of chlorophyll found in plants, ______and ______, absorb light very well in the blue-violet and regions of the visible spectrum, but not in the green region, as shown in the graph. Ø Leaves ____ green light, which is why plants look green.

Lesson Overview Photosynthesis: An Overview Pigments Ø Plants also contain red and orange pigments such as _____ that absorb light in other regions of the spectrum.

Lesson Overview Photosynthesis: An Overview Pigments Ø Most of the time, the green color of the chlorophyll overwhelms the other pigments, but as _______ drop and chlorophyll molecules break down, the red and orange pigments may be seen.

Lesson Overview Photosynthesis: An Overview Chloroplasts Ø Photosynthesis takes place inside organelles called ________. Ø Chloroplasts contain saclike photosynthetic membranes called _______, which are interconnected and arranged in stacks known as ______.

Lesson Overview Photosynthesis: An Overview Chloroplasts Ø Pigments are located in the thylakoid ______. Ø The fluid portion outside of the thylakoids is known as the ______.

Lesson Overview Photosynthesis: An Overview Energy Collection Ø Because light is a form of ____, any compound that absorbs light absorbs energy. Chlorophyll absorbs visible light especially well. Ø When chlorophyll absorbs light, a large fraction of the light energy is transferred to _____. These high-energy electrons make photosynthesis work.

Lesson Overview Photosynthesis: An Overview High-Energy Electrons Ø The high-energy electrons produced by chlorophyll are highly reactive and require a special “_____. ”

Lesson Overview Photosynthesis: An Overview High-Energy Electrons Ø Think of a high-energy electron as being similar to a hot potato. If you wanted to move the potato from one place to another, you would use an oven mitt—a ____—to transport it. Ø Plants use electron carriers to _____ high-energy electrons from chlorophyll to other ______.

Lesson Overview Photosynthesis: An Overview High-Energy Electrons Ø ____(nicotinamide adenine dinucleotide phosphate) is a carrier molecule. Ø NADP+ accepts and holds ____ high-energy electrons, along with a ________(H+). In this way, it is converted into ______. Ø The NADPH can then carry the high-energy electrons to ____________elsewhere in the cell.

Lesson Overview Photosynthesis: An Overview of Photosynthesis Ø Photosynthesis uses the energy of sunlight to convert water and carbon dioxide into high-energy _______ and _______. In symbols: In words:

Lesson Overview Photosynthesis: An Overview of Photosynthesis Ø Plants use the ______ generated by photosynthesis to produce ______________ such as starches, and to provide energy for the synthesis of other compounds, including ____ and ______.

Lesson Overview Photosynthesis: An Overview Light-Dependent Reactions Ø Photosynthesis involves two sets of reactions. Ø The first set of reactions is known as the _____________ because they require the direct involvement of light and light-absorbing pigments.

Lesson Overview Photosynthesis: An Overview Light-Dependent Reactions Ø The light-dependent reactions use energy from sunlight to produce ______ and _____. Ø These reactions take place within the _____ membranes of the chloroplast.

Lesson Overview Photosynthesis: An Overview Light-Dependent Reactions Ø _______ is required as a source of electrons and hydrogen ions. ____ is released as a byproduct.

Lesson Overview Photosynthesis: An Overview Light-Independent Reactions Ø Plants absorb ________from the atmosphere and complete the process of photosynthesis by producing ____ and other ________. Ø During _______________, ATP and NADPH molecules produced in the light-dependent reactions are used to produce high-energy sugars from carbon dioxide.

Lesson Overview Photosynthesis: An Overview Light-Independent Reactions Ø _____is required to power the light-independent reactions. Ø The light-independent reactions take place outside thylakoids, in the _____.