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1 Review Why are pigments such as chlorophyll needed for photosynthesis Predict How well would a plant grow under a pure yellow light- Explain 2 Review.

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Presentation on theme: "1 Review Why are pigments such as chlorophyll needed for photosynthesis Predict How well would a plant grow under a pure yellow light- Explain 2 Review."— Presentation transcript:

1 1 Review Why are pigments such as chlorophyll needed for photosynthesis Predict How well would a plant grow under a pure yellow light- Explain 2 Review What is the function of NADPH Infer How would photosynthesis be affected if there were a shortage of NADP+ in the cells of plants. 3 Visual Thinking Draw two leaves- one green and one orange. Show which colors of visible light are absorbed and which are reflected by each leaf.

2 CH 8 PHOTOSYNTHESIS 8.2 Photosynthesis: An Overview

3 Light  Energy from the sun travels to Earth in the form of light  Sunlight is a mixture of different wavelengths  Some are visible to us some are not.

4  Pigments  Light absorbing molecules that gather the sun’s energy  Chlorophyll  Plants primary pigment.

5 Chlorophyll  Two types  Chlorophyll a and chlorophyll b  Absorb blue-violet and red regions of the spectrum  They appear green.

6 Carotene  Red orange pigment  Secondary pigment, chlorophyll hides it most of the year  Chlorophyll breaks down earlier in the fall which gives leaves the fall colors.

7 Chloroplasts  Organelle where photosynthesis occurs  Thylakoids  Saclike photosynthetic membranes in chloroplasts  Grana  Interconnected stacks of thylakoids  Stroma  Fluid portion outside of the thylakoids.

8 Energy Collection  Chlorophyll absorbs light and is transferred to electrons.

9 High-Energy Electrons  Are highly reactive and require a special “carrier”  Carriers include:  NADP +  Accepts and holds two high-energy electrons, along with a hydrogen ion (H + )  Turns into NADPH which carries the electrons.

10 Photosynthesis Steps  “Plant” absorbs light energy and takes in CO 2 and H 2 O  “Plant” releases O 2 and makes sugar (glucose C 6 H 12 O 6 ).

11  Photosynthesis involves two sets of reactions  Light-dependent reactions  Light-independent reactions.

12 Light-Dependent Reactions  Use energy from sunlight to produce ATP and NADPH  Occurs in Thylakoid  Requires water and releases oxygen.

13 Light-Independent Reactions  ATP and NADPH molecules produce high-energy sugars from carbon dioxide  Light is not needed  Occurs OUTSIDE of thylakoid but IN stroma.


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