Ch. 6 Photosynthesis Photosynthesis Mrs. Stewart Honors Biology Central Magnet School

Notes Light Reactions Page 113

Standards CLE Investigate the relationship between the processes of photosynthesis and cellular respiration. SPI Compare and contrast photosynthesis and cellular respiration in terms of energy transformation.

Objectives Identify the reactants and products for the light cycle of photosynthesis Identify the location of the light cycle

Find a Partner

With your partner 1. Define autotrophs and heterotrophs, and give an example of each. 2. How is photosynthesis and energy related to each of those is number 1?

Watch the videovideo Answer the following questions: What are the flowers doing? Why are they doing it?

Photosynthesis light reaction video

Photosynthesis Basics Where does photosynthesis take place? In organelles called chloroplasts.

Chlorophyll Chloroplasts contain the pigment known as chlorophyll

Pigments Absorb different wavelengths of light (colors) Reflect (transmit) what they do not absorb We see what is reflected back.

The Visible Light Spectrum

Absorption of Light by Chlorophyll a and Chlorophyll b

Dogs and Monkeys Together Think – pair - share Why are leaves (plants) green?

Light Reactions Reactants: Products: Light in the form of photons, water, NADP+, ADP, Phosphorous ATP, NADPH, oxygen

What you need to know: Where do the light reactions occur? What is needed? What is created? In the thylakoids that are inside chloroplasts. Light (photons), water ATP & NADPH go on to Calvin cycle; and oxygen that is released.

Discovery – photosynthesis videophotosynthesis video Identify the reactants and products of the light cycle in the video Identify the location of the light cycle in the video

Objectives Identify the reactants and products for the light cycle of photosynthesis Identify the location of the light cycle

Standards CLE Investigate the relationship between the processes of photosynthesis and cellular respiration. SPI Compare and contrast photosynthesis and cellular respiration in terms of energy transformation.

Notes 6.2 Calvin Cycle

Standards CLE Investigate the relationship between the processes of photosynthesis and cellular respiration. SPI Compare and contrast photosynthesis and cellular respiration in terms of energy transformation.

Objectives Compare and contrast the light- dependent and light-independent cycles of photosynthesis in terms of reactants and products Identify the location for the light- independent (Calvin cycle) for photosynthesis

Dogs Tell your monkey where the reactions of photosynthesis will occur in relation to a plant cell

Monkeys Tell your dog the reactants for the light– dependent reactions of photosynthesis

Dogs Tell your monkey the products for the light– dependent reactions of photosynthesis

Monkeys Tell your dog where the light– dependent reactions of photosynthesis occur - specifically

Where does it happen? Two Stages: Light Cycle: Calvin Cycle: Takes place in the thylakoid Takes place in the stroma

Light-Dependent Cycle Reactants: Products: H 2 O and Light energy from the environment NADP + and ADP + from the Calvin cycle. O2 gas – released through stoma ATP and NADPH – to Calvin cycle

Calvin Cycle Reactants: Products: CO2 – from atmosphere ATP & NADPH – from light cycle Sugar & other monomers for macromolecules such as amino acids (proteins) and fatty acids (lipids)

Putting it all together

Making Connections Together How do the light-dependent and light- independent cycles of photosynthesis depend on each other?

Making Connections Together Look in your book on page 120 and find out what “carbon fixation” is. Look up “nitrogen fixation” in your glossary. How are these two similar?

Stomata Stomata (plural) stoma (singular): Specialized cells that create a pore in the leaves that allow air (CO2, O2, water vapor) to come and go.

Diffusion in Action

With your partner – think/pair/share Describe why plant cells may want to close their stoma.

Discovery – photosynthesis videophotosynthesis video Identify the reactants and products of the light-independent (Calvin) cycle in the video Identify the location of the light- independent (Calvin) cycle in the video

Objectives Compare and contrast the light- dependent and light-independent cycles of photosynthesis in terms of reactants and products Identify the location for the light- independent (Calvin cycle) for photosynthesis

Standards CLE Investigate the relationship between the processes of photosynthesis and cellular respiration. SPI Compare and contrast photosynthesis and cellular respiration in terms of energy transformation.

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