Photosynthesis Photosynthesis Introduction 2 Light reaction 1 Cell

Cell Energy: Energy for living things comes from food. Originally, the energy in food

Organisms that CANNOT use the sun’s energy to make food—heterotrophs Ex: animals and most

• Organisms that use light energy from the sun to produce food—autotrophs (auto

Photosynthesis is the process by which the energy of sunlight is converted into the

Leaf Anatomy Protects the leaf Where photosynthesis takes place Lets CO 2 in and

More specifically, photosynthesis occurs in the chloroplasts of leaf granum

http: //www. russianflora. com/store/images/product/custom_green_plant_35. jpg The main energy absorbing molecule in chloroplasts is CHLOROPHYLL

http: //www. russianflora. com/store/images/product/custom_green_plant_35. jpg Carotenoids are plant pigments too. These look yellow, orange,

Chlorophyll absorbs mostly red and blue wavelengths of light Red and blue absorbed Green

Two Main Stages of Photosynthesis Light. Dependent Reactions Light-Independent Reactions (Calvin Cycle)

Part 1: Light-Dependent Reaction Occurs in thylakoids/grana Sun’s energy is absorbed & changed into

5 steps of light rxn 1. Light strikes thylakoid & hits chlorophyll causing electrons

5 steps of light rxn 2. Electrons jump from chlorophyll to chlorophyll through thylakoid

3. H 2 O is split by light (photolysis)– electrons are given back to

4. H+ builds up inside thylakoid. 5. H+ pass through transport protein (ATP synthase)

Talk to a Neighbor… Using the following diagram, walk your partner through the 5

At the end of the Light-Dependent Reactions…

Summary of Light Rxn Video clip Using light energy ADP NADP+ H 2 O

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Photosynthesis

Photosynthesis Introduction 2. Light reaction 1.

Cell Energy: Energy for living things comes from food. Originally, the energy in food comes from the sun.

Organisms that CANNOT use the sun’s energy to make food—heterotrophs Ex: animals and most microorganisms

• Organisms that use light energy from the sun to produce food—autotrophs (auto = self) Ex: plants and some microorganisms (some bacteria and protists)

Photosynthetic Organisms are Producers

Photosynthesis is the process by which the energy of sunlight is converted into the energy of glucose

Photosynthesis occurs on plant leaves

Leaf Anatomy Protects the leaf Where photosynthesis takes place Lets CO 2 in and O 2 out

More specifically, photosynthesis occurs in the chloroplasts of leaf granum

Chloroplast Structure:

http: //www. russianflora. com/store/images/product/custom_green_plant_35. jpg The main energy absorbing molecule in chloroplasts is CHLOROPHYLL _______ CAROTENOIDS _______ are plant pigments too. (These look yellow, orange, and red). As chlorophyll dies in the fall, the green color fades and is replaced by http: //www. rnzih. org. nz/images/gardenimages/carrots_d. jpg

http: //www. russianflora. com/store/images/product/custom_green_plant_35. jpg Carotenoids are plant pigments too. These look yellow, orange, and red. As chlorophyll dies in the fall, the green color fades and is replaced by carotenoids http: //www. rnzih. org. nz/images/gardenimages/carrots_d. jpg

Chlorophyll absorbs mostly red and blue wavelengths of light Red and blue absorbed Green is reflected

Photosynthesis Overview

Two Main Stages of Photosynthesis Light. Dependent Reactions Light-Independent Reactions (Calvin Cycle)

Part 1: Light-Dependent Reaction Occurs in thylakoids/grana Sun’s energy is absorbed & changed into chemical energy in ATP & NADPH

5 steps of light rxn 1. Light strikes thylakoid & hits chlorophyll causing electrons become excited.

5 steps of light rxn 2. Electrons jump from chlorophyll to chlorophyll through thylakoid membrane (electron transport chain). NADP+ picks up high energy e- & H+ to become NADPH.