Photosynthesis Why is Photosynthesis important Makes organic molecules

Photosynthesis

Why is Photosynthesis important? Makes organic molecules out of inorganic materials. It begins all food chains & webs. All life is supported by this process. It also makes oxygen gas!

Photosynthesis- THE start to food webs!

Photo-synthesis= “making things with light. " Plants use sunlight to turn water and carbon dioxide into glucose. Plants use glucose as food Autotrophs make glucose and heterotrophs are consumers of it.

Photosynthesis Carbon dioxide + water sunlight glucose + oxygen absorbed by chlorophyll 6 CO 2 + 6 H 2 O + energy C 6 H 12 O 6 + 6 O 2

Quick Read Turn to page 103 in your text Read through pages 103 -105 Take some notes on what you read Pay attention to the graphics 1 chloroplast su gh nli t 6 H 2 O granum (stack of thy 2 6 O 2 thylakoid energ stroma (fluid y 6 CO 2 1 six-carb thylakoids) sugar CH O 3 4 6 12

chloroplast Chlorophyll is a molecule that absorbs light energy. • In plants, chlorophyll is found in organelles called chloroplasts. leaf cell leaf

Photosynthesis in plants occurs in chloroplasts. Photosynthesis takes place in two parts of chloroplasts. grana (thylakoids) stroma grana (thylakoids) chloroplast stroma

The light-dependent reactions capture energy from sunlight. – – take place in thylakoids water and sunlight are needed chlorophyll absorbs energy is transferred along thylakoid membrane then to light-independent reactions – oxygen is released

The light-independent reactions make sugars. – take place in stroma – needs carbon dioxide from atmosphere – use energy to build a sugar in a cycle of chemical reactions

The equation for the overall process is: 6 CO 2 + 6 H 2 O C 6 H 12 O 6 + 6 O 2 granum (stack of thylakoids) 1 chloroplast su nli g ht 6 H 2 O thylakoid 6 CO 2 3 6 O 2 2 energy stroma (fluid outside thylakoids) 1 six-carbon sugar 4 C 6 H 12 O 6

Chloroplast Structure Draw and label the thylakoid, granum, stroma, & outer membrane

Step 1 Light Dependent Reaction • • What two things enter step 1? Where does step 1 occur? What two things leave step 1? Why is it called the light dependent reaction?

Step 2 Light independent reaction • What two things enter step 2? • Where does step 2 occur? • What two things leave step 2?

Elodea using photosynthesis What gas do you think is in the bubbles that the plant made?

Plants in Action Glucose

Two Steps of Photosynthesis Light Dependent Reactions (thylakoid) Sunlight is absorbed and converted to chemical energy Water is taken in and broken down into oxygen Chemical energy is temporarily stored in plants as ATP Light Independent Reactions (stroma) CO 2, ATP, make organic compounds 6 CO 2 + 6 H 2 O C 6 H 12 O 6 + 6 O 2

Studying Photosynthesis Know what goes into each step and comes out of each step Know the different structures of the chloroplast Be able to label the diagram on the following slide Watch the following videos: Bozeman Science https: //www. youtube. com/watch? v=g 78 utc. LQr. J 4 Animation with Explanation https: //www. youtube. com/watch? v=w. JDlxp 17 r. Y 4 Crash Course https: //www. youtube. com/watch? v=s. QK 3 Yr 4 Sc_k