Transcript PowerPoints
Photosynthesis and Cell Respiration The Basics Sunlight Powers Life • Certain organisms convert energy from sun to chemical energy in food… – Some make food themselves • AUTOtrophs producers (photosynthesis) – Some rely on others for food • HETEROtrophs consumers ALWAYS starts with the sun Regardless of Photosynthesis or Respiration Working Together • The products of photosynthesis are the chemical ingredients for cellular respiration • The products of cellular respiration are the chemical ingredients for photosynthesis ATP is ENERGY! • Adenosine Tri DiPhosphate P P ATP = Adenosine Tri-Phosphate -Energy needed for cellular work • ATP ADP + P + energy • Energy released used in metabolic activity P ATP Cycle • ATP continuously converted to ADP as cells do work… but cant use ADP… • Recycles! • Page 144 Photosynthesis Direct from the sun The stages of Photosynthesis The Light Dependent Reaction • 3 stages Stage 1: Energy is captured from sunlight • Done by leaves – Contain chloroplasts, chlorophyll (green pigment) » Absorbs blue and red, reflects yellow and green The stages of Photosynthesis The Light Dependent Reaction • Stage 2 Light energy converted into chemical energy • Stored in ATP and NADPH (e- carrier) Chemical NRG ADP ATP Light NRG NADPH NADP+ Stages of Photosynthesis: Light Independent Reaction – Step 3 • NRG stored in ATP and NADPH powers formation of organic compounds (sugars) by using CO2 End products of photosynthesis ARE: Sugar (organic compound) and Oxygen ATP Oxygen Light Reaction and Calvin Cycle Reflection Activity why plants grown in shaded areas produce larger leaves than those grown in direct sunlight? Why Do Leaves Turn Autumn Colors? • Tree and plant leaves contain pigments that give them their color. Three pigments are involved in fall color:· • Chlorophyll (a & b) — gives leaves their green color. • Carotenoids —yellow, orange, brown colors • Anthocyanins — give the red and purple colors. During the growing season, most tree leaves are green because they are full of chlorophyll. Leaves turn different colors in the fall because chlorophyll a & b are not being made! As these pigments dissipate out of the leaves the accessory pigments (other colors) become visible. So…Why do leaves change colors in the fall? Leaves turn different colors in the fall because chlorophyll a & b are not being made! As these pigments dissipate out of the leaves the accessory pigments (other colors) become visible. Photosynthesis Review 1. Is it direct or indirect? 2. What is “Stage 1” a) Where is this happening? b) What pigment absorbs the light energy? 3. What is “Stage 2” a) What is the name of the chemical energy? b) What is “carrying” the electrons? 4. What is “Stage 3” a) What 2 things power the formation of sugar? b) What is the name of the final sugar made? c) What else is made at the end besides sugar?