POINT > Define photosynthesis POINT > Define autotroph and heterotroph (again) POINT > Show the equation for photosynthesis POINT > Describe the role of chlorophyll and stomata POINT > Describe 2 stages of photosynthesis

Photosynthesis: the process by which cells capture light energy and use it to make sugars (like glucose) Almost all living things obtain their energy directly or indirectly from the sun POINT > Define photosynthesis

Autotroph: an organism that makes its own food Plants, some protists, and some bacteria are autotrophs POINT > Define autotroph and heterotroph (again)

Heterotroph: an organism that cannot make its own food Heterotrophs must get energy from other organisms animals fungi some protists some bacteria POINT > Define autotroph and heterotroph (again)

CHECK: What is an autotroph? What is photosynthesis? What is a heterotroph? What is diffusion?

During photosynthesis, organisms use light energy to convert carbon dioxide and water into glucose Oxygen is produced as a waste product 6CO 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2 CO 2 and H 2 O are reactants C 6 H 12 O 6 and O 2 are products POINT > Show the equation for photosynthesis

Chlorophyll is the pigment in chloroplasts that absorbs light energy POINT > Describe the role of chlorophyll and stomata

CHECK: What are the products of photosynthesis? What is chlorophyll? What are the reactants of photosynthesis? Where in the cell is chlorophyll?

Stomata are tiny openings in the leaf CO 2 enters the plant through stomata and diffuses into the chloroplasts O 2 leaves through the stomata H 2 O also leaves through stomata (H 2 O enters the plant through the roots) POINT > Describe the role of chlorophyll and stomata

Photosynthesis happens in two stages 1. The light reactions: Chlorophyll captures light energy and uses it to split a water molecule, releasing oxygen (O 2 ) 2. The Calvin cycle: Energy from the light reactions is used to make glucose (C 6 H 12 O 6 ) using carbon dioxide (CO 2 ) POINT > Describe 2 stages of photosynthesis

CHECK: What happens during the light reactions of photosynthesis? What are stomata? What happens during the Calvin cycle?

Homework: Read pages Finish the Study Guide S. A. #1-2 page 90 GRAS pages 44-46