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Photosynthesis and Cellular Respiration •We will examine the exchange of oxygen and carbon dioxide between living things and the environment. Photosynthesis • Definition- the process by which a cell captures energy in sunlight to make food for the cell • ChloroplastOrganelles found only in plant cells that carry out photosynthesis. 2 Stages of Photosynthesis • Stage 1: Capturing the Sun’s Energy • This process occurs mostly in the leaves. • Chloroplasts are the green organelle inside plant cells. They’re green because green light wavelengths are reflected not absorbed but other colors are absorbed. • The main photosynthetic pigment in chloroplasts is chlorophyll! • Stage 2: Using Energy to Make Food • Next, the cell uses the captured energy to produce sugars - the cell needs two raw materials for this stage – Water (H2O) & Carbon Dioxide (CO2) • The root absorbs water from the soil • Then the water moves up through the plant’s stem to the leaves • Carbon Dioxide enters the plant through the small openings on the underside of the leaves called the stoma • Once in the leaves, the water and carbon dioxide move into the chloroplasts Photosynthesis Equation Reactants Product R.A.P. (reactants, arrow, product) Cellular Respiration •Definition- when the chemical bonds of glucose (from photosynthesis) are broken down in the presence of oxygen to produce energy •Mitochondria- Organelles found in plant and animal cells that carry out cellular respiration. Respiration Equation Photosynthesis and respiration are related.