Which of the following is a product of photosynthesis? A. Water B. Glucose C. Carbon Dioxide D. Sunlight
In addition to sunlight, what are the other reactants for the process of photosynthesis? A. Water and oxygen B. Water and glucose C. Oxygen and carbon dioxide D. Water and carbon dioxide
Pigments of Photosynthesis Pigments are molecules that absorb specific wavelengths (energies) of light and reflect all others. Chlorophyll is the main pigment in charge of capturing the energy from sunlight.
Chlorophyll a absorbs …………….. light best. Chlorophyll b absorbs ……………. light best. Why do plants look green? THEY RELFECT GREEN LIGHT!!!
Electron Carrier Molecule Electron Carrier Molecules Compound that can accept a pair of high energy electrons and transfer them, along with most of their energy to another molecule One way the sunlight can be trapped in a chemical form and use it to build glucose for the plant cell Example: NADP + = accepts and holds 2 high energy electrons along with a hydrogen ion (H + ) When NADP + accepts 2 electrons and a H + it becomes NADPH
Photosynthesis: Step 1 – Light-Dependent Reaction Takes place in Thylakoids. Chlorophyll absorbs light energy from the sun. Water is then split into hydrogen (H) and oxygen (O). The oxygen is released to the atmosphere. Produces NADPH and ATP for the Calvin Cycle (step 2)! H2OH2O IN Sunlight Water ADP NADP+ OUT Oxygen ATP NADPH
Photosynthesis: Step 2 – Light-Independent Reaction Takes place in Stroma. Also called the Calvin Cycle or Dark Reactions. CO 2 (carbon dioxide) combines with hydrogen (H) to form C 6 H 12 O 6 (glucose). The NADPH made in the light- dependent reactions provides the Hydrogen for the glucose The ATP made in light-dependent reactions provides the energy for the Calvin Cycle to occur. IN Carbon Dioxide ATP NADPH OUT Glucose NADP+ ADP
What affects the rate of photosynthesis? Amount of : - sunlight - CO 2 - H 2 O - temperature All the reactions of photosynthesis are controlled by enzymes. Temperatures above or below the optimum temperature will slow down the chemical reactions.