Photosynthesis

Objectives: Standard 1f

• Students will learn that chloroplast organelles inside plant cells capture sunlight energy.

• Students will learn that energy from sunlight is used to power the building of sugar from carbon dioxide and water.

• Photosynthesis

• “Photo”: Light

• “Synthesis”: to build to build organic compounds (sugar)

using light energy to power the reaction

• Photosynthesis

• “Photo”: Light

• “Synthesis”: to build to build organic compounds (sugar)

using light energy to power the reaction

• In plants the major site of photosynthesis is the leaf

• In Plants and Algae (a type of protist) cells photosynthesis occurs in the chloroplast organelles

• General Equation

• Reactants Products

• 2 stages of Photosynthesis:

• *Chemical reactions in both stages are assisted by ENZYMES

• 1) Light Reaction occurs in the Thylakoid of the chloroplast.

• 1) Light Reaction occurs in the Thylakoid of the chloroplast. – Light energy ejects excited electrons from

chloropyll• Electrons replaced by splitting water• 2H2O 4e- +4H+ +O2

– 2 electron transport chains remove energy from excited electrons

• 1st one pumps H+ into thylakoid concentration gradient used to make ATP

• 2nd one collects the excited electron + H+ + NADP+ NADPH (high energy molecules)

• 1) Light Reaction occurs in the Thylakoid of the chloroplast.

• 2) Calvin cycle (A.K.A dark reaction or light independent reaction) occurs in the stroma of the chloroplast.

• Each CO2 adds to a 5Carbon compound

6 Carbon Compound• Takes 2 rounds of the Calvin cycle to make a

glucose molecule – C6H12O6

• 2) Calvin cycle (A.K.A dark reaction or light independent reaction) occurs in the stroma of the chloroplast.

• Each CO2 adds to a 5Carbon compound 6 Carbon Compound

• Takes 2 rounds of the Calvin cycle to make a glucose molecule – C6H12O6

Factors that affect the rate of Photosynthesis:

Factors that affect the rate of Photosynthesis:

Factors that affect the rate of Photosynthesis: