Photosynthesis Energy & Life

Autotrophs Autotrophs include organisms that make their own food Autotrophs can use the sun’s energy directly Euglena

Heterotrophs Heterotrophs are organisms that can NOT make their own food Heterotrophs can NOT directly use the sun’s energy

Photosynthesis Overview

Energy Carriers Nicotinamide Adenine Dinucleotide Phosphate (NADP+) Picks Up 2 high-energy electrons and H+ from the Light Reaction to form NADPH NADPH carries energy to be passed on to another molecule

Light Dependent Reactions Occurs across the thylakoid membranes Uses light energy Produce Oxygen from water Convert ADP to ATP Also convert NADP+ into the energy carrier NADPH

Light Dependent Reaction

Light Dependent Reaction

Light Reaction Summary Reactants: H2O Light Energy Products: ATP NADPH 0xygen gas

Light Independent Reaction ATP & NADPH from light reactions used as energy Atmospheric C02 is used to make sugars like glucose and fructose Six-carbon Sugars made during the Calvin Cycle Occurs in the stroma

The Calvin Cycle Two turns of the Calvin Cycle are required to make one molecule of glucose 3-CO2 molecules enter the cycle to form several intermediate compounds (PGA)

The Calvin Cycle

Factors Affecting the Rate of Photosynthesis Amount of available water Carbon Dioxide concentration Temperature Amount of available light energy