Photo.-Light Reactions

Calvin Cycle

- CO2 is taken up and reduced to a carbohydrate. Reduction requires ATP and NADPH. ATP, NADPH Carbohydrate

Light Reactions

- Chlorophyll absorbs solar energy and energizes electrons. Electrons move down electron transport chain. Solar energy ATP, NADPH

What are the three energy conversions that take place during phtosynthesis?

1.Absorption of light energy 2.Conversion of light energy into chemical energy 3.hStorage of chemical energy in the form of sugars

What are two reasons that photosynthesis does not stop with the synthesis of ATP and NADPH?

1ATP and NADPH are not particularly stable compounds. 2.The light reactions do not produce any new carbon compounds that the organism can use to grow.

What is the chemical equation for photosynthesis?

6 CO2 + 6 H2O + energy C6H12O6 + 6 O2 Carbon dioxide + water + solar energy yields glucose and oxygen.

What does the electron transport system do?

A series of membrane-bound carriers that pass electrons from one carrier to another. It brings the energy of the excited electrons down slowly so that some of it can be captured in the form of ATP.High-energy electrons delivered, and low-energy electrons leave.

What happens when a photon hits a phtosystem and excites the electrons?

If you excite a chlorophyll molecule, the energy level of an e- is raised. When the e- returns to its natural energy level, it gives off flourescence and heat.

What breifly happens in the light dependent reactions?

In the light reactions, pigment molecules in the thylakoids absorb light and convert it to chemical energy.

What breiflt happens in the Clavin Cycle?

The energy produced by light reactions is used to make 3-carbon sugars from carbon dioxide in a series of reactions known as the Calvin cycle.

What happens when light hits the phtotsystems in the Thylakoid membrane?

The light-absorbing pigments form two types of clusters, called photosystems (PS) I and II.The chlorophyll and other pigments in each photosystem absorb light energy and transfer it from one molecule to the next. All this energy is funneled to a specific chlorophyll a molecule called the reaction center.

What happens during Light reactions?

chlorophyll and other pigments in the thylakoid: absorb light energy water molecules are split into hydrogen and oxygen light energy is converted to chemical energy which powers sugar production in the Calvin cycle

Draw Light Dependent Reactions

included photosystems, ETCs, STp synthase, Hydrogen pump, and Nadph