What are the steps of the light dependent reaction of photosynthesis?

Answer 1

1. light energy from the sun hits the thylakoid membrane (of chloroplast), exciting the chlorophyll molecules in photosystem 1 and photosystem 2

2. excited electrons from photosystem 1 drive down the thylakoid membrane and create NADPH from NADP+

3. excited electrons from photosystem 2 drive down the membrane and pull H+ ions into the intermembrane space, these electrons replenish photosystem 1

4. The splitting of H2O forms oxygen gas, which replenishes the electrons from photosystem 2

5. The H+ ions in the intermembrane space have a lot of potential energy, so they go through ATP Synthase- which binds ADP and 1 phosphate to make ATP

The NADPH and ATP formed go on to the Calvin Cycle in the stroma.

Answer 2

As light is absorbed the electrons pass through the pigments. The energy passes through the PEA molecules in the thykaloid membrane. The energy moves through the electron transport chain. The energy has been replenished. Water splitting occurs in the Calvin Cycle. All of the energies are paired with a H plus ion.

Answer 3

Light Dependent Reactions

-light absorbed

-photolysis

-split water

- H2O à O + 2H+ + 2e-

-electrons move down Electron Transport Chain, energy released

-H+ molecules in thylakoid space

-ferrodoxin transfers electrons to NADPH+

-chemiosmosis: H+ moves through concentration gradient

-ATP synthase: spinning

Reactants

Products

Light Energy

NADPH

H2O

ATP

O2 (waste)

Answer 4

The steps of light reaction are as follows:

1. H20 is photolyzed and releases Oxygen and Hydrogen.
2. The Photosystem II absorbs photons and its electrons are excited.
3. These electrons are than transfered to an electron transport chain.
4. In the chain, the electrons are transferred to Plastoquinone, Cytochrome complex and plastocyanin. During this movement of electrons, energy is harvested in form of ATP.
5. Electrons are then transferred to Photosystem I where they are excited again.
6. Than they pass through Sulfur containing proteins and Ferredoxin to reach NADP+ Reductase.
7. This enzyme than reduces NADP+ to NADPH.

The ATP and NADPH harvested during this cycle are necessary for the Calvin cycle, the other main phase of photosynthesis.

For diagrams of the process, check the related links.

Answer 5

1.photosystem 2

2.electron transport

3.photosystem 1

4.hydrogen ion movement

5.ATP formation

Answer 6

Oxygen turns into six part carbon sugars

Answer 7

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