Light- Dependant Photosynthesis

What is the first stage of Photosynthesis?

Photolysis of water

What is Photolysis of water?

A photon of light enters the thylakoid disk and breaks apart a water molecule

What is the equation of photolysis of water?

2H20 = 4e- + 4H+ + 02

What is the second stage of Photosynthesis?

Photoionisation of PSII

What is the first stage of Photoionisation of PSII?

Another photon of light hits an electron in one of the photosynthetic pigments

What are the photosynthetic pigments?

Chlorophyll A and Chlorophyll B

What is the third stage of photosynthesis?

Electron transport chain

What is the first stage of the Electron transport chain?

The energised electron uses energy to pump H+ from stroma into thylakoid disk.

What is the 4th stage of photosynthesis?

Chemiosmosis

What is the first stage of Chemiosmosis?

H+ moves by facilitated diffusion through ATP synthase back into the stroma.

What is the 5th stage of photosynthesis?

Photoionisation of PSI

What is the first stage of Photoionisation of PSI?

More photons of light excite electrons in PSI.

Equation for NADP

NADP + e- + H+ = Reduced NADP

What is the second stage of Photoionisation of PSII?

An electron becomes excited and joins the electron transport chain

What is the second stage of the Electron transport chain?

Once it returns to its original energy level, it joins PSI

What is the third stage of the Electron transport chain?

Moving H+ into the thylakoid disk generates an electrochemical gradient.

What is the second stage of chemiosmosis.

The movement of H+ provides the energy for ATP synthase to phosphorylate ADP into ATP.

What is the second stage of Photoionisation of PS1

These leave the photosynthetic pigments and join the coenzyme NADP along with H+ to form reduced NADP.

First step of Photophosphorylation?

Electron becomes energised by a photon of light and ionises the photosystem to join the electron transport chain

What does Cyclic Photophosphorylation involve?

PSI

Second stage of Cyclic photophosphorylation?

The Movement of H+ and chemiosmosis allows the phosphorylation of ADP into ATP and the electron returns to PSI.

Products of non-cyclic photophosphorylation?

Reduced NADP, ATP, O2

Define Photosynthetic pigments

Pigment that responds to light energy