Module 3- Photosynthesis Flashcards
Photolysis
Th splitting of water into hydrogen and oxygen.
Requires light energy.
What happens in the making of energy in the light dependent stage?
ADP+ Pi - ATP (light energy is required)
This process in called photophosphorylation.
What happens to ATP energy in the light independent stage?
ATP is broken down:
ATP- ADP+Pi+energy (AtPhase + water is required)
This process is called hydrolysis.
Photosynthetic pigment
A coloured biological compound that is present in chloroplasts and photosynthetic bacteria and captures light energy for photosynthesis.
Which wave lengths of chlorophyll are mainly used in photosynthesis?
680 (photosystem II) and 700 (photosystem I)
What does an accessory pigment do?
Acts as an antenna complex for photons of light and transfers them to the reaction centre.
What happens in the reaction centre?
- The light energy excites 2 electrons causing them to be emitted by the chlorophyll.
- The chlorophyll becomes oxidised, the 2 electrons are taken up by the carrier.
What is the equation of reaction in the reaction centre?
Chlorophyll- Chlorophyll (2+) + 2e-
What happens to the electrons after chlorophyll has been oxidised?
Electrons are passed from one carrier to the next in a series of oxidation and reduction reactions, losing energy in the process.
- Energy is used in the synthesis of ATP. ( Non cyclic and Cyclic).
What is the law of limiting factors?
At any given moment, the rate of a physiological process is limited by the factor that is at its least favourable value.
What are the limiting factors in photosynthesis?
Light intensity
Temperature
CO2 concentration
What happens when the temperature is above 25c?
The oxygenase activity of rubisco increase more than its carboxylase activity increases. ( Photorespiration exceeds photosynthesis).
ATP and NADPH are disrupted and water wasted.
Damages proteins involved.
