PHOTOSYNTHESIS
LIGHT DEPENDENT REACTIONS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Plastoquinone
|
|
|
Ferredoxin
|
|
|
Cytochrome complex
|
|
|
Plastocyanin
|
Detailed explanation-1: -(a) cyclic photophosphorylation, dependent on PS I and catalyzed by the chloroplast flavoprotein [3] depends probably on the cytochrome f reductase acti-vity of this enzyme. Plastoquinone is not involved.
Detailed explanation-2: -NADPH formation does not take place in cyclic photophosphorylation. In this pathway, only a single molecule of ATP is synthesised.
Detailed explanation-3: -This process usually takes place in the thylakoid membrane and uses Photosystem I and the chlorophyll P700. During cyclic photophosphorylation, the electrons are transferred back to P700 instead of moving into the NADP from the electron acceptor.
Detailed explanation-4: -Photolysis of water does not take place. There is no evolution of oxygen takes place because it is not connected with photolysis of water. Cyclic photophosphorylation produces ATP only. It does not involve the formation of NADPH.