Following is needed in the ionic form during non-cyclic photophosphorylation but not during cyclic photophosphorylations in higher plants.
(1) copper
(2) iron
(3) manganese
(4) zinc
Production of NADPH in a chloroplast takes place during
1. cyclic photophosphorylation
2. non-cyclic photophosphorylation
3. series photophosphorylation
4. substrate level photophosphorylation.
Cyclic photophosphorylation invloves
(1) PS I
(2) PS II
(3) PS I and PS II
(4) P680
Which of the following statement is incorrect?
a. Reaction centre is formed by a group of chl- a molecules.
b. Reaction centre is different in both the photosystems.
c. In PS I the reaction centre chlorophyll a has an absorption peak at 700 nm.
d. In PS II the reaction centre chlorophyll a has absorption maxima at 680 nm.
In photosystem-I, P700 refers to-
1. chl-b
2. chl-a
3. number of pigment molecules
4. absorption peak of chl-a at 700nm.
In chloroplast the movement of electrons from PS-II to electron transport system is-
1. uphill in terms of redox potential scale.
2. downhill in terms of redox potential scale.
3. from one cytochrome to another
4. None of the above.
Electrons in the reaction center of PS-I are excited by-
a. blue light
b. red light
c. green light
d. blue and red light.
Final acceptor in the Z-scheme of light reaction-
1. oxygen
2. NADPH
3. NADP+
4. ferredoxin
In the Z-scheme of light reaction, at how many positions an electron is excited by the light?
1. 1
2. 2
3. 3
4. 4
1. | Light energy excites electrons in the thylakoid membrane electron transport chain. |
2. | Photons are passed along to a reaction-center chlorophyll. |
3. | The P680 chlorophyll donates a pair of protons to NADP+, which is thus converted to NADPH. |
4. | The electron vacancies in P680+ are filled by electrons derived from water. |