Photosystem II

Q.

In PS-II, the first known electron acceptor is

1. Cytochrome

2. Pheophytin

3. FRS

4. PQ

Q.

Energy required for ATP synthesis in PS II comes from

1. Electron gradient

2. Reduction in glucose

3. Oxidation of glucose

4. Proton gradient

Q.

Electrons from an excited chlorophyll molecule of photosystem II are accepted first by

1. Ferredoxin

2. Cytochrome b

3. Pheophytin

4. Cytochrome 7

Q.

Read the following four statements A, B, C and D, and select the right option having both correct statements.

Statements:

(A) Z scheme of light reaction occurs in the presence of PS I only.

(B) Only PS I is functional in cyclic photophosphorylation.

(C) Cyclic photophosphorylation results in the synthesis of ATP and NADPH₂.

(D) Stroma lamellae lack PS II as well as NADP.

1. A and B

2. B and D

3. C and D

4. B and C

Q. PS II occurs in

1. appressed part of granal thylakoids
2. appressed and non appressed parts of grana thylakoids
3. stroma
4. stroma thylakoids and non-appressed part of grana thylakoids

Q.

Assertion: Protons or hydrogen ions produced by photolysis of water accumulate in the lumen of thylakoids.
Reason: Photolysis of water takes place in the inner membrane of thylakoids.

1. Both, assertion and the reason are true and the reason is the correct explanation of the assertion.

2. Both, assertion and the reason are true but the reason is not the correct explanation of the assertion.

3. The assertion is true but the reason is false.

4. Both, the assertion and the reason are false.

Q.

Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on

1. Membrane potential

2. Proton gradient

3. Accumulation of Kt⁺ ions

4. Accumulation of Nat⁺ ions

Q.

Why does cyclic phosphorylisation occur?

Q.

In Z scheme in PS1 NADP reduces to NADPH+H, , does the same thing occur in cyclic phosphorylation?? why??

Q. Do the electrons excited from no. of antennae molecules comes back to their ground state one by one. After transfering the energy for the excitation of electron of forward pigment and then so on and so far, and in last of chlorophyll a molecule?

Q.

The primary electron acceptor of PSII is

1. FeS

2. Fd

3. Plastocyanin

4. Pheophytin

Q.

define reaction centre