Photosystem II

Q. Where are the protons and $O_2$ formed likely to be released – in the lumen or on the outer side of the membrane?

Q.

How one molecule of NADH gives rise to 3 molecules of ATP and One molecule of FADH2 produces two molecules of ATP. As they are only present for up taking H+ and releasing it in? I couldnt understand?

Q.

The primary electron acceptor of PSII is

1. FeS

2. Fd

3. Plastocyanin

4. Pheophytin

Q.

Golgi Apparatus is absent in:

1. Liver cell

2. Blue-green algae

3. Lower plants

4. Higher plants

Q. What happens during the light phase of photosynthesis?

1. ADP is hydrolysed and NADPH oxidised
2. ADP is phosphorylated and NADP reduced
3. ATP is hydrolysed and NADPH oxidised
4. ATP is hydrolysed and NADP reduced

Q. What is the significance of proton gradient in photosynthesis?

Q. In electron transport chain, when $FAD{H}_2$ is oxidized to $FAD$, the electrons are passed to cytochrome proteins where as hydrogen ions are released into:

1. Matrix
2. Cytosol
3. Outer membrane
4. Perimitochondrial space

Q. The scheme of transfer of electrons starting from the PS II to the reduction of NADP+ is called

1. Z-scheme
2. non-cyclic photo-phosphorylation
3. cyclic photo-phosphorylation
4. none of the above

Q.

Question 49
The entire process of photosynthesis consists of a number of reactions. Where in the cell do each of these take place?
(a) Synthesis of ATP and NADPH ............... .
(b) Photolysis of water ............. .
(c) Fixation of $C{O}_2$ .............. .
(d) Synthesis of sugar molecule ............... .
(e) Synthesis of starch .................. .

Q.

ATP can be formed through substrate-level phosphorylation and this process requires

1. an input of energy

2. a high-energy phosphate group that is transferred directly to ADP

3. a concentration gradient of protons

4. the protein ATP synthase

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. In a crop field, a weedicide is used to remove weeds in order to increase the yield but the effect of this weedicide blocks electron transport from photosystem II to photosystem I. This will result in

1. enhancement of dark reaction
2. failure of ATP synthesis
3. lack of reduction of NADP+
4. (b) and (c) above.

Q. DCMU kills the weed because it inhibits:

1. Non cyclic Phosphorylation
2. Dark Reaction
3. Photorespiration
4. Cyclic Photophosphorylation

Q. From where does PQ get its protons?

1. Lumen of thylakoid
2. Membrane of thylakoid
3. Stroma of chloroplast
4. Within the photosystem

Q. Which of the following statements about Photosystem II is correct

1. Has P700 at its reaction center
2. does not have a reaction center
3. Is reduced by NADPH
4. Passes electrons to Photosystem I

Q.

Question 16.1
$2H_{2}O\to 4H^{+}+O_2+4e^{-}$
Based on the above equation, answer the following questions
(a) Where does this reaction take place in plants?

(b) What is the significance of this reaction?

Q. (a) How water is transported to various parts of the plant. Is the water movement active, or is it still passive?

Q.

Question 06
Energy required for ATP synthesis in PS II comes from
(a) proton gradient (b) electron gradient
(c) reduction of glucose (d) oxidation of glucose

Q. Who is better imbibent gelatin or agar?

Q. When cell converts light energy into chemical energy, which of the following reactions would take place?

Q. Read the assertion and reason carefully to mark the correct option in question.

Assertion: The whole scheme of transfer of electrons, starting from the $PSII$ uphill to the acceptor, down the electron transport chain to $PSI$, excitation of electrons, transfer to another acceptor, and finally downhill to $NAD{P}^{+}$ causing it to be reduced to $NADPH+H^{+}$ is called the $Z$ scheme or cyclic photo-phosphorylation.

Reason: Both $ATP$ and $NADH+H^{+}$ are synthesised by this kind of electron flow.

1. If both assertion and reason are true and the reason is the correct explanation of the assertion.
2. If assertion is true but the reason is false
3. If both assertion and reason are true but the reason is not the correct explanation of the assertion.
4. If both assertion and reason are false

Q. In Photosystem II , the active chlorophyll is

1. $P_{680}$
2. $P_{700}$
3. $P_{673}$
4. $P_{720}$

Q. The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is:

1. Plastoquinone
2. Cytochrome
3. Iron -sulphur protein
4. Ferredoxin

Q. In Photosystem II , the active chlorophyll is

1. $P_{680}$
2. $P_{700}$
3. $P_{673}$
4. $P_{720}$

Q. Antenna pigment molecules transfer the light energy to the reaction centre of light harvesting complex. This phenomenon is called as:-

1. Shifting of light
2. Resonance transfer
3. Inductive resonance
4. Charge seperation

Q. The light-dependent reaction begins with

1. Photosystem I
2. Photosystem II
3. Plastoquinone
4. Plastocyanine

Q. Assertion :The proton gradient results in movement of protons across the membrane to stroma through the transmembrane channel of the $F_0$ of the ATPase. Reason: This proton gradient leads to release of energy

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Which of the following statements about Photosystem II is correct

1. does not have a reaction center
2. Is reduced by NADPH
3. Passes electrons to Photosystem I
4. Has P700 at its reaction center

Q. The scheme of transfer of electrons starting from the PS II to the reduction of NADP+ is called

1. Z-scheme
2. non-cyclic photo-phosphorylation
3. cyclic photo-phosphorylation
4. none of the above

Q. Electron form excited chlorophyll molecule of the photosystem II are accepted first by

1. Ferredoxin
2. Cytochrome-b
3. Cytochrome-f
4. Quinone