The assimilatory power formed in light reaction of photosynthesis is:

Assertion A: During photophosphorylation protons are transported across the membrane and accumulated inside the lumen.

Reason R: To develop proton gradient, pheophytin transfers electrons to hydrogen carriers instead of electron carrier.

Arrange the path of electrons from water to the phycocyanin in the light reaction.

i) Plastoquinone

ii) Excited ${\mathrm{P}}_{680*}$

iii) Cyt $f$

iv) $\mathrm{Fe}-\mathrm{S}$

v) Pheophytin

vi) Quinone

The correct sequence is

Which of the following are required for chemiosmosis?

I. A membrane

I. A neutron pump

II. An electron gradient

IV. $\mathrm{ATPase}$

The correct answer is:

Assertion $\left(\mathrm{A}\right):$ In $\mathrm{PS} \mathrm{I}$, the reaction centre, chlorophyll 'a' has an absorption peak at $700 \mathrm{nm}$, hence is called $\mathrm{P}700$, while in $\mathrm{PS} \mathrm{II}$, it has absorption maxima at $680 \mathrm{nm}$ and is called $\mathrm{P}680$.

Reason $\left(\mathrm{R}\right):$ Calvin pathways occur in all photosynthetic plants, it does not matter where they have ${\mathrm{C}}_3$ or ${\mathrm{C}}_4$ pathways and the Calvin cycle described in three stages: Carboxylation, reduction and regeneration.

The correct answer is:

The reaction centre in PS II has an absorption maxima at