Explain the photolysis of water during photophosphorylation.

During $Z$ scheme electrons excited by absorption of light in $PSI$ are transferred to the primary acceptors and therefore must be replaced. The replacements come directly from $\underline{ }$

Three cellular processes are listed below, Choose the CORRECT combination of processes that involve proton gradient across the membrane.
$\left(\mathrm{i}\right)$ Photosynthesis
$\left(\mathrm{ii}\right)$ Aerobic respiration
$\left(\mathrm{iii}\right)$ Anaerobic respiration

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:

Identify the labeled parts as $1, 2, 3, 4$ in cyclic photophosphorylation?

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