Question

if the calvin cycle slows down, what will happen to the rate of o₂ production in ps ii, and why?
o₂ production will slow down because the chloroplast will need less light energy to send to the calvin cycle.
o₂ production will not change because the calvin cycle is a separate process from the light reactions.
o₂ production will not change because light energy will still be absorbed by the pigment molecules and excite the ps ii chlorophyll a pair.
o₂ production will slow down because less nadp⁺ will be regenerated in the calvin cycle.
o₂ production will speed up because not as much nadph will be used in the calvin cycle and so it will accumulate in the chloroplast.
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the light reactions and the calvin cycle are functionally linked by atp and nadph, so slower calvin cycle activity will have an effect on the rate of

Explanation:

The light reactions (where \(O_2\) is produced in PS II) and the Calvin cycle are linked by ATP and \(NADPH\). When the Calvin cycle slows down, less \(NADP^{+}\) (a reactant for the light reactions, as \(NADP^{+}\) is reduced to \(NADPH\) in the light reactions) is regenerated. Since \(NADP^{+}\) is necessary for the electron - transport chain in the light reactions (specifically in PS I, but a slow - down in \(NADP^{+}\) regeneration affects the whole electron flow which is connected to \(O_2\) production in PS II).

Answer:

\(O_2\) production will slow down because less \(NADP^{+}\) will be regenerated in the Calvin cycle.