What would be most likely to happen if some of the proteins in one of the photosystems were to change shape due to a drop in cell ph? a. an increase in sugar production b. a decrease in chlorophyll production c. a decrease in the formation of nadph d. an increase in the formation of nadp+

apex !!

c.a decrease in the formation of nadph .

The right answer is- C. A decrease in the formation of NADPH.

Photosystem II ( P700) and photosystem I ( P680) are associated with the light dependent phase of photosynthesis.

There are several proteins ( such as pheophytin, the first electron acceptor in the light dependent phase) associated with these system and work on optimum pH.

Light dependent phase is the first stage in which chlorophyll absorbs solar energy and convert it into chemical energy (ATP and NADPH).

ATP and NADPH is further utilized in the calvin cycle ( light independent phase, which is the next phase of photosynthesis) in order to synthesize food ( glucose, which is a carbohydrate).  

If some proteins in one of the photosystems undergo change in their shape due to a drop in pH of cell, they will not perform their activity.

Due to this, there will be a decrease in the formation of NADPH ( that is less reduction of NADP due to blockage in the transport of electron).

Thus, option C) is the right answer.