Answer:
ATP synthesis will diminish or decrease, whereas oxygen consumption will most probably stay the same.
Step-by-step explanation:
Uncoupler is an agent which which has the ability to disrupt oxidative phosphorylation in mitochondria and prokaryotes and also disrupts photophosphorylation in chloroplasts and cyanobacteria by detaching the reactions of ATP formation from the electron transport chain or ETP.
So, in the presence of uncoupler, ATP synthesis will decrease but it will most probably do not effect oxygen consumption.