The correct answer is 'Only anaerobic respiration would take place'.
Photosynthesis is a biological process through which plants synthesize their own food and oxygen is evolved as a byproduct. With the help of this oxygen living organisms are able to cellular respiration. Electron transport chain is a part of cellular respiration in which oxygen acts as ultimate electron acceptor. If oxygen is not available then a negative feedback loop will stop cellular respiration. But, in the absence of photosynthesis no oxygen will be evolved which means that cellular respiration will not occur. In such circumstances, only anaerobic respiration would take place and only those organisms will survive which are either obligate anaerobes or facultative anaerobes.
