Which of the following statements are correct with respect to a bioreactor?
i) It can process large volume of culture.
ii) It provides optimum temperature and pH.
iii) It has an oxygen delivery system.

i , ii and iii

All three statements regarding a bioreactor are generally correct:

i) Bioreactors are designed to handle large volumes of culture or microbial cells. These volumes can vary based on the size and capacity of the bioreactor, ranging from small-scale laboratory reactors to industrial-scale units capable of processing significant quantities of cultures or biotechnological products.

ii) Bioreactors are equipped with control systems to regulate environmental factors such as temperature, pH, agitation, and nutrient supply. Maintaining optimal conditions for microbial growth, enzyme production, or other bioprocesses is essential for maximizing productivity, and bioreactors are engineered to provide and sustain these conditions.

iii) Many bioreactors have mechanisms for controlling and regulating oxygen supply to the culture. Oxygen is crucial for aerobic microbial growth and many biological processes, so bioreactors often include systems for proper aeration or oxygenation to support the metabolic needs of the microorganisms or cells within the culture.

Therefore, all three statements regarding a bioreactor - processing large volumes, maintaining optimal temperature and pH, and incorporating an oxygen delivery system - are generally accurate features or capabilities of these biotechnological systems.