Answer: The correct answer for the blank is Cytoplasm.
Cytoplasm is the fluid filled compartment of the cell. It is present inside the cell membrane. It is a mixture of water, dissolved substances, and cytoskeletal elements. The membrane bound subcellular organelles are present in all eukaryotic cell. These organelles float in this area.
Most of the essential metabolic processes occur in this compartment.
Thus, the correct answer for blank is Cytoplasm.