What is the jelly-like substance inside the cell called?

The jelly-like substance inside the cell is known as cytoplasm. It plays a critical role in supporting and suspending the organelles within a cell, providing a medium where various metabolic reactions occur. Cytoplasm also contains enzymes and the cytoskeleton, which helps maintain the shape of the cell.

While nucleoplasm, another substance, is found specifically within the nucleus of eukaryotic cells, it does not fill the entire cell but rather the space inside the nuclear membrane. Chlorophyll, on the other hand, is a pigment necessary for photosynthesis found in plants but is not a substance that fills the cell. Protoplasm is a more general term that can refer to the entire living content of a cell except the cell wall, which includes both the cytoplasm and nucleoplasm but is not as specific as cytoplasm when discussing the jelly-like material of the cell. Therefore, cytoplasm is the precise term for the substance filling the cell.