Which substance excludes the nucleus and suspends organelles within the cell?

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The substance described is cytoplasm. It is the jelly-like material inside the cell membrane but outside the nucleus, containing the fluid (cytosol) and the organelles. This environment suspends organelles such as mitochondria and ribosomes, providing the space for most cellular activities to occur. The nucleus sits in its own membrane-bound compartment, so cytoplasm effectively excludes the nucleus while surrounding and supporting the organelles. Protoplasm refers to the entire living contents of the cell (including the nucleus), so it isn’t the specific surrounding substance. Nucleoplasm is the material inside the nucleus, not outside it. Ribosome is an organelle, not the fluid that suspends others.