This jellylike substance inside the plasma membrane in which all cell organelles are floating is

The correct option is Cytoplasm.

Step-by-step Explanation:

1. Understanding the Cell Structure:
A cell is bounded by an outer membrane called the plasma membrane. Inside this membrane, there is a fluidic, jellylike substance that fills the space and contains various cellular components.

2. Identifying the Jellylike Substance:
The semi-fluid, jellylike matrix present between the plasma membrane and the nucleus is known as the cytoplasm. It serves as the medium where chemical reactions take place and supports the cell organelles (like mitochondria, ribosomes, and the endoplasmic reticulum) which float within it.

3. Analyzing the Other Options:
- Tonoplasm: This is the membrane that bounds the vacuole in plant cells, not the substance inside the plasma membrane.
- Karyoplasm (or Nucleoplasm): This is the protoplasm located specifically within the nucleus of a cell, separated from the cytoplasm by the nuclear membrane.
- Cell sap: This is the fluid contained within the vacuole of a plant cell, consisting of water, nutrients, and waste materials.

Therefore, the jellylike substance containing the organelles suspended within the plasma membrane is the cytoplasm.