The nucleus of a cell is surrounded by a jelly-like substance called:

cytoplasm

The correct answer is Option (1)- cytoplasm

The correct answer is "cytoplasm."

The nucleus of a cell is surrounded by a jelly-like substance called cytoplasm. Cytoplasm is a semi-fluid, gel-like substance that fills the interior of the cell and provides support to the organelles within it. It consists of water, ions, proteins, and various organelles, excluding the nucleus.

To further clarify the other options:

• Deltoid: This term typically refers to a muscle in the human body and is not related to cellular structures.
• Stomata: Stomata are tiny openings or pores on the surface of plant leaves that allow for gas exchange, primarily the uptake of carbon dioxide and the release of oxygen. They are not associated with the nucleus or cytoplasm of animal cells.
• Cell membrane: The cell membrane, also known as the plasma membrane, is a structure that surrounds the entire cell, providing a boundary between the cell's internal environment and the external environment. It is composed of lipids and proteins, and while it is important for cellular integrity, it is not the jelly-like substance directly surrounding the nucleus.