What is the largest cell?

The largest cell in the world is the ostrich egg, while in humans the largest cell is the female egg cell (ovum).

Ostrich Egg as the Largest Cell

The ostrich egg is considered the largest single cell known. It can measure up to 15 centimeters long and weigh over 1 kilogram. Though it looks large and complex, it is still a single cell before fertilization.

Human Egg Cell

In the human body, the female ovum or egg cell is the largest cell. It is about 100 micrometers in diameter, making it visible to the naked eye. This large size allows it to store nutrients needed for early development after fertilization.

Why These Cells are Large

1. Ostrich Egg: Large size helps provide food reserves for the developing chick.
2. Human Egg Cell: Needs to carry nutrients and organelles for the developing embryo until implantation in the womb.

Comparison of Cell Sizes

• Mycoplasma (smallest cell): 0.1 micrometer.
• Red Blood Cell: 6–8 micrometers.
• Sperm head: 4–5 micrometers.
• Human Egg Cell: 100 micrometers.
• Ostrich Egg: Several centimeters.

Conclusion: The ostrich egg is the largest cell in nature, while the largest cell in the human body is the egg cell (ovum).