The largest sperm in the biological world

Introduction
The size of sperm can vary greatly across different organisms. Some organisms have incredibly small sperm, while others have much larger sperm. In this case, we are looking for the organism with the largest sperm among the options provided.

Ginkgo
Ginkgo is a deciduous tree that is known for its fan-shaped leaves. It is considered a living fossil because it is the only surviving member of its plant family. However, when it comes to the size of its sperm, Ginkgo does not have the largest sperm in the biological world.

Mango
Mango is a tropical fruit that is widely consumed and loved for its sweet taste. While mango trees produce large fruits, their sperm is not the largest in the biological world either.

Pinus
Pinus, commonly known as pine trees, are coniferous evergreen trees. They are widely distributed across the world and are known for their needle-like leaves. However, pine trees do not have the largest sperm.

Cycas
Cycas, also known as cycads, are ancient seed plants that resemble palm trees. They have a long fossil history dating back millions of years. Among the options provided, Cycas has the largest sperm in the biological world.

Conclusion
In conclusion, among the options given, Cycas has the largest sperm in the biological world. Cycas is an ancient seed plant with a long fossil history, and its sperm is significantly larger compared to the sperm of Ginkgo, Mango, and Pinus. Understanding the diversity in sperm size across different organisms gives us insight into the vast range of reproductive strategies in the natural world.