Sexual reproduction is oogamous in volvox. Colony may be homothallic or heterothallic. Asexually produced daughter colonies are absent in sexually producing colonies. The reproductive cells are called gantetangia. Gametangia are present in the posterior pole of colony. These cells are larger than the vegetative cells. Gametangia withdraw their flagella.The male gametangia are called antheridium. The protoplast of antheridium divides many times. It produces 16-128 cells. These cells called antherozoid. Antherozoids are elongated and fusiform.More than 128: In this case, antherozoids are arranged in a hollow sphere within the antheridium. They undergo inversion. Then antherozoids separate from each other. Then they arc liberated.

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- Asexual Reproduction in Volvox:-
https://youtu.be/czDWjhBtGmc

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