JOHN WALSH / SCIENCE PHOTO LIBRARY JOHN WALSH / SCIENCE PHOTO LIBRARY
Light micrograph of a colony of Volvox containing two asexual daughter colonies within & one which has been released. Volvox is an organism that lies between the plant & animal kingdom, being variously classified with the green algae (plant) or flagellates (animal). The colony contains from hundreds to thousands of cells arranged at the surface of a watery matrix. The individual cells have two flagella & eyespots. They reproduce both asexually & sexually. In the former case cells in the rear of the colony divide to form daughter colonies. Once released the parent colony dies. In the latter case male & female gametes are produced & sexual union occurs.
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