Final answer:
Volvox is part of the phylum Chlorophyta, which consists of green algae. These colonial organisms form coordinated spheres with specialized cells that enable them to move towards light sources.
Step-by-step explanation:
The phylum that Volvox is a part of is Chlorophyta.
This phylum consists of green algae, which includes the fascinating colonial organism called Volvox.
Each Volvox colony is made up of a large number of individual cells ranging from 500 to 60,000.
These cells exhibit a basic level of specialization, with only a few cells being reproductive, responsible for creating new daughter colonies.
The structure of Volvox includes a spherical matrix where the cells, each equipped with two flagella, are interconnected and work in coordination.
This coordinated movement, along with the cells' eyespots that help them sense light, enables the entire colony to move towards light sources, much like multicellular organisms.