One of the following is not green algae

Explanation

The correct answer is Kelps. Kelps are classified as brown algae, not green algae, and belong to the class Phaeophyceae. They are large, multicellular algae found in marine environments and are known for forming kelp forests. In contrast, Ulva, Volvox, and Chlorella are all examples of green algae, characterized by their green color due to the presence of chlorophyll a and b. These green algae can be found in both freshwater and marine environments, but they do not belong to the same group as kelps.