There are various examples of unicellular plants, and some of them include bacteria, some types of algae such as diatoms and amoeba. Unicellular organisms are simpler and smaller than the multicellular organisms, and they are composed of a single cell in which they perform all their specialized functions. In addition, they are too small to be seen with naked eyes.
The unicellular algae contain chlorophyll that enables them to carry out photosynthesis just like other plants. In addition, they have accessory pigments that help them to absorb light, enabling the organisms to give a variety of colors such as green, red and brown. They also form the base of aquatic food chains.