What are the similarities and differences between an algae cell and a higher plant?

Their similarity lies in the fact that they are autotrophs. They also lack vegetative organs. But the difference is that the body is not divided into organs and tissues. Higher plants have organs. Actually, algae is usually understood as a heterogeneous ecological group. These are predominantly photoautotrophic unicellular organisms or colonies. But there are algae and multicellular naturally. Some types of algae are even eaten by humans.