What happens if you drop hydrogen peroxide on elodea?

Elodea is a perennial aquatic plant that can grow very quickly in almost any body of water, because it is a completely unpretentious plant.

If a few drops of hydrogen peroxide are applied to a leaf of Elodea, then oxygen will begin to evolve, and very rapidly. This process is due to the fact that in the cells of the leaves of Elodea there is a special enzyme called catalase. Under the action of this enzyme, hydrogen peroxide (an unstable substance) decomposes into water and oxygen.

Answer: oxygen is released.