Leslie argues that an organism called a Euglena is a plant because it is eukaryotic, has a nucleus, makes its own food, and is unicellular.

Where is Leslie's error?

Plants do not make their own food.

Plants are multicellular.

Plants are prokaryotic.

Plants do not have a nucleus.

Error: Plants are multicellular.

Explanation: Protoctists are known as the dustbin kingdom because they can't be classified as plants, animals or fungi and they are mostly unicellular microorganisms. Some are known to be more plant-like while others are known to be more animal-like. Euglena is not a plant because it's a plant-like protoctist.