A single-celled organism is described as?

A single-celled organism is described as?

• A. Multicellular
• B. Unicellular
• C. Colony
• D. Diploblastic

Answer: (B)

Being unicellular means the organism is made of a single cell that carries out all life processes—taking in nutrients, converting energy, responding to the environment, and reproducing—within one cell. In contrast, organisms that are multicellular are composed of many cells that can specialize and form tissues and organs. A colony is a group of individuals living together, but each member remains separate rather than forming one single cell. Diploblastic describes organisms with two germ layers during development, which is about tissue organization, not whether the organism is single-celled or multicellular.

Being unicellular means the organism is made of a single cell that carries out all life processes—taking in nutrients, converting energy, responding to the environment, and reproducing—within one cell. In contrast, organisms that are multicellular are composed of many cells that can specialize and form tissues and organs. A colony is a group of individuals living together, but each member remains separate rather than forming one single cell. Diploblastic describes organisms with two germ layers during development, which is about tissue organization, not whether the organism is single-celled or multicellular.