Biology Classification and Identification Concepts

What is the primary purpose of a dichotomous key in biology?

• To organize organisms alphabetically

• To determine the common names of organisms

• To identify unknown organisms based on characteristics

• To classify organisms into broad categories like plants and animals

Why do scientists use scientific names instead of common names for organisms?

• Scientific names are easier to pronounce

• Common names are often too long

• Scientific names are universal and avoid confusion across languages and regions

• Only scientists are allowed to use scientific names

An organism is observed to have cells that contain a nucleus and it obtains food by consuming other organisms. Which of the following best describes this organism?

• Prokaryotic and autotrophic

• Eukaryotic and autotrophic

• Prokaryotic and heterotrophic

• Eukaryotic and heterotrophic

What is a key difference between unicellular and multicellular organisms?

• Unicellular organisms are always autotrophic, while multicellular organisms are always heterotrophic

• Multicellular organisms are generally large enough to be seen with the naked eye and are made of many cells

• Unicellular organisms have cell walls, but multicellular organisms do not

• Multicellular organisms always contain a nucleus, but unicellular organisms never do