Worksheet: Using Classification Keys

In this worksheet, we will practice on how to use classification keys to identify and group a variety of living things.


Scientists classify living things according to their traits.

Which of the following is the correct definition for the word trait?

  • AThe environment an organism lives in
  • BA type of adaptation
  • CA distinguishing characteristic
  • DThe way the organism behaves


Which is the largest kingdom?

  • AAnimals
  • BFungi
  • CProtists
  • DEubacteria


The animal kingdom is divided into two groups, vertebrates and invertebrates.

What is a vertebrate?

  • AAn animal that does not have a backbone
  • BAn animal that has a skeleton
  • CAn animal that has a backbone
  • DAn animal that does not have a skeleton


Identify which group this animal belongs to using the given key.

  • ABird
  • BAmphibian
  • CReptile
  • DFish
  • EMammal

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.