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Lesson Worksheet: Dichotomous Keys Biology

In this worksheet, we will practice designing and using dichotomous keys.

Q1:

The following statement explains what a dichotomous key is: A dichotomous key is a series of , grouped into pairs, designed to identify an organism by its .

Which word is most appropriate to replace the first blank?

  • ADescriptions
  • BOrganisms
  • CTaxonomic ranks

Which word is most appropriate to replace the second blank?

  • APeers
  • BCharacteristics
  • CGenetics

Q2:

A simple dichotomous key used to identify invertebrates commonly found in gardens is provided. A child finds an organism that has no wings, no shell, and 8 legs. Using this dichotomous key, determine which organism it is most likely to be.

  • AWorm
  • BSpider
  • CSnail
  • DButterfly

Q3:

A simple dichotomous key used to identify invertebrates commonly found in gardens is provided. A child finds an organism that does not have a shell but has wings. Using this dichotomous key, determine which organism it is most likely to be.

  • AButterfly
  • BSpider
  • CSnail
  • DWorm

Q4:

A simple dichotomous key used to identify invertebrates commonly found in gardens is provided. A child finds an organism that has no legs and no wings but has a shell. Using this dichotomous key, determine which organism it is most likely to be.

  • AA Worm
  • BA butterfly
  • CA snail
  • DA spider

Q5:

A simple dichotomous key used to identify different groups of mammals is provided. An organism that gives birth to live young but does not possess a pouch and has no wings is discovered. Using this dichotomous key, determine which group it is most likely to belong to.

  • AChiroptera
  • BPrimates
  • CPlatypoda
  • DEchidnas (spiny anteaters)

Q6:

A simple dichotomous key used to identify groups of vertebrates is provided. An organism that does not have fur but has feathers is discovered. Using this dichotomous key, determine which group it is most likely to belong to.

  • AReptiles
  • BAmphibians
  • CMammals
  • DFish
  • EBirds

Q7:

A simple dichotomous key used to identify groups of vertebrates is provided. An organism that has no fur, feathers nor scales is discovered. Using this dichotomous key, determine which group it is most likely to belong to.

  • AFish
  • BReptiles
  • CAmphibians
  • DMammals
  • EBirds

Q8:

A simple dichotomous key used to identify groups of vertebrates is provided. An organism that has no fur or feathers but is covered in dry scales is discovered. Using this dichotomous key, determine which group it is most likely to belong to.

  • AAmphibians
  • BFish
  • CBirds
  • DReptiles
  • EMammals

Q9:

A simple dichotomous key used to identify different groups of mammals is provided. An organism that does not give birth to live young and is covered in smooth fur is discovered. Using this dichotomous key, determine which group it is most likely to belong to.

  • AEchidnas (spiny anteaters)
  • BChiroptera
  • CPlatypoda
  • DMacropodidae

Q10:

A simple dichotomous key used to identify different groups of mammals is provided. An organism that initially keeps its live young in a pouch and spends the majority of its time on the ground is discovered. Using this dichotomous key, determine which group it is most likely to belong to.

  • APhascolarctidae
  • BMacropodidae
  • CPlatypoda
  • DChiroptera

This lesson includes 27 additional questions for subscribers.

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