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Lesson ⁦1-2⁩: Classifying Living Things

Science · Fourth Grade, Primary · Unit 1: Kingdoms of Living Things · First Semester

A 10-question quiz; after every question you'll see the right answer with an explanation.
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What will you learn in this lesson?

There are millions of kinds of living things on Earth, so scientists group them by their shared traits. In this lesson you learn the levels of classification from kingdom to species, the main kingdoms, and the scientific name.

  • Explains why scientists classify living things into groups
  • Orders the levels of classification from kingdom to species
  • Classifies familiar living things into their kingdoms, such as the palm tree in the plant kingdom and the falcon in the animal kingdom
  • Describes the two-part scientific name

💡 Tip: Memorize the order of the levels: kingdom, phylum, class, order, family, genus, species. And remember that the number of organisms decreases and their similarity increases as you move down toward species.

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Worked examples from the Classifying Living Things lesson questions

Why do scientists classify living things into groups?
  • To make them easier to study and to know how they are alike and different
  • So that their traits change
  • So that their numbers increase
  • So that they live in one environment
✓ To make them easier to study and to know how they are alike and different
Classification puts similar living things together in groups, which makes them easier to study and identify.
What is the largest group in the system for classifying living things?
  • The kingdom
  • The species
  • The genus
  • The family
✓ The kingdom
The kingdom is the largest level of classification and includes huge numbers of living things; it then branches into smaller groups.
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What is the smallest level of classification, whose members are very similar?
  • The species
  • The kingdom
  • The phylum
  • The class
✓ The species
The species is the smallest level of classification, and its members are very much alike.
What is the correct order of the levels of classification from largest to smallest?
  • Kingdom → phylum → class → order → family → genus → species
  • Kingdom → class → phylum → order → genus → family → species
  • Species → genus → family → order → class → phylum → kingdom
  • Kingdom → phylum → order → class → family → species → genus
✓ Kingdom → phylum → class → order → family → genus → species
The levels of classification start with the kingdom, which is the largest, then phylum, class, order, family, and genus, and the smallest is the species.
As we move from the kingdom toward the species in the levels of classification, the living things in each group:
  • Become fewer and more similar
  • Become more numerous and less similar
  • Become fewer and less similar
  • Stay the same in number
✓ Become fewer and more similar
Smaller groups contain fewer living things, but they are more similar to each other.

FAQ about the Classifying Living Things lesson

What are the levels of classifying living things, in order?

From largest to smallest: kingdom, then phylum, then class, then order, then family, then genus, then species. A kingdom includes the largest number of organisms, while members of a species are very similar.

What does the scientific name of a living thing consist of?

It consists of two parts: the first is the genus name and the second is the species name. Scientists all over the world use it so that local names don't get mixed up.

How do I study the lesson Classifying Living Things and test myself on it?

Start the lesson quiz on Study with Ghada: 10 questions from the Science Fourth Grade, Primary question bank. After each answer you'll see the right answer with an explanation, and any questions you miss move to “Review my mistakes” until you master them.

Are Study with Ghada quizzes free and aligned with the curriculum?

Yes, completely free. They're built on the Science - Grade 4 - Semester 1 lessons in the same order as the book, and every question is reviewed and approved by a teacher before students see it.

Unit 1 lessons: Kingdoms of Living Things

⁦1-1⁩ Cells All Science Fourth Grade, Primary lessons →
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