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Variation and Classification 02

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A snail has an unsegmented body, that is, one body part.

Variation and Classification 02

Classification groups living things so scientists can study them more easily. From mammals to microbes, it helps explain similarities and differences in the natural world.

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Fascinating Fact:

Penguins and ostriches are birds, even though they cannot fly, because they share bird features like feathers and beaks.

In KS3 Science, pupils explore how living organisms are sorted into groups. Classification shows how different species are related and how they adapt to their environments.

Key Terms

  • Genus: A group of closely related species that share common features.
  • Taxonomy: The science of naming, describing, and classifying organisms.
  • Characteristic: A feature or quality used to identify and group living things.

Frequently Asked Questions (Click to see answers)

Why are penguins still classed as birds?

Penguins are classed as birds because they have feathers, beaks, and lay eggs, even though they cannot fly like many other birds.

How do scientists decide which group an animal belongs to?

Scientists look at shared features, such as body structure, reproduction, and genetics, to decide how to group animals into categories.

What is the main purpose of classification in science?

The main purpose of classification is to organise living things so they are easier to identify, study, and compare across different species.

Try These Related Quizzes

1 .
Which of the following is not an arthropod?
Arachnid
Crustacean
Insect
Mollusc
Arthropods have legs, a mollusc is legless
2 .
Which one of the following is found in water?
Algae
Conifers
Ferns
Mosses
Algae have no roots, stems or leaves. Some mosses grow in very wet places like a bog but they float on top of the water
3 .
Which is the odd one out?
Bluebell
Bracken
Grass
Snowdrop
Bracken is a fern and reproduces by spores
4 .
Which is the odd one out?
Algae
Flowering plants
Fungi
Mosses
Fungi have no chlorophyll, so are not green, and cannot make their own food
5 .
Which of the following has an unsegmented body?
Ant
Snail
Wasp
Earthworm
The others all have more than one body part: the ant and wasp are insects with three body parts - head, thorax and abdomen; the earthworm has a segmented body all the way along
6 .
What do the following have in common - daffodil, grass and apple tree?
All produce pollen
No stems
Reproduce by spores
Simple leaves
All hayfever sufferers should get this correct!
7 .
Which of the following has two body parts, four pairs of jointed legs and no wings?
Beetle
Crab
Spider
Woodlouse
Spiders are arachnids. Arachnophobia is a fear of spiders
8 .
Which is the odd one out?
Apple tree
Chestnut tree
Fir tree
Oak tree
A fir tree is a conifer, it has needle leaves and seeds in cones
9 .
Which is the odd one out?
Daisy
Dandelion
Grass
Moss
Mosses have no roots and reproduce by spores
10 .
How many legs do insects have?
6
4 pairs
5 pairs
More than 10
Anything with more or fewer legs is not an insect
You can find more about this topic by visiting BBC Bitesize - Differences in organisms

Author:  Sue Davison (Chemistry Specialist & KS3 Science Teacher, Quiz Writer)
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