Variation and Classification 02
A snail has an unsegmented body, that is, one body part.

Variation and Classification 02

This KS3 Science quiz takes a second look at variation and classification. If variations are beneficial and help an animal or plant survive better in their habitat, the individuals with these variations will survive longer and have more offspring, ensuring the variation is passed on again. This is called the evolution of a species. Sometimes, after many generations, the variations that have been passed on mean that the new individuals are very different to the original organisms - a new species has evolved. This is how humans (Homo sapiens) arose from primates (apes, monkeys and early forms of human) that were living in Africa several millions of years ago.

The characteristics of a species are used to classify organisms. A characteristic is a feature such as the number of legs on an animal, or the number of sepals of a flower.

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Scientists always use several characteristics to define a species. Classification was first developed by a Swedish scientist, Carl Linnaeus. He collected and studied many plants and animals, describing their key characteristics in detail. He introduced the binomial (literally meaning 'two name') system where each plant and animal species is given a unique name like Homo sapiens or Panthera leo (lion).

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  1. Which is the odd one out?
    Mosses have no roots and reproduce by spores
  2. How many legs do insects have?
    Anything with more or fewer legs is not an insect
  3. Which is the odd one out?
    Bracken is a fern and reproduces by spores
  4. Which of the following is not an arthropod?
    Arthropods have legs, a mollusc is legless
  5. Which is the odd one out?
    A fir tree is a conifer, it has needle leaves and seeds in cones
  6. What do the following have in common - daffodil, grass and apple tree?
    All hayfever sufferers should get this correct!
  7. Which one of the following is found in water?
    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
  8. Which is the odd one out?
    Fungi have no chlorophyll, so are not green, and cannot make their own food
  9. Which of the following has two body parts, four pairs of jointed legs and no wings?
    Spiders are arachnids. Arachnophobia is a fear of spiders
  10. Which of the following has an unsegmented body?
    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

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