KS3 Science Quiz - Variation and Classification 01 (Questions)

This KS3 Science quiz takes a look at variation and classification. It is quite easy to recognise your different friends at school. They look different, they sound different and they behave differently. Even 'identical' twins are not perfectly identical. These differences are called variation and occur in all animal or plant species. Some of these variations are caused by genetics and others are environmental. Variations that are caused by the genetics of an individual can be passed on during reproduction.

Variation can also be described as being continuous or discontinuous. An example of a variation that is continuous would be height. The height of an adult can be any value within the normal height range of our species. Someone could be 167.1 cm tall, someone else 163.25 cm tall and so on. Discontinuous variables are those with only certain definite values, for example tongue rolling. Some people can curl their tongue edges upwards but others can't. No one can partly roll their tongue, it is either one thing or the other.

1. Which one of the following shows discontinuous variation?
[ ] Eye colour
[ ] Height
[ ] Strength
[ ] Weight
2. Which one of the following shows continuous variation?
[ ] Blood group
[ ] Height
[ ] Gender
[ ] Tongue rolling
3. Which one of the following is an inherited variation?
[ ] Blood group
[ ] Long hair
[ ] Scar on your knee
[ ] Speaking English
4. Which one of the following is an environmental variation?
[ ] Attached ear lobes
[ ] Eye colour
[ ] Male or female
[ ] Short hair
5. Animals with a backbone are called what?
[ ] Carnivores
[ ] Herbivores
[ ] Invertebrates
[ ] Vertebrates
6. Which of the following animals have a backbone?
[ ] Bee
[ ] Lobster
[ ] Spider
[ ] Trout
7. Which of the following groups is warm blooded?
[ ] Amphibians
[ ] Birds
[ ] Insects
[ ] Reptiles
8. Which of the following groups breathe through moist skin and lungs, and need water to breed?
[ ] Amphibians
[ ] Crustaceans
[ ] Fish
[ ] Reptiles
9. Which group do Seals belong to?
[ ] Amphibians
[ ] Fish
[ ] Mammals
[ ] Reptiles
10. Which is the odd one out?
[ ] Frog
[ ] Lizard
[ ] Newt
[ ] Toad
KS3 Science Quiz - Variation and Classification 01 (Answers)
1. Which one of the following shows discontinuous variation?
[x] Eye colour
[ ] Height
[ ] Strength
[ ] Weight
This is controlled only by genes
2. Which one of the following shows continuous variation?
[ ] Blood group
[x] Height
[ ] Gender
[ ] Tongue rolling
The tallest recorded person was 272 cm tall and the shortest 56 cm tall
3. Which one of the following is an inherited variation?
[x] Blood group
[ ] Long hair
[ ] Scar on your knee
[ ] Speaking English
Inherited variation depends on genes
4. Which one of the following is an environmental variation?
[ ] Attached ear lobes
[ ] Eye colour
[ ] Male or female
[x] Short hair
Environmental variation is not dependent on genes
5. Animals with a backbone are called what?
[ ] Carnivores
[ ] Herbivores
[ ] Invertebrates
[x] Vertebrates
Humans are therefore a vertebrate animal
6. Which of the following animals have a backbone?
[ ] Bee
[ ] Lobster
[ ] Spider
[x] Trout
All the others are invertebrates and their bodies are supported (and protected) by an exo-skeleton (external skeleton)
7. Which of the following groups is warm blooded?
[ ] Amphibians
[x] Birds
[ ] Insects
[ ] Reptiles
Mammals and birds are the only warm blooded groups of animals
8. Which of the following groups breathe through moist skin and lungs, and need water to breed?
[x] Amphibians
[ ] Crustaceans
[ ] Fish
[ ] Reptiles
Frogs are amphibians
9. Which group do Seals belong to?
[ ] Amphibians
[ ] Fish
[x] Mammals
[ ] Reptiles
Mammals give birth to live young and suckle their young
10. Which is the odd one out?
[ ] Frog
[x] Lizard
[ ] Newt
[ ] Toad
Lizards are reptiles, the others are all amphibians