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Looking at Skeletons

Testing knowledge of skeletons and bones

Key stage:  KS 2

Curriculum topic:  Animals, including Humans

Curriculum subtopic:  Skeletons and Muscles

Difficulty level:  

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QUESTION 1 of 10

Inside your body there is a framework of bones. This is your skeleton - without it you wouldn't be able to move and your body would be an unattractive soft heap on the floor. Many other types of animals have skeletons too that are similar to ours.

 

Not all bones are the same. A bird's bones can be very light and fragile, the bones of a fish can be very flexible. Bones differ according to the different jobs they do. A leg bone that has to support a lot of weight will be big and strong, for example. There are many animals that don't have bones at all. Can you think of some examples?

In this worksheet you can try out your knowledge of bones and skeletons.

Are all bones the same size and shape?

yes

no

Does your skeleton ever change?

yes

no

Which of these animals do NOT have skeletons inside their bodies?

Jellyfish

Snakes

Spiders

Insects

Fish

Frogs

Crabs are another example of animal with a hard outer case but no bones. Sometimes if you walk along a beach you might find an old, discarded crab shell. Why do you think crabs have to shed their outer cases every so often?

the old case gets worn out

crabs like to have shiny new cases

the case doesn't grow so the crab needs a new one as it gets bigger

the crab shrinks inside the old case

Birds have bones that are very light and hollow. Why do you think this is?

Birds don't have a proper diet for growing healthy bones

Birds have a disease that eats out the inside of their bones

Lightweight bones make it easier for the birds to fly

Birds sing by passing air through their hollow bones

What is the name for an animal that doesn't have a backbone?

inebriated

inverted

invertebrate

involuntary

  • Question 1

Are all bones the same size and shape?

CORRECT ANSWER
no
EDDIE SAYS
If you take a look at your body it is obvious that there are many different kinds of bone. You might not be able to see them directly but it is clear that the bones in your fingers must be different from the big bones in your legs for example!
  • Question 2

Does your skeleton ever change?

CORRECT ANSWER
yes
EDDIE SAYS
Your skeleton keeps growing, getting bigger and stronger, up until the age of around 20, by which time it is full adult size.
  • Question 3

Which of these animals do NOT have skeletons inside their bodies?

CORRECT ANSWER
Jellyfish
Spiders
Insects
EDDIE SAYS
Spiders and insects have a hard outer casing to protect them but no bones. Jellyfish are soft and have no hard parts at all. Snakes are very flexible, but they do have skeletons.
  • Question 4

Crabs are another example of animal with a hard outer case but no bones. Sometimes if you walk along a beach you might find an old, discarded crab shell. Why do you think crabs have to shed their outer cases every so often?

CORRECT ANSWER
the case doesn't grow so the crab needs a new one as it gets bigger
EDDIE SAYS
A crab's hard outer case doesn't grow, so as the crab gets bigger its shell eventually becomes too small for it. The crab sheds the old shell and grows a new one.
  • Question 5

Birds have bones that are very light and hollow. Why do you think this is?

CORRECT ANSWER
Lightweight bones make it easier for the birds to fly
EDDIE SAYS
Birds are adapted to weigh as little possible, making it easier for them to fly. The feathers of some birds actually weigh more than their skeletons.
  • Question 6

What is the name for an animal that doesn't have a backbone?

CORRECT ANSWER
invertebrate
EDDIE SAYS
Animals that don't have a backbone are called invertebrates. Most animals are invertebrates, including insects, spiders, shellfish, worms, snails and centipedes.
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