Page 3 - Cl6-Bio_CBQ_Movements in the body

10. a) Label the parts of the skeleton given alongside.
b) Differentiate between – Hinge joint and pivotal joint.
c) What would have happened if the backbone had only
one long bone instead of many small bones? Why?

11. The animals A, B, C and D all move without legs. The animal A moves by the alternate
contractions and relaxations of the muscles of its disc-shaped foot. The animal B lives in water
and swims by moving its tail from side to side. The animal C lives in soil and moves by
lengthening and shortening its body segments alternately. The animal D moves forward by
moving its body sideways in the form of many loops. What are A, B, C and D?

12. A traffic policeman stretches out his arm to the right. During this movement –
a) Which of the muscle contracts?
b) Which of the muscle stretches (or relaxes)?
13. a) Identify the types of joints shown in the
alongside figures A & B.
b) Ritu fell and hurt her elbow. The doctor said
she had injured a hinge joint. Explain what a
hinge joint is and where else it is found in the

body.

14. Compare the movement of a snail with that of an earthworm. How are their body structures

suited to their style of movement?
15. Draw and label a ball and socket joint. Mention two examples where it is found in the body.

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