Page 2 - Cl6-Bio_CBQ_Movements in the body

d) The hardness he felt while pressing his fingers against the top of his head was due to the
presence of ball and socket joint
6. Which of these joints allows movement in all directions?
a) Hinge joint

b) Ball and socket joint
c) Pivot joint
d) Fixed joint
7. Birds fly in the air and walk on the ground. Some birds like ducks and swans also swim in water.
The birds can fly because their bodies are well suited for flying. Their bones are hollow and light.
The bones of the hind limbs are typical for walking and perching. The bony parts of the
forelimbs are modified as wings. The shoulder bones are strong. The breastbones are modified
to hold muscles of flight which are used to move the wings up and down. Birds have a
streamlined body, which makes it easy for them to move through the air.

a) The bones of the hind limbs in the birds are typical for _________ and ________.
i. Walking and flying

ii. Flying and perching
iii. Perching and walking
iv. walking and swimming
b) How is a bird’s body adapted for flying?
c) What is a streamlined shape?
d) How are bones of bird modified to move wings up and down?

8. Identify the following parts of the skeleton-

9. Joints in the human body are connections where two or more bones meet, allowing for
movement and stability. There are different types of joints, classified by their structure.

How does the design of joints reflect the activities they help perform? Use at least two joints to
explain.

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