Bhoojho fell off a tree and hurt his ankle. On examination, the doctor confirmed that the ankle was fractured. How was it detected?

5

(a)

Write the differences between bone and cartilage.

5

(a)

Briefly explain an exoskeleton. Also give examples.

5

(a)

Explain, how do we bend our elbow.

5

(a)

Why is It that we are able to move a few parts of our body easily in various directions and some only in one direction?

5

(a)

In the figure given below, there are two snakes of the same size slithering on sand. Can you identify which of them would move faster and why?

5

(a)

How is the skeleton of a bird well-suited for flying?

5

(a)

Rishi was playing football with his friends. While playing football he fell down and started crying. On seeing him crying, his friends rushed to him and found that he was unable to move his right leg. His friends took him to his house. His father immediately rushed him to a doctor. Doctor diagnosed that his leg was fractured.
(a) Can you suggest, how did doctor diagnose in Rishi's leg?
(b) What do X-rays show us?
(c) What are the values shown by Rishi's friends?

5

(a)

Describe the skeletal system. Write any two functions of it.

5

(a)

Describe the skeleton of a cockroach.

5

(a)