1. Fill in the blanks:
(a) Joints of the bones help in the —Movement—————— of the body.
(b) A combination of bones and cartilages forms the ___Skeleton____ of the body.
(c) The bones at the elbow are joined by a _____hings_________________ joint.
(d) The contraction of the ___muscle__________ pulls the bones during movement.
2. Indicate true (T) and false (F) among the following sentences.
(a) The movement and locomotion of all animals are exactly the same. ( F )
(b) The cartilages are harder than bones. (F )
(c) The finger bones do not have joints. ( F)
(d) The forearm has two bones. ( T)
(e) Cockroaches have an outer skeleton. ( T)
3. Match the items in Column I with one or more items of Column II.
Column I Column II
Upper Jaw have fins on the body
Fish has an outer skeleton
Ribs can fly in the air
Snail is an immovable joint
Cockroach Protect the heart
shows very slow movement
have a streamlined body
Answer:
Column I Column II
Upper Jaw is an immovable joint
Fish have a streamlined body and have fins on the body
Ribs Protect the heart
Snail shows very slow movement
Cockroach has an outer skeleton and can fly in the air
4. Answer the following:
(a) What is a ball and socket joint?
Answer:
- The ball and socket joint allows movement of bone in all direction. For example, Shoulder
(b) Which of the skull bones are movable?
Answer:
- Only the Lower Jaw moves and other bones are fixed with the skull.
(c) Why can our elbow not move backward?
Answer:
- Elbow has a hinge joint that allows only forward and forth movement like a door opening and closing. It does not allow backward movement.
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