NCERT Solutions for Class 6 Science Chapter 8 Body Movements PDF

NCERT Solutions for Class 6 Science Chapter 8 Body Movements Exercise Questions Page Number: 78 1. Fill in the blanks. (a) Joints...

NCERT Solutions for Class 6 Science Chapter 8 Body Movements Exercise Questions Page Number: 78 1. Fill in the blanks. (a) Joints of the bones help in the ——————— of the body. (b) A combination of bones and cartilages forms the _______ of the body. (c) The bones at the elbow are joined by a ______________________ joint. (d) The contraction of the _____________ pulls the bones during movement. Solution: (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 hinge joint. (d) The contraction of the muscles 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. ( ) (b) The cartilages are harder than bones. ( ) (c) The finger bones do not have joints. ( ) (d) The forearm has two bones. ( ) (e) Cockroaches have an outer skeleton. ( ) Solution: a) False b) False c) False d) True e) True 3. Match the items in Column I with one or more items of Column II. Solution: Column I Column II Upper jaw Have fins on the body  NCERT Solutions for Class 6 Science Chapter 8 Body Movements 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 Solution: Column I Column II Upper jaw Is an immovable joint Fish Have fins on the body, have a streamlined body Ribs Protect the heart Snail Has an outer skeleton and 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? (b) Which of the skull bones are movable?  NCERT Solutions for Class 6 Science Chapter 8 Body Movements (c) Why can our elbow not move backwards? Solution: a) The rounded end of one bone fits into the cavity (hollow space) of the other bone. Such a joint allows movements in all directions, which is called a ball and socket joint. b) Lower jaw c) Our elbow cannot move backwards because it has hinge joints which only allow back-and forth-movement.