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Class 6 (Science ), Chapter 8, Body Movements, Exercise Questions, 1. Fill in the blanks:, (a) Joints of the bones help in the ——————— of the body., ans) movement, (b) A combination of bones and cartilages forms the _______ of the, body., ans) skeleton, (c) The bones at the elbow are joined by a ______________________, joint., ans) hinge, (d) The contraction of the _____________ pulls the bones during, movement., ans) muscles, 2) Indicate true (T) and false (F) among the following sentences., a ) The movement and locomotion of all animals is exactly the same. False, b) The cartilages are harder than bones.-- False, c) The finger bones do not have joints. -- False, d) The forearm has two bones. True, e) Cockroaches have an outer skeleton. -- True, 3) Match the items in Column I with one or more items of 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, shows very slow, movement

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Cockroach, , can fly in the air., , 4. Answer the following:, (a) What is a ball and socket joint?, ans) 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 ball and socket joint., (b) Which of the skull bones are movable?, ans) Lower jaw, (c) Why can our elbows not move backwards?, ans) Our elbow cannot move backwards because it has hinge joints, which only allow back and forth movement.