NCERT Solutions For Class 6 Science Chapter – 8

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NCERT Solutions For Class 6 Science Chapter – 8

 

Q1. Fill in the blanks:

  1. Joints of the bones help in the _________ of the body.
  2. A combination of bones and cartilage forms the _____ of the body.
  3. The bones at the elbow are joined by a ______ joint.
  4. The contraction of the ______ pulls the bone joint.

Solution:-

 

  1. Movement
  2. Skeleton
  3. Hinge
  4. Muscles

 

Q2. Indicate the true and false among the following sentences.

  1. The movement and locomotion of all animals is exactly the same. ()
  2. The cartilage are harder than bones. ()
  3. The finger bones do not have joints. ()
  4. The fore arm has two bones. ()
  5. Cockroaches have an outer skeleton, ()

Answer:-

 

  1. False
  2. False
  3. False
  4. True
  5. True

 

Q3. Match the items in Column 1 with one or more items of Column 11.

Answer:-

 

Column 1 Column 11
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 1 Column 11
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
Cocokroach Has an outer skeleton and can fly in the air.

 

Q4. Answer the following:

  1. What is a ball and socket joint ?
  2. Which of the skull bones are movable ?
  3. Why can our elbow not move backwards ?

Answer:-

 

  1. The rounded end of the bone fits into the cavity (hollow space) of the other bone. Such a joint allows movement in all directions which is called ball and socket joint.
  2. Lower Jaw
  3. Our elbow cannot move backwards because it has hinge joints which only allow back and forth movement.