NCERT Class 6 Science Eighth Chapter Body Movements Solution

NCERT Class 6 Science Eighth Chapter Body Movements Solution

NCERT Class 6 Science Chapter 8 Solution: Dear students Here in this post we are posted Eighth Chapter Body Movements full exercise questions & answer by our arts teacher. This Solution is helpful for CBSE English medium students. Download this 8th Chapter Science solution & prepare your homework.

Q1. Fill in the blanks:-

1. Joints of the bones help in the _movement of the body.
2. A combination of bones and cartilages forms the_skeleton of the body.
3. The bones at the elbow are joined by_ hinge joint.
4. The contraction of the_muscle pulls the bone during movement.

Q2. Indicate true(T) and false (F) among the sentences:-

1. The movement and locomotion of all animals is exactly the same- false.
2. The cartilages are harder than bones- false.
3. The finger bones do not have joints- false.
4. The forearm has two bones- true.
5. Cockroaches have an outer skeleton- true.

Q3. Match the items in column 1 with one or more items of column 2:-

Column 1	Column 2
Upper jaw	Is an immovable joint
Fish	Have a streamed line body, have fins on the body.
Ribs	Protect the heart
Snail	Shows very slow movement
Cockroach	Has an outer skeleton, can fly in air.

Q4. Answer the following:-

1) What is the ball and socket joint?

Ans-  The ball and socket joint is the joint in which the arm is joined with a ball like structure which is part of shoulder. In this the rounded end of bone fits into the cavity of the other bone. This joint allows all the movements. The cavity is the hollow space in which the bone fits.

2) Why can our elbow not move backside?

Ans- We cannot move our elbow backside or turn it backside because the joint in elbow is a hinge joint, the hinge joint bones are allows only back and forth movement. Hence, we cannot move our elbow backside.

More Questions from NCERT Class 6 Science Ch 8 Body Movements

Q1. Do all the animals have same movements and locomotion. Explain?

Ans- All the animals do not have the same exact movement of the body. There is different movement and locomotion for each and every animal as per there behaviour. Some animals walk, some of them fly these are the different movements of the animals which we can observe in nature.

Q2. What is the joint and mention the types of joints?

Ans- When two parts of body are seemed to be joined when we are able to bend or rotate that place is called as joint. E.g. elbow , knee.

There are four types of joints they are as follows:-

1. Ball and socket joints.
2. Pivotal joints.
3. Fixed joints.
4. Hinge joints.

Q3. What is the pivotal joint and the fixed joint?

Ans- Pivotal joints are the joints in which our neck joins the head which allows to bend our head forward and backward and also we can turn right and left. This joint the cylindrical bone can rotate in circular movement.

Fixed joints are the joints which the bones cannot move or don’t have any movement. In our body some joints between bones in head are fixed joints.

Q4. What happens when there is muscle contraction?

Ans- In bones when muscle contraction occurs the muscles get bulged. The muscles when they are contracted it becomes shorter, stiffer and thicker, it pulls the bone when it is contracted with other in that direction. The muscles work pairs. During muscle contraction the one muscle pulls the bone and other muscle relaxes. The other muscle which is relaxed it pulls the bone to its original position.

Q5. By which way we can know that it is a human skeleton?

Ans- Human skeleton in which we can observe the bones of humans in each and every part of organ. If we want to know the skeleton of human or want to see the skeleton of human there is one way called as x-ray. The x-ray images are the one way in which we can observe the skeleton of human and know how the bones are joined in each and every part of the body. This x-ray images are used to find out the injury which in happen to bone. It also show the shapes of bones in our body.

Q6. What is ribcage?

Ans- Ribs are the bones present in chest. The ribs are bent and joined inside the chest. They join the chest bone and back bone together to form a box. This is called as ribcages.

Q7. Describe the backbone of human.

Ans-  Backbone is made up of many small bones which are known as vertebrae. The human backbone consist of 33 vertebrae and it is joined by ribcage. By backbone support we can bend without bending one cannot lift the thing fallen down for this backbone gives the support.

Q8. Explain the movement of earthworms?

Ans- The body of earthworm is made up of the rings which are joined. The earthworm during its movement it extends the front part of the body and keeps the rear portion of the body to the ground. Then it shortens by fixing the front end and releasing the rear end. It shortens the body and pulls the rear end forward, this make it to move forward by small distance. This movement or muscle expansion or contraction is repeated to move in the soil. The earthworms body secretes the slimy substance which helps in the movement of the body.

Q9. Which of the animals movement is to fly?

Ans- In the animals there are many movements according to their different behaviour. The movement of flying is in birds and cockroaches. These fly in air.

Q10. Explain the movement of animals which live in water.

Ans- In water the fishes are there, they have stream lined body which help in movement of the body in water. Fish have fins to make the movement inside water. The shape of fish is in such a way that the water can flow around it easily and allow the fish to move in water. The fishes during swimming they make the curve of front part of body to one side and the tail part swings toward the opposite side. This makes a jerk which pushes the body forward, this jerks help to swim and the it helps the jerks to move fins to tail. Fishes have fins for balancing the body while swimming.

Q11. Draw a neat diagram of pelvic bone.