RBSE Class 6 Science Important Questions Chapter 8 Body Movement

Rajasthan Board  RBSE Class 6 Science Important Questions Chapter 8 Body Movement Important Questions and Answers.

RBSE Class 6 Science Chapter 8 Important Questions Body Movement

Multiple Choice Questions

Question 1. 
Which of the following helps our body to move?
(a) Bones
(b) Skin
(c) Muscles 
(d) Organs
Answer:
(c) Muscles 

 

Question 2. 
Which of the following organism does not have bones for movement?
(a) Dog 
(b) Snake
(c) Earthworm 
(d) Human being
Answer:
(c) Earthworm 

Question 3. 
Which of the following is true for ribcage?
(a) Protects the underlying lungs, heart and some part of liver.
(b) It is a box which is formed by ribs, the chest bone and backbone together.
(c) It is a cone-shaped structure made up of 12 pairs of ribs.
(d) All of these
Answer:
(d) All of these

Question 4. 
Which of the following is a fixed joint? 
(a) Elbow joint 
(b) Knee joint
(c) Skull joint 
(d) Pelvic joint
Answer:
(c) Skull joint 

Question 5. 
The part of the ear that is made up of cartilage is:
(a) Upper part 
(b) Middle part
(c) Soft lower part 
(d) Inner ear
Answer: 
(a) Upper part 

Fill in the Blanks

Question 1.  
Bones and ................ form the skeleton of the human body.
Answer:
cartilage

Question 2. 
The skeleton of the ................. is covered with strong muscles.
Answer:
fish

Question 3. 
Snails move with the help of ...............  
Answer:
muscles

Question 4. 
The joint where our neck joins the head is a ...............
Answer:
pivotal joint

Question 5. 
The elbow has a ...............  that allows only a back and forth movement.
Answer: 
hinge joint

State whether True or False

Question 1. 
The lower jaw is the only movable bone in the face.
Answer:
True

Question 2. 
A snake does not have a vertebral column.
Answer:
False

Question 3. 
Without bones, it is impossible to move.
Answer:
True

Question 4. 
Earthworms move because of a repetitive contraction and expansion of their muscles.
Answer:
True

Question 5. 
Muscles can only work in pairs in order to cause movement.
Answer: 
True

 

Match the followings

Column I	Column II
1. Backbone	(a) fishes
2. Ball and socket joint	(b) between head and neck
3. Cartilage	(c) below the stomach
4. Fixed joint	(d) shell
5. Hinge joint	(e) movement
6. Muscle	(f) elbow joint
7. Outer skeleton	(g) skull
8. Pelvic bones	(h) outer upper part of ear
9. Pivotal joint	(i) allows movement in all directions
10. Streamlined body	(j) vertebrae

Answer:

Column I	Column II
1. Backbone	(j) vertebrae
2. Ball and socket joint	(i) allows movement in all directions
3. Cartilage	(h) outer upper part of ear
4. Fixed joint	(g) skull
5. Hinge joint	(f) elbow joint
6. Muscle	(e) movement
7. Outer skeleton	(d) shell
8. Pelvic bones	(c) below the stomach
9. Pivotal joint	(b) between head and neck
10. Streamlined body	(a) fishes

Very Short Answer Type Questions 

Question 1. 
Give an example of a pivot joint in the human body.
Answer: 
The joint between the neck and head is a pivotal joint that allows our head to rotate.

Question 2. 
What is cartilage and name three places where they are found in the body?
Answer: 
Cartilage is a soft, gel-like padding between bones that protects joints and helps in movement. It is found in ear lobes, elbows, knees.

Question 3. 
How does an earthworm get grip on ground?
Answer: 
Earthworms have a large number of tiny bristles (hair-like structures) projecting out, under their body. These bristles help to get a good grip on the ground.

Question 4. 
How does the snail move?
Answer:
A snail moves with the help of its strong muscular foot. Its movement is known as crawling.

Question 5. 
Define outer skeleton.
Answer: 
The outer skeleton is also known as the exoskeleton. It is a hard-covering shell of many animals that supports and protects their structure.

Question 6. 
Do snake has bones?
Answer:
Snake has a long backbone inter-connected to the muscles.

Question 7. 
Are bones always required for movement?
Answer: 
No, bones are not always required for movement. An organism can also move with the help of muscles like earthworm.

 

Short Answer Type Questions 

Question 1. 
Describe the main functions of the skeleton system.
Answer: 
The main functions of the skeleton system are as follows:

1. It gives shape and provides support to the body.
2. It provides movement to our body.
3. It protects some internal organizer

Question 2. 
How can a doctor confirm that the bone has been fractured?
Answer: 
Doctors can confirm that bone has been fractured by taking X-ray images of that portion of the body suspected to have an injury. The image so obtained contains information of the shape, structure and number of bones, which helps a doctor to confirm whether it is a fracture or not.

Question 3. 
Bones are hard structures and cannot be bent. But, we can still bend our elbow, knee, etc. Explain how? 
Answer: 
The body is made up of several bones that are joined together. The elbow, knees, etc. are such joints, where two bones meet. Hence, on these points movement is possible.

Question 4. 
Which type of movement would have been possible if:
(a) Our elbow had a fixed joint?
(b) We were to have a ball and socket joint between our neck and head? 
Answer: 
(a) If the elbow had a fixed joint, then we can have up and down movement of the entire hand including shoulders. In such a case, our hand will not be able to bend.
(b) If we have a ball and socket joint between our neck and head, then it would be possible to freely rotate our head even at 360°

Question 5.
Explain the working of muscles. 
Answer: 

1. Muscles work in pairs. When one of them contracts, the bone is pulled in one direction and the other muscle of the pair relaxes.
2. If we need to move the bone in the opposite direction, the relaxed muscle contracts to pull the bone towards its original position while the first one relaxes.
3. Thus, two muscles have to work together to move a bone.

Question 6. 
Explain how does earthworms move without bones?
Answer:
Earthworms do not have bones. It moves with the help of its muscles. During the movement, the earthworm keeps the back portion of its body fixed to the ground and expands the front part of the body. Then it fixes the front part and releases the back portion. This makes it move forward by a small distance.

Question 7. 
Describe the type of movements seen in each of the given animals:

1. Duck
2. Snake 
3. Kangaroo
4. Cock-roach.

Answer: 

1. Duck: Walk, swim, paddle, fly.
2. nake: Glide, slither.
3. Kangaroo: Hop, walk, run.
4. cockroach: Walk, climb, fly.

Question 8. 
How is the skeleton of a bird well-suited for flying?
Answer: 
The skeleton of a bird is very well suited for flying because it has a streamlined body shape with the large chest muscles that help to move its wings up and down. Its bones are hollow which makes its body lightweight and it has feathers that help in flying.

Question 9. 
Describe the gait of a snake.
Answer: 
A snake crawls in a zig-zag motion. During its movement, the snake’s body curves into many loops. Each loop gives it a forward push by pressing against the ground. Since its long body makes many loops and each loop gives it this push, the snake moves forward very fast.

Long Answer Type Questions 

Question 1. 
Explain the various organs of the skeletal system.
Answer: 
The various organs of the skeletal system are:

1. Ribcage: Bones of the chest are called ribs. They join the chest bone in the front and the backbone at the back together to form a box called the ribcage.
2. Backbone: The backbone extends from the base of the skull to the hip. It consists of 33 small rings called vertebrae which are joined from end-to-end.
3. Shoulder bone: The shoulder bone is formed by the collar bone and the shoulder blade. It is attached to the upper part of the ribcage and to the upper arm bone.
4. Pelvic bones: The pelvic bones or the hip bone encloses the portion of our body below the stomach.
5. Skull: It is made up of many bones joined together. It encloses and protects the brain.

 

Question 2. 
Describe different types of joints with respect to their type of motion and examples.
Answer: 
There are four types of joints in the body which are as follows:

1. Ball and socket joint: In this joint, the rounded end of one bone fits into the hollow space of another bone. It allows movement in all directions. For example - the joints between shoulder and the arm, and the joint between thigh and hip.
2. Pivotal joint: In this joint, a cylindrical bone moves or rotates in a ring. It allows many movements like up and down, side to side, etc. For example, the joint between the neck and head is a pivotal joint that allows our head to rotate.
3. Hinge joint: In this joint, the two bones are joined at a point that resembles how a door is joined to the hinges. This joint allows only back and forth movement. For example-knee joint and elbow, joint are hinge joints.
4. Fixed joint: Joints that do not move in any direction are known as fixed joint. For example - the joints between bones in our head do not allow the. movement of bones attached to it. 

Question 3. 
How does a fish swim in water? 
Answer: 
During swimming, the muscles surrounding the skeleton of the fish help in swimming. Fish expands its muscles on one side of its body while relaxing the muscles on the other side. This makes a jerk and moves it forward through the water. Fish use their back fins to make these movements.