NCERT Solutions Class 6 Science Chapter 8

NCERT Solutions for Class 6 Science Chapter 8

NCERT Class 6 Science Chapter 8 teaches students about bones, cartilage, and the formation of the skeleton in the human body. It also describes the skull, backbone, alternate contraction, and locomotion of insects, fish, earthworms, and snails. To help students revise their learning from the chapter and prepare for the exams, there are practise questions given at the end of the chapter. 

Students can refer to NCERT Solutions for Class 6 Science Chapter 8 Body Movements by Extramarks to find detailed answers and explanations to the practise questions. The solutions are prepared by subject matter experts as per the latest guidelines by CBSE. Students can access the solutions on the website and app of Extramarks.

NCERT Solutions for Class 6 Science Chapter 8 – Body Movements

Access NCERT Solutions for Class 6 Science Chapter 8 – Body Movements 

[Solutions]

NCERT Solutions for Class 6 Science – 

NCERT Solutions for Class 6 Science Chapter 8 – Body Movements 

The Class 6 Science Chapter 8 - Body Movements covers the following topics:

8.1 Human Body and its Movements

8.2 Ball and Socket Joints

8.3 Pivotal Joint 

8.4 Hinge Joints 

8.5 Fixed Joints 

8.6 Gait of Animals – Earthworm, snail, cockroach, fish and birds

8.7 How do snakes move?

8.1 Human Body and its Movements 

Each part in the human body system is responsible for performing different bodily functions. An organ is made from a group of tissues that work together for the proper functioning of our body. Human body has an internal framework that is made of bones and cartilage. This framework is called the skeletal system. It provides stability to the body, helping it move. The skull, hip bones, shoulder, chest bone, backbone, shinbone and arm bones are different parts of the skeletal system.

82. Socket and Ball Joints 

As explained in Body Movements Class 6, there are different kinds of joints in human body. When a round end bone connects to another bone through a cavity, this connection is called a ball and socket joint. This joint allows bones to move in every direction.

8,3 Pivotal Joints 

A pivotal joint looks like a ball on a stick. It allows rotation in diagonal and vertical directions. A pivotal joint is present between the backbone and the skull. 

8.4 Hinge Joints 

The hinge joint is very similar to the hinges attached to the door. It can move along a fixed axis and allows extension and flexion in a particular plane. The elbow joint is a hinge joint.

8.5 Fixed Joints 

Fixed joints are where two bones join, but still, movement isn’t possible. An example of a fixed joint is your jaw. When you try moving the upper jaw, only the lower jaw will move. The skull is also an example of a fixed joint.

8.6 Gait of Animals 

The pattern followed by limbs while moving during locomotion on a solid substrate is called gait. Animals use different types of gaits, such as those based on speed, energy efficiency, terrain and need for maneuvering, depending on their body structure.

  • Earthworm 

Earthworms can move with the help of setae. The body of an earthwork is made up of multiple rings that are joined by their ends. As there are no bones in the body of earthwork, it is the muscles that help them extend and shorten when moving forward in short distances.

  • Snail 

The shell of a snail is its outer skeleton and is not made up of bones. A snail moves around with its shell and uses its head for movement. The feet of a snail are thick and made up of strong muscles. It has mucus used as lubrication, which makes the movement easier. Mucus also reduces the risk of injury when a snail passes through sharp objects.

  • Cockroach

Like many insects, cockroaches can also climb and fly. They have six pairs of legs in total, with three pairs on each side. The legs help cockroaches move fast. The outer part of the body of cockroaches has a hard skeleton made of different units, which further helps cockroaches in moving.

  • Fish

A fish has a streamlined body so that it can move freely through water. Its shape also helps in the movement. As the tail and head of a fish are shorter and narrower than its middle body, these help in penetrating through water and moving forward.

  • Birds

Birds have four legs and a pair of wings that help them walk and fly. Birds can fly because of their light and hollow bones. Some birds can also swim. The absence of a urinary bladder also lightens the body and aids in flight.

8.7 How do snakes move?

Snakes move in loops while making a zigzag or ‘S’ pattern. They do not have many bones, but muscles in snakes give them the strength to move. Every loop makes a step, and the snake pushes itself forward. The muscles interconnect with the skin and ribs.

Key Features of NCERT Solutions for Class 6 Science Chapter 8 

If students are looking for explanations or detailed answers to the questions of Chapter 8 Body Movements, NCERT Science Class 6, the students can find them here. The answers are to the point and well-structured, which helps students learn easily. Some of the key features of Chapter 8 Science Class 6 by Extramarks are as follows:

  • The solutions are prepared by subject matter experts in the industry. 
  • These solutions are formatted in such a way that they answer every query of a student. 
  • Difficult answers are explained step-by-step, which reduces mental overload.

Q.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.

Ans-

(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.

Q.2 Indicate true (T) and false (F) among the following sentences.

(a) The movement and locomotion of all the animals is exactly the same. ( )
(b) The cartilages are harder than bones. ( )
(c) The finger bones do not have joints. ( )
(d) The fore arm has two bones. ( )
(e) Cockroaches have an outer skeleton. ( )

Ans-

(a) The movement and locomotion of all the animals is exactly the same. (F)
(b) The cartilages are harder than bones. (F)
(c) The finger bones do not have joints. (F)
(d) The fore arm has two bones. (T)
(e) Cockroaches have an outer skeleton. (T)

Q.3 Match the items in Column I with one or more items of Column II.

Column I Column II
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

Ans-

Column I Column II
Upper Jaw is an immovable joint
Fish have fins on the body skeleton, have a streamlined body
Ribs protect the heart
Snail shows very slow movement
Cockroach can fly in the air, has an outer skeleton

Q.4 Answer the following:

(a) What is a ball and socket joint?
(b) Which of the skull bones are movable?
(c) Why can our elbow not move backwards?

Ans- (a) Ball and socket joint is a type of joint that allows movement in all directions. It is a joint in which a rounded surface of bone moves within a cup-like cavity of another bone. Ball and socket joint is present in shoulder joint and hip joint.
(b) Lower jaw of the skull bone is movable.
(c) Our elbow cannot move backward because it has hinge joint which only allows movement in one plane.

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FAQs (Frequently Asked Questions)
1. How does a fish move in the water?

A fish has a streamlined body with a head and tail narrower than the rest of the body. The tail helps the fish move rapidly in the water.

2. State whether True or False – Two muscles are needed to move a bone.

It’s true because muscles can only pull, but not push. That is why two muscles are needed to move a bone. The contraction of muscles helps the bone move. 

3. What is movement, as explained in Chapter 8 of Class 6 Science?

Movement is the shift in the position of the body or any portion of the body. It is one of the most vital functions of the body. Our day-to-day activities, such as eating, walking, etc., are possible because of movement. 

4. What are body movements?

Any change in the position of a body part in relation to the rest of the body is called body movement. It is one of the most important characteristics of living organisms. Walking, eating and blinking your eyes are examples of body movement.