CBSE Class 6 Science Chapter 8: Body Movements NCERT Solutions

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NCERT Solutions PDF Class 6 PDF

This chapter, "Body Movements," for CBSE Class 6 Science, delves into the fundamental principles of how living organisms move. The NCERT Solutions provide clear explanations and answers to exercises covering the structure and function of the skeletal system, including bones and cartilages. Students will learn about different types of joints like ball and socket and hinge joints, understanding their roles in enabling various movements. The solutions also explore the essential function of muscles in pulling bones and discuss the diverse ways animals like fish, birds, snails, and insects move. This resource is designed to help students grasp the concepts of locomotion and body mechanics, aiding in their preparation for exams by offering step-by-step problem-solving and conceptual clarity.

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Quick info

BoardCBSE
ClassClass 6
SubjectScience
Session2026
LanguageEnglish
TypeNCERT Solutions
ChapterChapter 8

Chapter summary

Chapter 8, "Body Movements," focuses on the mechanics of movement in humans and animals. The NCERT Solutions cover key concepts such as the skeletal system, joints (hinge, ball and socket, immovable), and the role of muscles. It explains how different body parts move and contrasts locomotion in various animals, highlighting adaptations like fins, outer skeletons, and streamlined bodies. The exercises reinforce understanding of bone structure, joint types, and muscle action.

Learning outcomes

  • Understand the role of joints in body movement.
  • Identify different types of joints and their functions.
  • Explain the relationship between bones, cartilages, and muscles in movement.
  • Describe the skeletal structure of the human body.
  • Compare the modes of movement in different animals.
  • Recognize the function of the outer skeleton in insects.

Topics covered

Paper topics

  • Body Movements
  • Bones
  • Cartilage
  • Skeleton
  • Joints
  • Hinge Joint
  • Ball and Socket Joint
  • Immovable Joint
  • Muscles
  • Locomotion in Animals
  • Fish Movement
  • Insect Movement

Important topics

  • Types of Joints (Hinge, Ball and Socket, Immovable)
  • Role of Muscles in Movement
  • Structure and Function of the Skeleton
  • Locomotion in Different Animals
  • Difference between Bones and Cartilage

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Questions and Solutions

Question 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.
Solution: (a) Joints are crucial for enabling the movement of the body. They act as pivot points. (b) The entire framework that supports and protects the body, made up of bones and cartilages, is called the skeleton. (c) The elbow joint is a type of hinge joint, which allows movement primarily in one plane, like the opening and closing of a door. (d) During any movement, it is the muscle that contracts and exerts a pull on the bones, causing them to move.

Question 2

Indicate true (T) or false (F) for the following statements: (a) The movement and locomotion of all 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.
Solution: (a) False. Different animals have vastly different ways of moving and locomoting based on their body structure and environment. (b) False. Bones are generally harder and less flexible than cartilages. (c) False. The bones in our fingers have joints that allow us to bend and move them. (d) True. The forearm consists of two long bones: the humerus (upper arm bone) and the radius and ulna (forearm bones). (e) True. Cockroaches, like many insects, have a hard outer covering called an exoskeleton that supports and protects them.

Question 3

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

Column I

Fish

Ribs

Snail

Cockroach

Upper jaw

Column II

have fins on the body

has an outer skeleton

protect the heart

shows very slow movement

is an immovable joint

can fly in the air

have a streamlined body

Solution: Here is the correct matching:
  • Fish - have fins on the body, have a streamlined body
  • Ribs - protect the heart
  • Snail - shows very slow movement
  • Cockroach - has an outer skeleton, can fly in the air
  • Upper jaw - is an immovable joint

Question 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?
Solution: (a) A ball and socket joint is a type of synovial joint that allows for movement in multiple directions. It is characterized by the rounded head of one bone (the ball) fitting into the hollow socket of another bone. This structure permits a wide range of motion, including flexion, extension, abduction, adduction, rotation, and circumduction. A common example is the joint between the upper arm bone (humerus) and the shoulder blade (scapula). (b) Among the bones of the skull, only the lower jaw bone is movable. The other skull bones are fused together and form immovable joints, which helps to protect the brain. (c) Our elbow cannot move backwards because it is primarily a hinge joint. Similar to the hinge of a door, this type of joint allows for movement in only one direction – forward and backward bending. This structure is essential for actions like bending the arm to bring the hand towards the shoulder.

Common mistakes

  • Confusing the relative hardness of bones and cartilages.
  • Incorrectly identifying movable and immovable joints.
  • Assuming all animals move in the same way.
  • Not understanding that muscles contract to pull bones.

Revision tips

  • Draw diagrams of different joints (hinge, ball and socket) to visualize their structure and movement.
  • Create a table comparing the movement mechanisms of various animals discussed in the chapter.
  • Focus on understanding the function of muscles in relation to bones.
  • Review the definitions of key terms like skeleton, cartilage, and locomotion.

Practice MCQs

Q1. Which type of joint allows movement in all directions?

Q2. What forms the framework of the body, combining bones and cartilages?

Q3. Which part of the body has an outer skeleton?

Q4. What enables the bones to move during locomotion?

Q5. Which of the following is an example of an immovable joint?

Frequently asked questions

What is the main topic of CBSE Class 6 Science Chapter 8?

Chapter 8 of CBSE Class 6 Science focuses on 'Body Movements,' explaining how humans and animals move, the roles of bones, joints, and muscles, and the skeletal system.

What are the different types of joints explained in these NCERT Solutions?

These solutions explain hinge joints (like the elbow), ball and socket joints (like the shoulder), and immovable joints (found in the skull).

How do muscles help in body movement?

Muscles contract and relax, pulling on the bones to cause movement at the joints. This coordinated action allows for locomotion and other body movements.

Why is it important to study body movements in Class 6 Science?

Understanding body movements helps students learn about their own bodies, the importance of the skeletal and muscular systems, and the diversity of movement in the animal kingdom.

Are the solutions provided for Chapter 8 suitable for exam preparation?

Yes, these NCERT Solutions offer clear, step-by-step answers and explanations that are ideal for revising the concepts and practicing problem-solving for exams.

Important links

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