CBSE Class 6 Science Chapter 8 Body Movement NCERT Solutions
This chapter, "Body Movement," for CBSE Class 6 Science, delves into the fascinating mechanics of how living beings move. The NCERT Solutions provide clear explanations and answers to exercises covering the structure of the human skeleton, the different types of joints like ball-and-socket and hinge joints, and the role of muscles in enabling movement. It also explores the diverse ways animals like fish, birds, and insects move, highlighting adaptations such as fins, wings, and exoskeletons. These solutions break down complex concepts into understandable steps, helping students grasp the fundamental principles of biomechanics and comparative anatomy. They are an excellent resource for exam preparation, offering a comprehensive review of the chapter's key topics and ensuring students can confidently answer questions on body movement and locomotion.
Quick info
| Board | CBSE |
|---|---|
| Class | Class 6 |
| Subject | Science |
| Session | 2026 |
| Language | English |
| Type | NCERT Solutions |
| Chapter | Chapter 8: Body Movement |
Chapter summary
Chapter 8, "Body Movement," of the NCERT Class 6 Science textbook focuses on the skeletal system, joints, and muscles that facilitate movement in humans and animals. The exercises cover identifying different types of joints, understanding the functions of bones and muscles, and comparing the locomotion of various animals. These solutions provide step-by-step answers to reinforce learning about how our bodies and other creatures move.
Learning outcomes
- Understand the role of joints in body movement.
- Identify different types of joints (ball-and-socket, hinge, immovable).
- Explain the function of bones, cartilages, and muscles in locomotion.
- Describe the skeletal structure of the human body.
- Compare the movement mechanisms of different animals.
- Recognize the presence of an exoskeleton in some animals.
Topics covered
Paper topics
- Body Movement
- Joints
- Types of Joints
- Ball and Socket Joint
- Hinge Joint
- Immovable Joints
- Bones
- Cartilage
- Muscles
- Skeleton
- Animal Locomotion
- Exoskeleton
Important topics
- Types of Joints and their Functions
- Role of Muscles in Movement
- Structure and Function of the Skeleton
- Locomotion in Different Animals
- Ball and Socket vs. Hinge Joints
PDF preview
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Questions and Solutions
Question 1
(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.
The blanks are filled as follows:
(a) Joints of the bones are crucial for enabling the movement of the body. They allow different parts of the body to bend and move relative to each other.
(b) The structural framework of the body, which provides support and shape, is formed by a combination of bones and cartilages. This framework is called the skeleton.
(c) The joint located at the elbow, which allows for bending and straightening of the arm, is a hinge joint. This type of joint permits movement primarily in one plane.
(d) During any physical movement, it is the muscle that contracts. This contraction generates the force needed to pull the bones, thereby causing the limb or body part to move.
Question 2
(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.
Here are the correct true (T) or false (F) indications for each statement:
(a) The movement and locomotion of all animals is exactly the same. (F) - Different animals have evolved diverse methods of movement suited to their environment and needs.
(b) The cartilages are harder than bones. (F) - Cartilage is generally softer and more flexible than bone.
(c) The finger bones do not have joints. (F) - The fingers are made up of several small bones (phalanges) connected by joints, allowing for dexterity.
(d) The fore arm has two bones. (T) - The forearm consists of two long bones: the radius and the ulna.
(e) Cockroaches have an outer skeleton. (T) - Cockroaches, like many insects, have a hard exoskeleton that provides support and protection.
Question 3
Column I
Fish
Snail
Cockroach
Ribs
Upper jaw
Column II
have fins on the body
has an outer skeleton
can fly in the air
shows very slow movement
protect the heart
have a streamlined body
is an immovable joint
Here is the correct matching of items from Column I with Column II:
- Fish matches with 'have fins on the body' and 'have a streamlined body'.
- Snail matches with 'shows very slow movement'.
- Cockroach matches with 'has an outer skeleton' and 'can fly in the air'.
- Ribs match with 'protect the heart'.
- Upper jaw matches with 'is an immovable joint'.
Question 4
(a) What is a ball and socket joint?
(b) Which of the skull bones are movable?
(c) Why can our elbow not move backwards?
(a) A ball and socket joint is a type of synovial joint that allows for the greatest range of motion. It is characterized by the rounded head of one bone (the ball) fitting into the hollow socket of another bone. This structure permits movement in multiple directions, including forward, backward, sideways, and rotation. A prime 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 (mandible) is movable. The other bones of the skull are fused together and are immovable, forming a protective case for 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 is designed to allow movement in only one direction – forward and backward bending. This structure is crucial for actions like bending the arm to bring the hand towards the shoulder, but it prevents hyperextension backwards.
Common mistakes
- Confusing the hardness of cartilage with bones.
- Incorrectly stating that finger bones lack joints.
- Misidentifying the type of joint at the elbow.
- Assuming all animals move in the same way.
Revision tips
- Draw diagrams of different joints mentioned in the chapter.
- Create a table comparing the movement of various animals.
- Practice identifying true/false statements about body movement.
- Review the functions of bones, muscles, and cartilages.
Practice MCQs
Q1. What is the primary function of joints in the human body?
Explanation: Joints are crucial points where bones meet, allowing for a wide range of motion and facilitating the overall movement of the body.
Q2. Which type of joint allows movement in all directions?
Explanation: A ball and socket joint, like the one in the shoulder, has a rounded bone end fitting into a cavity, enabling movement in multiple directions.
Q3. What pulls the bones during movement?
Explanation: Muscles contract and relax, exerting force that pulls on the bones via tendons, which is essential for all types of body movement.
Q4. Which of the following animals has an outer skeleton?
Explanation: Cockroaches possess an exoskeleton, a hard outer covering that provides support and protection, unlike the internal skeleton of humans or fish.
Q5. The ribs in the chest cavity primarily serve to:
Explanation: The rib cage forms a protective structure around vital organs like the heart and lungs, safeguarding them from injury.
Frequently asked questions
What are the main components involved in body movement?
Body movement is primarily facilitated by the coordinated action of bones, joints, and muscles. Bones provide the structure, joints allow for flexibility and articulation between bones, and muscles contract to pull the bones, creating motion.
Can you explain the different types of joints covered in this chapter?
This chapter discusses ball and socket joints (allowing movement in all directions, e.g., shoulder), hinge joints (allowing back and forth movement, e.g., elbow), and immovable joints (which do not allow movement, e.g., skull bones except the lower jaw).
Why is it important to study body movement?
Understanding body movement helps us appreciate the complexity of our own bodies and the diverse adaptations in animals. It's fundamental to biology and physical education, explaining how life interacts with its environment.
How do these NCERT Solutions help students?
These solutions provide clear, step-by-step answers to the textbook questions, helping students understand concepts like joints, muscles, and animal locomotion. They serve as a valuable tool for revision and exam preparation.
What is an exoskeleton?
An exoskeleton is a rigid outer covering that supports and protects the body of certain animals, such as insects like cockroaches. It is different from an endoskeleton, which is an internal framework like that found in humans.
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