Posted by In Class 6 Science Chapter 5, titled “Body Movements,” students learn about the various types of movements our body can perform, the structure of our skeleton, and the role of joints in enabling these movements. This chapter provides essential insights into the human body’s ability to move and perform different activities
Table of Contents
RBSE Solutions for Class 6 Science Chapter 5 Exercise Questions
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 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.
2. Indicate true (T) and false (F) among the following sentences.
(a) The movement and locomotion of all animals are exactly the same. ( )
(b) The cartilages are harder than bones. ( )
(c) The finger bones do not have joints. ( )
(d) The forearm has two bones. ( )
(e) Cockroaches have an outer skeleton. ( )
Solution:
a) False
b) False
c) False
d) True
e) True
3. Match the items in Column I with one or more items of Column II.
Solution:
| 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 |
Solution:
| Column I | Column II |
| Upper jaw | Is an immovable joint |
| Fish | Have fins on the body, have a streamlined body |
| Ribs | Protect the heart |
| Snail | Has an outer skeleton andShows very slow movement |
| Cockroach | Has an outer skeleton andCan fly in the air |
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) The rounded end of one bone fits into the cavity (hollow space) of the other bone. Such a joint allows movements in all directions, which is called a ball and socket joint.
b) Lower jaw
c) Our elbow cannot move backwards because it has hinge joints which only allow back-and forth-movement.
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Key Topics Covered in Chapter 5: Body Movements
- The Human Skeleton
- The human skeleton is the framework that supports the body. It consists of bones, which are connected by joints, and gives structure to the body.
- Bones: The human body has 206 bones, which can be classified into two main categories:
- Axial Skeleton: Includes the skull, spine, and ribs.
- Appendicular Skeleton: Includes the limbs and the girdles that connect them to the body.
- Types of Joints
- Joints are the areas where two or more bones meet. There are different types of joints based on their structure and the movement they allow.
- Fixed Joints: These joints do not allow any movement (e.g., joints in the skull).
- Hinge Joints: These joints allow movement in one direction, like a door hinge (e.g., knee and elbow joints).
- Ball and Socket Joints: These joints allow movement in all directions (e.g., shoulder and hip joints).
- Pivot Joints: These joints allow rotational movement (e.g., joint between the first and second vertebrae in the neck).
- Gliding Joints: These joints allow bones to slide over each other (e.g., joints between the bones of the wrist and ankle).
- Joints are the areas where two or more bones meet. There are different types of joints based on their structure and the movement they allow.
- Types of Movements
- Voluntary Movements: Movements that are consciously controlled by the brain, such as walking, writing, and talking.
- Involuntary Movements: Movements that are not consciously controlled, such as the heartbeat and digestion.
- The Muscular System
- Muscles work together with bones to produce movement. Muscles are attached to bones by tendons, and they contract and relax to move the bones.
- Types of Muscles:
- Voluntary Muscles: Muscles under our control (e.g., muscles in the arms and legs).
- Involuntary Muscles: Muscles that work automatically (e.g., heart muscles, digestive muscles).
- Cardiac Muscles: Muscles found only in the heart that contract and relax to pump blood.
- Types of Muscles:
- Muscles work together with bones to produce movement. Muscles are attached to bones by tendons, and they contract and relax to move the bones.
- Movement in Other Animals
- In addition to humans, animals also perform various types of movements. For example, some animals have specialized limbs for flying, swimming, or walking, and each movement is controlled by muscles and bones in their bodies.
RBSE Class 6 Science Chapter 5 Solutions
Q1. What is the function of the skeleton in our body?
- Answer: The skeleton provides structural support, protects vital organs, helps in movement, stores minerals, and produces blood cells.
Q2. What are joints?
- Answer: Joints are the places where two or more bones meet. They allow for movement and provide flexibility to the body.
Q3. Describe the three types of joints in the human body.
- Answer:
- Fixed Joints: No movement is allowed (e.g., skull joints).
- Hinge Joints: Allow movement in one direction (e.g., knee and elbow joints).
- Ball and Socket Joints: Allow movement in all directions (e.g., shoulder and hip joints).
Q4. What are voluntary and involuntary movements?
- Answer:
- Voluntary Movements are those that we consciously control (e.g., walking, writing).
- Involuntary Movements are automatic movements that happen without our control (e.g., heartbeat, digestion).
Q5. How do muscles help in body movement?
- Answer: Muscles contract and relax to move bones. Tendons attach muscles to bones, and their coordinated action allows the body to perform movements.
FAQs for RBSE Class 6 Science Chapter 5
1. Why are bones important for our body?
- Bones provide the structure and shape to the body, protect internal organs, and allow movement through joints. They also store minerals and produce blood cells.
2. What is the role of the skeletal system in movement?
- The skeletal system, along with muscles, enables movement. Joints connect bones and allow them to move in different directions, while muscles contract and relax to move these bones.
3. What are the types of muscles?
- The three types of muscles are voluntary muscles (under conscious control), involuntary muscles (work automatically), and cardiac muscles (found in the heart).
4. How does a ball and socket joint work?
- A ball and socket joint allows a wide range of movement in all directions, such as rotating or swinging. Examples include the shoulder and hip joints.
5. What is the difference between voluntary and involuntary muscles?
- Voluntary muscles are controlled consciously by the brain (e.g., muscles in the arms). Involuntary muscles function automatically without conscious control (e.g., muscles in the heart and digestive system).
Conclusion
Chapter 5 of RBSE Class 6 Science explores the importance of body movements, including the structure of the human skeleton, types of joints, and the role of muscles in movement. Understanding the various types of joints and muscles is essential for grasping how the body performs different movements. This chapter lays the foundation for further studies in biology and human anatomy.